[runtime] Use mono_restore_context () to reduce code duplication in the back ends.
[mono.git] / mono / mini / method-to-ir.c
index 51b5e52937d2184c2c2cc76757257756d05190ad..97f053511f0b384036c715ecdc94a624175b84d7 100644 (file)
@@ -130,7 +130,7 @@ static int stind_to_store_membase (int opcode);
 int mono_op_to_op_imm (int opcode);
 int mono_op_to_op_imm_noemul (int opcode);
 
-MonoInst* mono_emit_native_call (MonoCompile *cfg, gconstpointer func, MonoMethodSignature *sig, MonoInst **args);
+MONO_API MonoInst* mono_emit_native_call (MonoCompile *cfg, gconstpointer func, MonoMethodSignature *sig, MonoInst **args);
 
 /* helper methods signatures */
 static MonoMethodSignature *helper_sig_class_init_trampoline = NULL;
@@ -1916,6 +1916,10 @@ handle_enum:
        case MONO_TYPE_GENERICINST:
                type = &type->data.generic_class->container_class->byval_arg;
                goto handle_enum;
+       case MONO_TYPE_VAR:
+       case MONO_TYPE_MVAR:
+               /* gsharedvt */
+               return calli? OP_VCALL_REG: virt? OP_VCALLVIRT: OP_VCALL;
        default:
                g_error ("unknown type 0x%02x in ret_type_to_call_opcode", type->type);
        }
@@ -2126,7 +2130,12 @@ handle_enum:
                case MONO_TYPE_GENERICINST:
                        simple_type = &simple_type->data.generic_class->container_class->byval_arg;
                        goto handle_enum;
-
+               case MONO_TYPE_VAR:
+               case MONO_TYPE_MVAR:
+                       /* gsharedvt */
+                       if (args [i]->type != STACK_VTYPE)
+                               return 1;
+                       continue;
                default:
                        g_error ("unknown type 0x%02x in check_call_signature",
                                 simple_type->type);
@@ -2263,12 +2272,72 @@ mini_method_check_context_used (MonoCompile *cfg, MonoMethod *method)
                return 0;
 }
 
+/*
+ * check_method_sharing:
+ *
+ *   Check whenever the vtable or an mrgctx needs to be passed when calling CMETHOD.
+ */
+static void
+check_method_sharing (MonoCompile *cfg, MonoMethod *cmethod, gboolean *out_pass_vtable, gboolean *out_pass_mrgctx)
+{
+       gboolean pass_vtable = FALSE;
+       gboolean pass_mrgctx = FALSE;
+
+       if (((cmethod->flags & METHOD_ATTRIBUTE_STATIC) || cmethod->klass->valuetype) &&
+               (cmethod->klass->generic_class || cmethod->klass->generic_container)) {
+               gboolean sharable = FALSE;
+
+               if (mono_method_is_generic_sharable (cmethod, TRUE)) {
+                       sharable = TRUE;
+               } else {
+                       gboolean sharing_enabled = mono_class_generic_sharing_enabled (cmethod->klass);
+                       MonoGenericContext *context = mini_class_get_context (cmethod->klass);
+                       gboolean context_sharable = mono_generic_context_is_sharable (context, TRUE);
+
+                       sharable = sharing_enabled && context_sharable;
+               }
+
+               /*
+                * Pass vtable iff target method might
+                * be shared, which means that sharing
+                * is enabled for its class and its
+                * context is sharable (and it's not a
+                * generic method).
+                */
+               if (sharable && !(mini_method_get_context (cmethod) && mini_method_get_context (cmethod)->method_inst))
+                       pass_vtable = TRUE;
+       }
+
+       if (mini_method_get_context (cmethod) &&
+               mini_method_get_context (cmethod)->method_inst) {
+               g_assert (!pass_vtable);
+
+               if (mono_method_is_generic_sharable (cmethod, TRUE)) {
+                       pass_mrgctx = TRUE;
+               } else {
+                       gboolean sharing_enabled = mono_class_generic_sharing_enabled (cmethod->klass);
+                       MonoGenericContext *context = mini_method_get_context (cmethod);
+                       gboolean context_sharable = mono_generic_context_is_sharable (context, TRUE);
+
+                       if (sharing_enabled && context_sharable)
+                               pass_mrgctx = TRUE;
+                       if (cfg->gsharedvt && mini_is_gsharedvt_signature (cfg, mono_method_signature (cmethod)))
+                               pass_mrgctx = TRUE;
+               }
+       }
+
+       if (out_pass_vtable)
+               *out_pass_vtable = pass_vtable;
+       if (out_pass_mrgctx)
+               *out_pass_mrgctx = pass_mrgctx;
+}
+
 inline static MonoCallInst *
 mono_emit_call_args (MonoCompile *cfg, MonoMethodSignature *sig, 
                                         MonoInst **args, int calli, int virtual, int tail, int rgctx, int unbox_trampoline)
 {
        MonoCallInst *call;
-#ifdef MONO_ARCH_SOFT_FLOAT
+#ifdef MONO_ARCH_SOFT_FLOAT_FALLBACK
        int i;
 #endif
 
@@ -2315,7 +2384,7 @@ mono_emit_call_args (MonoCompile *cfg, MonoMethodSignature *sig,
        } else if (!MONO_TYPE_IS_VOID (sig->ret))
                call->inst.dreg = alloc_dreg (cfg, call->inst.type);
 
-#ifdef MONO_ARCH_SOFT_FLOAT
+#ifdef MONO_ARCH_SOFT_FLOAT_FALLBACK
        if (COMPILE_SOFT_FLOAT (cfg)) {
                /* 
                 * If the call has a float argument, we would need to do an r8->r4 conversion using 
@@ -2404,13 +2473,16 @@ mono_emit_calli (MonoCompile *cfg, MonoMethodSignature *sig, MonoInst **args, Mo
        return (MonoInst*)call;
 }
 
+static MonoInst*
+emit_get_gsharedvt_info_klass (MonoCompile *cfg, MonoClass *klass, MonoRgctxInfoType rgctx_type);
+
 static MonoInst*
 emit_get_rgctx_method (MonoCompile *cfg, int context_used, MonoMethod *cmethod, MonoRgctxInfoType rgctx_type);
 static MonoInst*
 emit_get_rgctx_klass (MonoCompile *cfg, int context_used, MonoClass *klass, MonoRgctxInfoType rgctx_type);
 
 static MonoInst*
-mono_emit_method_call_full (MonoCompile *cfg, MonoMethod *method, MonoMethodSignature *sig,
+mono_emit_method_call_full (MonoCompile *cfg, MonoMethod *method, MonoMethodSignature *sig, gboolean tail,
                                                        MonoInst **args, MonoInst *this, MonoInst *imt_arg, MonoInst *rgctx_arg)
 {
 #ifndef DISABLE_REMOTING
@@ -2423,6 +2495,9 @@ mono_emit_method_call_full (MonoCompile *cfg, MonoMethod *method, MonoMethodSign
        int rgctx_reg = 0;
        gboolean need_unbox_trampoline;
 
+       if (!sig)
+               sig = mono_method_signature (method);
+
        if (rgctx_arg) {
                rgctx_reg = mono_alloc_preg (cfg);
                MONO_EMIT_NEW_UNALU (cfg, OP_MOVE, rgctx_reg, rgctx_arg->dreg);
@@ -2457,7 +2532,7 @@ mono_emit_method_call_full (MonoCompile *cfg, MonoMethod *method, MonoMethodSign
 
        need_unbox_trampoline = method->klass == mono_defaults.object_class || (method->klass->flags & TYPE_ATTRIBUTE_INTERFACE);
 
-       call = mono_emit_call_args (cfg, sig, args, FALSE, virtual, FALSE, rgctx_arg ? TRUE : FALSE, need_unbox_trampoline);
+       call = mono_emit_call_args (cfg, sig, args, FALSE, virtual, tail, rgctx_arg ? TRUE : FALSE, need_unbox_trampoline);
 
 #ifndef DISABLE_REMOTING
        if (might_be_remote)
@@ -2467,14 +2542,15 @@ mono_emit_method_call_full (MonoCompile *cfg, MonoMethod *method, MonoMethodSign
                call->method = method;
        call->inst.flags |= MONO_INST_HAS_METHOD;
        call->inst.inst_left = this;
+       call->tail_call = tail;
 
        if (virtual) {
                int vtable_reg, slot_reg, this_reg;
+               int offset;
 
                this_reg = this->dreg;
 
-#ifdef MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
-               if ((method->klass->parent == mono_defaults.multicastdelegate_class) && (!strcmp (method->name, "Invoke"))) {
+               if (ARCH_HAVE_DELEGATE_TRAMPOLINES && (method->klass->parent == mono_defaults.multicastdelegate_class) && !strcmp (method->name, "Invoke")) {
                        MonoInst *dummy_use;
 
                        MONO_EMIT_NULL_CHECK (cfg, this_reg);
@@ -2501,7 +2577,6 @@ mono_emit_method_call_full (MonoCompile *cfg, MonoMethod *method, MonoMethodSign
 
                        return (MonoInst*)call;
                }
-#endif
 
                if ((!cfg->compile_aot || enable_for_aot) && 
                        (!(method->flags & METHOD_ATTRIBUTE_VIRTUAL) || 
@@ -2547,17 +2622,17 @@ mono_emit_method_call_full (MonoCompile *cfg, MonoMethod *method, MonoMethodSign
                                        guint32 imt_slot = mono_method_get_imt_slot (method);
                                        emit_imt_argument (cfg, call, call->method, imt_arg);
                                        slot_reg = vtable_reg;
-                                       call->inst.inst_offset = ((gint32)imt_slot - MONO_IMT_SIZE) * SIZEOF_VOID_P;
+                                       offset = ((gint32)imt_slot - MONO_IMT_SIZE) * SIZEOF_VOID_P;
                                }
 #endif
                                if (slot_reg == -1) {
                                        slot_reg = alloc_preg (cfg);
                                        mini_emit_load_intf_reg_vtable (cfg, slot_reg, vtable_reg, method->klass);
-                                       call->inst.inst_offset = mono_method_get_vtable_index (method) * SIZEOF_VOID_P;
+                                       offset = mono_method_get_vtable_index (method) * SIZEOF_VOID_P;
                                }
                        } else {
                                slot_reg = vtable_reg;
-                               call->inst.inst_offset = G_STRUCT_OFFSET (MonoVTable, vtable) +
+                               offset = G_STRUCT_OFFSET (MonoVTable, vtable) +
                                        ((mono_method_get_vtable_index (method)) * (SIZEOF_VOID_P));
 #ifdef MONO_ARCH_HAVE_IMT
                                if (imt_arg) {
@@ -2568,6 +2643,7 @@ mono_emit_method_call_full (MonoCompile *cfg, MonoMethod *method, MonoMethodSign
                        }
 
                        call->inst.sreg1 = slot_reg;
+                       call->inst.inst_offset = offset;
                        call->virtual = TRUE;
                }
        }
@@ -2583,7 +2659,7 @@ mono_emit_method_call_full (MonoCompile *cfg, MonoMethod *method, MonoMethodSign
 MonoInst*
 mono_emit_method_call (MonoCompile *cfg, MonoMethod *method, MonoInst **args, MonoInst *this)
 {
-       return mono_emit_method_call_full (cfg, method, mono_method_signature (method), args, this, NULL, NULL);
+       return mono_emit_method_call_full (cfg, method, mono_method_signature (method), FALSE, args, this, NULL, NULL);
 }
 
 MonoInst*
@@ -2714,7 +2790,7 @@ create_write_barrier_bitmap (MonoCompile *cfg, MonoClass *klass, unsigned *wb_bi
 }
 
 static void
-emit_write_barrier (MonoCompile *cfg, MonoInst *ptr, MonoInst *value, int value_reg)
+emit_write_barrier (MonoCompile *cfg, MonoInst *ptr, MonoInst *value)
 {
        int card_table_shift_bits;
        gpointer card_table_mask;
@@ -2740,10 +2816,7 @@ emit_write_barrier (MonoCompile *cfg, MonoInst *ptr, MonoInst *value, int value_
 
                MONO_INST_NEW (cfg, wbarrier, OP_CARD_TABLE_WBARRIER);
                wbarrier->sreg1 = ptr->dreg;
-               if (value)
-                       wbarrier->sreg2 = value->dreg;
-               else
-                       wbarrier->sreg2 = value_reg;
+               wbarrier->sreg2 = value->dreg;
                MONO_ADD_INS (cfg->cbb, wbarrier);
        } else if (card_table) {
                int offset_reg = alloc_preg (cfg);
@@ -2773,13 +2846,7 @@ emit_write_barrier (MonoCompile *cfg, MonoInst *ptr, MonoInst *value, int value_
                mono_emit_method_call (cfg, write_barrier, &ptr, NULL);
        }
 
-       if (value) {
-               EMIT_NEW_DUMMY_USE (cfg, dummy_use, value);
-       } else {
-               MONO_INST_NEW (cfg, dummy_use, OP_DUMMY_USE);
-               dummy_use->sreg1 = value_reg;
-               MONO_ADD_INS (cfg->cbb, dummy_use);
-       }
+       EMIT_NEW_DUMMY_USE (cfg, dummy_use, value);
 }
 
 static gboolean
@@ -2824,11 +2891,17 @@ mono_emit_wb_aware_memcpy (MonoCompile *cfg, MonoClass *klass, MonoInst *iargs[4
        EMIT_NEW_UNALU (cfg, iargs [0], OP_MOVE, dest_ptr_reg, destreg);
 
        while (size >= SIZEOF_VOID_P) {
-               MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOAD_MEMBASE, tmp_reg, srcreg, offset);
+               MonoInst *load_inst;
+               MONO_INST_NEW (cfg, load_inst, OP_LOAD_MEMBASE);
+               load_inst->dreg = tmp_reg;
+               load_inst->inst_basereg = srcreg;
+               load_inst->inst_offset = offset;
+               MONO_ADD_INS (cfg->cbb, load_inst);
+
                MONO_EMIT_NEW_STORE_MEMBASE (cfg, OP_STOREP_MEMBASE_REG, dest_ptr_reg, 0, tmp_reg);
 
                if (need_wb & 0x1)
-                       emit_write_barrier (cfg, iargs [0], NULL, tmp_reg);
+                       emit_write_barrier (cfg, iargs [0], load_inst);
 
                offset += SIZEOF_VOID_P;
                size -= SIZEOF_VOID_P;
@@ -2878,6 +2951,7 @@ mini_emit_stobj (MonoCompile *cfg, MonoInst *dest, MonoInst *src, MonoClass *kla
        guint32 align = 0;
        MonoMethod *memcpy_method;
        MonoInst *size_ins = NULL;
+       MonoInst *memcpy_ins = NULL;
 
        g_assert (klass);
        /*
@@ -2888,7 +2962,8 @@ mini_emit_stobj (MonoCompile *cfg, MonoInst *dest, MonoInst *src, MonoClass *kla
        if (mini_is_gsharedvt_klass (cfg, klass)) {
                g_assert (!native);
                context_used = mini_class_check_context_used (cfg, klass);
-               size_ins = emit_get_rgctx_klass (cfg, context_used, klass, MONO_RGCTX_INFO_VALUE_SIZE);
+               size_ins = emit_get_gsharedvt_info_klass (cfg, klass, MONO_RGCTX_INFO_VALUE_SIZE);
+               memcpy_ins = emit_get_gsharedvt_info_klass (cfg, klass, MONO_RGCTX_INFO_MEMCPY);
        }
 
        if (native)
@@ -2922,7 +2997,10 @@ mini_emit_stobj (MonoCompile *cfg, MonoInst *dest, MonoInst *src, MonoClass *kla
                                }
                        }
 
-                       mono_emit_jit_icall (cfg, mono_value_copy, iargs);
+                       if (size_ins)
+                               mono_emit_jit_icall (cfg, mono_gsharedvt_value_copy, iargs);
+                       else
+                               mono_emit_jit_icall (cfg, mono_value_copy, iargs);
                        return;
                }
        }
@@ -2939,7 +3017,10 @@ mini_emit_stobj (MonoCompile *cfg, MonoInst *dest, MonoInst *src, MonoClass *kla
                        EMIT_NEW_ICONST (cfg, iargs [2], n);
                
                memcpy_method = get_memcpy_method ();
-               mono_emit_method_call (cfg, memcpy_method, iargs, NULL);
+               if (memcpy_ins)
+                       mono_emit_calli (cfg, mono_method_signature (memcpy_method), iargs, memcpy_ins, NULL, NULL);
+               else
+                       mono_emit_method_call (cfg, memcpy_method, iargs, NULL);
        }
 }
 
@@ -2963,29 +3044,35 @@ mini_emit_initobj (MonoCompile *cfg, MonoInst *dest, const guchar *ip, MonoClass
        guint32 align;
        MonoMethod *memset_method;
        MonoInst *size_ins = NULL;
+       MonoInst *bzero_ins = NULL;
+       static MonoMethod *bzero_method;
 
        /* FIXME: Optimize this for the case when dest is an LDADDR */
 
        mono_class_init (klass);
        if (mini_is_gsharedvt_klass (cfg, klass)) {
                context_used = mini_class_check_context_used (cfg, klass);
-               size_ins = emit_get_rgctx_klass (cfg, context_used, klass, MONO_RGCTX_INFO_VALUE_SIZE);
-               n = -1;
-       } else {
-               n = mono_class_value_size (klass, &align);
+               size_ins = emit_get_gsharedvt_info_klass (cfg, klass, MONO_RGCTX_INFO_VALUE_SIZE);
+               bzero_ins = emit_get_gsharedvt_info_klass (cfg, klass, MONO_RGCTX_INFO_BZERO);
+               if (!bzero_method)
+                       bzero_method = mono_class_get_method_from_name (mono_defaults.string_class, "bzero_aligned_1", 2);
+               g_assert (bzero_method);
+               iargs [0] = dest;
+               iargs [1] = size_ins;
+               mono_emit_calli (cfg, mono_method_signature (bzero_method), iargs, bzero_ins, NULL, NULL);
+               return;
        }
 
-       if (!size_ins && n <= sizeof (gpointer) * 5) {
+       n = mono_class_value_size (klass, &align);
+
+       if (n <= sizeof (gpointer) * 5) {
                mini_emit_memset (cfg, dest->dreg, 0, n, 0, align);
        }
        else {
                memset_method = get_memset_method ();
                iargs [0] = dest;
                EMIT_NEW_ICONST (cfg, iargs [1], 0);
-               if (size_ins)
-                       iargs [2] = size_ins;
-               else
-                       EMIT_NEW_ICONST (cfg, iargs [2], n);
+               EMIT_NEW_ICONST (cfg, iargs [2], n);
                mono_emit_method_call (cfg, memset_method, iargs, NULL);
        }
 }
@@ -3098,6 +3185,20 @@ emit_get_rgctx_gsharedvt_call (MonoCompile *cfg, int context_used,
        return emit_rgctx_fetch (cfg, rgctx, entry);
 }
 
+
+static MonoInst*
+emit_get_rgctx_gsharedvt_method (MonoCompile *cfg, int context_used,
+                                                                MonoMethod *cmethod, MonoGSharedVtMethodInfo *info)
+{
+       MonoJumpInfoRgctxEntry *entry;
+       MonoInst *rgctx;
+
+       entry = mono_patch_info_rgctx_entry_new (cfg->mempool, cfg->current_method, context_used & MONO_GENERIC_CONTEXT_USED_METHOD, MONO_PATCH_INFO_GSHAREDVT_METHOD, info, MONO_RGCTX_INFO_METHOD_GSHAREDVT_INFO);
+       rgctx = emit_get_rgctx (cfg, cfg->current_method, context_used);
+
+       return emit_rgctx_fetch (cfg, rgctx, entry);
+}
+
 /*
  * emit_get_rgctx_method:
  *
@@ -3139,6 +3240,58 @@ emit_get_rgctx_field (MonoCompile *cfg, int context_used,
        return emit_rgctx_fetch (cfg, rgctx, entry);
 }
 
+static int
+get_gsharedvt_info_slot (MonoCompile *cfg, gpointer data, MonoRgctxInfoType rgctx_type)
+{
+       MonoGSharedVtMethodInfo *info = cfg->gsharedvt_info;
+       MonoRuntimeGenericContextInfoTemplate *template;
+       int i, idx;
+
+       g_assert (info);
+
+       for (i = 0; i < info->entries->len; ++i) {
+               MonoRuntimeGenericContextInfoTemplate *otemplate = g_ptr_array_index (info->entries, i);
+
+               if (otemplate->info_type == rgctx_type && otemplate->data == data && rgctx_type != MONO_RGCTX_INFO_LOCAL_OFFSET)
+                       return i;
+       }
+
+       template = mono_mempool_alloc0 (cfg->mempool, sizeof (MonoRuntimeGenericContextInfoTemplate));
+       template->info_type = rgctx_type;
+       template->data = data;
+
+       idx = info->entries->len;
+
+       g_ptr_array_add (info->entries, template);
+
+       return idx;
+}
+
+/*
+ * emit_get_gsharedvt_info:
+ *
+ *   This is similar to emit_get_rgctx_.., but loads the data from the gsharedvt info var instead of calling an rgctx fetch trampoline.
+ */
+static MonoInst*
+emit_get_gsharedvt_info (MonoCompile *cfg, gpointer data, MonoRgctxInfoType rgctx_type)
+{
+       MonoInst *ins;
+       int idx, dreg;
+
+       idx = get_gsharedvt_info_slot (cfg, data, rgctx_type);
+       /* Load info->entries [idx] */
+       dreg = alloc_preg (cfg);
+       EMIT_NEW_LOAD_MEMBASE (cfg, ins, OP_LOAD_MEMBASE, dreg, cfg->gsharedvt_info_var->dreg, G_STRUCT_OFFSET (MonoGSharedVtMethodRuntimeInfo, entries) + (idx * sizeof (gpointer)));
+
+       return ins;
+}
+
+static MonoInst*
+emit_get_gsharedvt_info_klass (MonoCompile *cfg, MonoClass *klass, MonoRgctxInfoType rgctx_type)
+{
+       return emit_get_gsharedvt_info (cfg, &klass->byval_arg, rgctx_type);
+}
+
 /*
  * On return the caller must check @klass for load errors.
  */
@@ -3175,25 +3328,36 @@ emit_generic_class_init (MonoCompile *cfg, MonoClass *klass)
 }
 
 static void
-emit_seq_point (MonoCompile *cfg, MonoMethod *method, guint8* ip, gboolean intr_loc)
+emit_seq_point (MonoCompile *cfg, MonoMethod *method, guint8* ip, gboolean intr_loc, gboolean nonempty_stack)
 {
        MonoInst *ins;
 
        if (cfg->gen_seq_points && cfg->method == method) {
                NEW_SEQ_POINT (cfg, ins, ip - cfg->header->code, intr_loc);
+               if (nonempty_stack)
+                       ins->flags |= MONO_INST_NONEMPTY_STACK;
                MONO_ADD_INS (cfg->cbb, ins);
        }
 }
 
 static void
-save_cast_details (MonoCompile *cfg, MonoClass *klass, int obj_reg)
+save_cast_details (MonoCompile *cfg, MonoClass *klass, int obj_reg, gboolean null_check, MonoBasicBlock **out_bblock)
 {
        if (mini_get_debug_options ()->better_cast_details) {
                int to_klass_reg = alloc_preg (cfg);
                int vtable_reg = alloc_preg (cfg);
                int klass_reg = alloc_preg (cfg);
-               MonoInst *tls_get = mono_get_jit_tls_intrinsic (cfg);
+               MonoBasicBlock *is_null_bb = NULL;
+               MonoInst *tls_get;
+
+               if (null_check) {
+                       NEW_BBLOCK (cfg, is_null_bb);
+
+                       MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, obj_reg, 0);
+                       MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBEQ, is_null_bb);
+               }
 
+               tls_get = mono_get_jit_tls_intrinsic (cfg);
                if (!tls_get) {
                        fprintf (stderr, "error: --debug=casts not supported on this platform.\n.");
                        exit (1);
@@ -3206,6 +3370,12 @@ save_cast_details (MonoCompile *cfg, MonoClass *klass, int obj_reg)
                MONO_EMIT_NEW_STORE_MEMBASE (cfg, OP_STORE_MEMBASE_REG, tls_get->dreg, G_STRUCT_OFFSET (MonoJitTlsData, class_cast_from), klass_reg);
                MONO_EMIT_NEW_PCONST (cfg, to_klass_reg, klass);
                MONO_EMIT_NEW_STORE_MEMBASE (cfg, OP_STORE_MEMBASE_REG, tls_get->dreg, G_STRUCT_OFFSET (MonoJitTlsData, class_cast_to), to_klass_reg);
+
+               if (null_check) {
+                       MONO_START_BB (cfg, is_null_bb);
+                       if (out_bblock)
+                               *out_bblock = cfg->cbb;
+               }
        }
 }
 
@@ -3233,7 +3403,7 @@ mini_emit_check_array_type (MonoCompile *cfg, MonoInst *obj, MonoClass *array_cl
 
        context_used = mini_class_check_context_used (cfg, array_class);
 
-       save_cast_details (cfg, array_class, obj->dreg);
+       save_cast_details (cfg, array_class, obj->dreg, FALSE, NULL);
 
        MONO_EMIT_NEW_LOAD_MEMBASE_FAULT (cfg, vtable_reg, obj->dreg, G_STRUCT_OFFSET (MonoObject, vtable));
 
@@ -3297,7 +3467,20 @@ handle_unbox_nullable (MonoCompile* cfg, MonoInst* val, MonoClass* klass, int co
 
                return mono_emit_calli (cfg, mono_method_signature (method), &val, addr, NULL, rgctx);
        } else {
-               return mono_emit_method_call (cfg, method, &val, NULL);
+               gboolean pass_vtable, pass_mrgctx;
+               MonoInst *rgctx_arg = NULL;
+
+               check_method_sharing (cfg, method, &pass_vtable, &pass_mrgctx);
+               g_assert (!pass_mrgctx);
+
+               if (pass_vtable) {
+                       MonoVTable *vtable = mono_class_vtable (cfg->domain, method->klass);
+
+                       g_assert (vtable);
+                       EMIT_NEW_VTABLECONST (cfg, rgctx_arg, vtable);
+               }
+
+               return mono_emit_method_call_full (cfg, method, NULL, FALSE, &val, NULL, NULL, rgctx_arg);
        }
 }
 
@@ -3337,7 +3520,7 @@ handle_unbox (MonoCompile *cfg, MonoClass *klass, MonoInst **sp, int context_use
                MONO_EMIT_NEW_BIALU (cfg, OP_COMPARE, -1, eclass_reg, element_class->dreg);
                MONO_EMIT_NEW_COND_EXC (cfg, NE_UN, "InvalidCastException");
        } else {
-               save_cast_details (cfg, klass->element_class, obj_reg);
+               save_cast_details (cfg, klass->element_class, obj_reg, FALSE, NULL);
                mini_emit_class_check (cfg, eclass_reg, klass->element_class);
                reset_cast_details (cfg);
        }
@@ -3350,6 +3533,89 @@ handle_unbox (MonoCompile *cfg, MonoClass *klass, MonoInst **sp, int context_use
        return add;
 }
 
+static MonoInst*
+handle_unbox_gsharedvt (MonoCompile *cfg, MonoClass *klass, MonoInst *obj, MonoBasicBlock **out_cbb)
+{
+       MonoInst *addr, *klass_inst, *is_ref, *args[16];
+       MonoBasicBlock *is_ref_bb, *is_nullable_bb, *end_bb;
+       MonoInst *ins;
+       int dreg, addr_reg;
+
+       klass_inst = emit_get_gsharedvt_info_klass (cfg, klass, MONO_RGCTX_INFO_KLASS);
+
+       /* obj */
+       args [0] = obj;
+
+       /* klass */
+       args [1] = klass_inst;
+
+       /* CASTCLASS */
+       obj = mono_emit_jit_icall (cfg, mono_object_castclass_unbox, args);
+
+       NEW_BBLOCK (cfg, is_ref_bb);
+       NEW_BBLOCK (cfg, is_nullable_bb);
+       NEW_BBLOCK (cfg, end_bb);
+       is_ref = emit_get_gsharedvt_info_klass (cfg, klass, MONO_RGCTX_INFO_CLASS_BOX_TYPE);
+       MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, is_ref->dreg, 1);
+       MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_IBEQ, is_ref_bb);
+
+       MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, is_ref->dreg, 2);
+       MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_IBEQ, is_nullable_bb);
+
+       /* This will contain either the address of the unboxed vtype, or an address of the temporary where the ref is stored */
+       addr_reg = alloc_dreg (cfg, STACK_MP);
+
+       /* Non-ref case */
+       /* UNBOX */
+       NEW_BIALU_IMM (cfg, addr, OP_ADD_IMM, addr_reg, obj->dreg, sizeof (MonoObject));
+       MONO_ADD_INS (cfg->cbb, addr);
+
+       MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, end_bb);
+
+       /* Ref case */
+       MONO_START_BB (cfg, is_ref_bb);
+
+       /* Save the ref to a temporary */
+       dreg = alloc_ireg (cfg);
+       EMIT_NEW_VARLOADA_VREG (cfg, addr, dreg, &klass->byval_arg);
+       addr->dreg = addr_reg;
+       MONO_EMIT_NEW_STORE_MEMBASE (cfg, OP_STORE_MEMBASE_REG, addr->dreg, 0, obj->dreg);
+       MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, end_bb);
+
+       /* Nullable case */
+       MONO_START_BB (cfg, is_nullable_bb);
+
+       {
+               MonoInst *addr = emit_get_gsharedvt_info_klass (cfg, klass, MONO_RGCTX_INFO_NULLABLE_CLASS_UNBOX);
+               MonoInst *unbox_call;
+               MonoMethodSignature *unbox_sig;
+               MonoInst *var;
+
+               var = mono_compile_create_var (cfg, &klass->byval_arg, OP_LOCAL);
+
+               unbox_sig = mono_mempool_alloc0 (cfg->mempool, MONO_SIZEOF_METHOD_SIGNATURE + (1 * sizeof (MonoType *)));
+               unbox_sig->ret = &klass->byval_arg;
+               unbox_sig->param_count = 1;
+               unbox_sig->params [0] = &mono_defaults.object_class->byval_arg;
+               unbox_call = mono_emit_calli (cfg, unbox_sig, &obj, addr, NULL, NULL);
+
+               EMIT_NEW_VARLOADA_VREG (cfg, addr, unbox_call->dreg, &klass->byval_arg);
+               addr->dreg = addr_reg;
+       }
+
+       MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, end_bb);
+
+       /* End */
+       MONO_START_BB (cfg, end_bb);
+
+       /* LDOBJ */
+       EMIT_NEW_LOAD_MEMBASE_TYPE (cfg, ins, &klass->byval_arg, addr_reg, 0);
+
+       *out_cbb = cfg->cbb;
+
+       return ins;
+}
+
 /*
  * Returns NULL and set the cfg exception on error.
  */
@@ -3364,13 +3630,7 @@ handle_alloc (MonoCompile *cfg, MonoClass *klass, gboolean for_box, int context_
                int rgctx_info;
                MonoInst *iargs [2];
 
-               /*
-                 FIXME: we cannot get managed_alloc here because we can't get
-                 the class's vtable (because it's not a closed class)
-
-                 MonoVTable *vtable = mono_class_vtable (cfg->domain, klass);
-                 MonoMethod *managed_alloc = mono_gc_get_managed_allocator (vtable, for_box);
-               */
+               MonoMethod *managed_alloc = mono_gc_get_managed_allocator (klass, for_box);
 
                if (cfg->opt & MONO_OPT_SHARED)
                        rgctx_info = MONO_RGCTX_INFO_KLASS;
@@ -3387,6 +3647,9 @@ handle_alloc (MonoCompile *cfg, MonoClass *klass, gboolean for_box, int context_
                        alloc_ftn = mono_object_new_specific;
                }
 
+               if (managed_alloc && !(cfg->opt & MONO_OPT_SHARED))
+                       return mono_emit_method_call (cfg, managed_alloc, iargs, NULL);
+
                return mono_emit_jit_icall (cfg, alloc_ftn, iargs);
        }
 
@@ -3412,7 +3675,7 @@ handle_alloc (MonoCompile *cfg, MonoClass *klass, gboolean for_box, int context_
                }
 
 #ifndef MONO_CROSS_COMPILE
-               managed_alloc = mono_gc_get_managed_allocator (vtable, for_box);
+               managed_alloc = mono_gc_get_managed_allocator (klass, for_box);
 #endif
 
                if (managed_alloc) {
@@ -3438,10 +3701,12 @@ handle_alloc (MonoCompile *cfg, MonoClass *klass, gboolean for_box, int context_
  * Returns NULL and set the cfg exception on error.
  */    
 static MonoInst*
-handle_box (MonoCompile *cfg, MonoInst *val, MonoClass *klass, int context_used)
+handle_box (MonoCompile *cfg, MonoInst *val, MonoClass *klass, int context_used, MonoBasicBlock **out_cbb)
 {
        MonoInst *alloc, *ins;
 
+       *out_cbb = cfg->cbb;
+
        if (mono_class_is_nullable (klass)) {
                MonoMethod* method = mono_class_get_method_from_name (klass, "Box", 1);
 
@@ -3454,24 +3719,40 @@ handle_box (MonoCompile *cfg, MonoInst *val, MonoClass *klass, int context_used)
 
                        return mono_emit_calli (cfg, mono_method_signature (method), &val, addr, NULL, rgctx);
                } else {
-                       return mono_emit_method_call (cfg, method, &val, NULL);
+                       gboolean pass_vtable, pass_mrgctx;
+                       MonoInst *rgctx_arg = NULL;
+
+                       check_method_sharing (cfg, method, &pass_vtable, &pass_mrgctx);
+                       g_assert (!pass_mrgctx);
+
+                       if (pass_vtable) {
+                               MonoVTable *vtable = mono_class_vtable (cfg->domain, method->klass);
+
+                               g_assert (vtable);
+                               EMIT_NEW_VTABLECONST (cfg, rgctx_arg, vtable);
+                       }
+
+                       return mono_emit_method_call_full (cfg, method, NULL, FALSE, &val, NULL, NULL, rgctx_arg);
                }
        }
 
        if (mini_is_gsharedvt_klass (cfg, klass)) {
-               MonoBasicBlock *is_ref_bb, *end_bb;
+               MonoBasicBlock *is_ref_bb, *is_nullable_bb, *end_bb;
                MonoInst *res, *is_ref, *src_var, *addr;
                int addr_reg, dreg;
 
                dreg = alloc_ireg (cfg);
 
                NEW_BBLOCK (cfg, is_ref_bb);
+               NEW_BBLOCK (cfg, is_nullable_bb);
                NEW_BBLOCK (cfg, end_bb);
-               is_ref = emit_get_rgctx_klass (cfg, context_used, klass,
-                                                                          MONO_RGCTX_INFO_CLASS_IS_REF);
+               is_ref = emit_get_gsharedvt_info_klass (cfg, klass, MONO_RGCTX_INFO_CLASS_BOX_TYPE);
                MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, is_ref->dreg, 1);
                MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_IBEQ, is_ref_bb);
 
+               MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, is_ref->dreg, 2);
+               MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_IBEQ, is_nullable_bb);
+
                /* Non-ref case */
                alloc = handle_alloc (cfg, klass, TRUE, context_used);
                if (!alloc)
@@ -3496,8 +3777,35 @@ handle_box (MonoCompile *cfg, MonoInst *val, MonoClass *klass, int context_used)
                MONO_EMIT_NEW_LOAD_MEMBASE (cfg, dreg, addr->dreg, 0);
                MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, end_bb);
 
+               /* Nullable case */
+               MONO_START_BB (cfg, is_nullable_bb);
+
+               {
+                       MonoInst *addr = emit_get_gsharedvt_info_klass (cfg, klass,
+                                                                                                       MONO_RGCTX_INFO_NULLABLE_CLASS_BOX);
+                       MonoInst *box_call;
+                       MonoMethodSignature *box_sig;
+
+                       /*
+                        * klass is Nullable<T>, need to call Nullable<T>.Box () using a gsharedvt signature, but we cannot
+                        * construct that method at JIT time, so have to do things by hand.
+                        */
+                       box_sig = mono_mempool_alloc0 (cfg->mempool, MONO_SIZEOF_METHOD_SIGNATURE + (1 * sizeof (MonoType *)));
+                       box_sig->ret = &mono_defaults.object_class->byval_arg;
+                       box_sig->param_count = 1;
+                       box_sig->params [0] = &klass->byval_arg;
+                       box_call = mono_emit_calli (cfg, box_sig, &val, addr, NULL, NULL);
+                       EMIT_NEW_UNALU (cfg, res, OP_MOVE, dreg, box_call->dreg);
+                       res->type = STACK_OBJ;
+                       res->klass = klass;
+               }
+
+               MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, end_bb);
+
                MONO_START_BB (cfg, end_bb);
 
+               *out_cbb = cfg->cbb;
+
                return res;
        } else {
                alloc = handle_alloc (cfg, klass, TRUE, context_used);
@@ -3555,7 +3863,7 @@ handle_castclass (MonoCompile *cfg, MonoClass *klass, MonoInst *src, int context
        if (context_used) {
                MonoInst *args [3];
 
-               if(mini_class_has_reference_variant_generic_argument (cfg, klass, context_used)) {
+               if(mini_class_has_reference_variant_generic_argument (cfg, klass, context_used) || is_complex_isinst (klass)) {
                        MonoMethod *mono_castclass = mono_marshal_get_castclass_with_cache ();
                        MonoInst *cache_ins;
 
@@ -3574,20 +3882,6 @@ handle_castclass (MonoCompile *cfg, MonoClass *klass, MonoInst *src, int context
                }
 
                klass_inst = emit_get_rgctx_klass (cfg, context_used, klass, MONO_RGCTX_INFO_KLASS);
-
-               if (is_complex_isinst (klass)) {
-                       /* Complex case, handle by an icall */
-
-                       /* obj */
-                       args [0] = src;
-
-                       /* klass */
-                       args [1] = klass_inst;
-
-                       return mono_emit_jit_icall (cfg, mono_object_castclass, args);
-               } else {
-                       /* Simple case, handled by the code below */
-               }
        }
 
        NEW_BBLOCK (cfg, is_null_bb);
@@ -3595,7 +3889,7 @@ handle_castclass (MonoCompile *cfg, MonoClass *klass, MonoInst *src, int context
        MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, obj_reg, 0);
        MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBEQ, is_null_bb);
 
-       save_cast_details (cfg, klass, obj_reg);
+       save_cast_details (cfg, klass, obj_reg, FALSE, NULL);
 
        if (klass->flags & TYPE_ATTRIBUTE_INTERFACE) {
                MONO_EMIT_NEW_LOAD_MEMBASE (cfg, vtable_reg, obj_reg, G_STRUCT_OFFSET (MonoObject, vtable));
@@ -3649,7 +3943,7 @@ handle_isinst (MonoCompile *cfg, MonoClass *klass, MonoInst *src, int context_us
        if (context_used) {
                MonoInst *args [3];
 
-               if(mini_class_has_reference_variant_generic_argument (cfg, klass, context_used)) {
+               if(mini_class_has_reference_variant_generic_argument (cfg, klass, context_used) || is_complex_isinst (klass)) {
                        MonoMethod *mono_isinst = mono_marshal_get_isinst_with_cache ();
                        MonoInst *cache_ins;
 
@@ -3668,20 +3962,6 @@ handle_isinst (MonoCompile *cfg, MonoClass *klass, MonoInst *src, int context_us
                }
 
                klass_inst = emit_get_rgctx_klass (cfg, context_used, klass, MONO_RGCTX_INFO_KLASS);
-
-               if (is_complex_isinst (klass)) {
-                       /* Complex case, handle by an icall */
-
-                       /* obj */
-                       args [0] = src;
-
-                       /* klass */
-                       args [1] = klass_inst;
-
-                       return mono_emit_jit_icall (cfg, mono_object_isinst, args);
-               } else {
-                       /* Simple case, the code below can handle it */
-               }
        }
 
        NEW_BBLOCK (cfg, is_null_bb);
@@ -3919,7 +4199,7 @@ handle_ccastclass (MonoCompile *cfg, MonoClass *klass, MonoInst *src)
        MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, obj_reg, 0);
        MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBEQ, ok_result_bb);
 
-       save_cast_details (cfg, klass, obj_reg);
+       save_cast_details (cfg, klass, obj_reg, FALSE, NULL);
 
        if (klass->flags & TYPE_ATTRIBUTE_INTERFACE) {
 #ifndef DISABLE_REMOTING
@@ -4020,7 +4300,7 @@ handle_delegate_ctor (MonoCompile *cfg, MonoClass *klass, MonoInst *target, Mono
                if (cfg->gen_write_barriers) {
                        dreg = alloc_preg (cfg);
                        EMIT_NEW_BIALU_IMM (cfg, ptr, OP_PADD_IMM, dreg, obj->dreg, G_STRUCT_OFFSET (MonoDelegate, target));
-                       emit_write_barrier (cfg, ptr, target, 0);
+                       emit_write_barrier (cfg, ptr, target);
                }
        }
 
@@ -4030,7 +4310,7 @@ handle_delegate_ctor (MonoCompile *cfg, MonoClass *klass, MonoInst *target, Mono
        if (cfg->gen_write_barriers) {
                dreg = alloc_preg (cfg);
                EMIT_NEW_BIALU_IMM (cfg, ptr, OP_PADD_IMM, dreg, obj->dreg, G_STRUCT_OFFSET (MonoDelegate, method));
-               emit_write_barrier (cfg, ptr, method_ins, 0);
+               emit_write_barrier (cfg, ptr, method_ins);
        }
        /* 
         * To avoid looking up the compiled code belonging to the target method
@@ -4133,7 +4413,7 @@ mono_method_check_inlining (MonoCompile *cfg, MonoMethod *method)
 {
        MonoMethodHeaderSummary header;
        MonoVTable *vtable;
-#ifdef MONO_ARCH_SOFT_FLOAT
+#ifdef MONO_ARCH_SOFT_FLOAT_FALLBACK
        MonoMethodSignature *sig = mono_method_signature (method);
        int i;
 #endif
@@ -4165,8 +4445,8 @@ mono_method_check_inlining (MonoCompile *cfg, MonoMethod *method)
        /* also consider num_locals? */
        /* Do the size check early to avoid creating vtables */
        if (!inline_limit_inited) {
-               if (getenv ("MONO_INLINELIMIT"))
-                       inline_limit = atoi (getenv ("MONO_INLINELIMIT"));
+               if (g_getenv ("MONO_INLINELIMIT"))
+                       inline_limit = atoi (g_getenv ("MONO_INLINELIMIT"));
                else
                        inline_limit = INLINE_LENGTH_LIMIT;
                inline_limit_inited = TRUE;
@@ -4224,31 +4504,36 @@ mono_method_check_inlining (MonoCompile *cfg, MonoMethod *method)
        if (mono_security_method_has_declsec (method))
                return FALSE;
 
-#ifdef MONO_ARCH_SOFT_FLOAT
-       /* FIXME: */
-       if (sig->ret && sig->ret->type == MONO_TYPE_R4)
-               return FALSE;
-       for (i = 0; i < sig->param_count; ++i)
-               if (!sig->params [i]->byref && sig->params [i]->type == MONO_TYPE_R4)
+#ifdef MONO_ARCH_SOFT_FLOAT_FALLBACK
+       if (mono_arch_is_soft_float ()) {
+               /* FIXME: */
+               if (sig->ret && sig->ret->type == MONO_TYPE_R4)
                        return FALSE;
+               for (i = 0; i < sig->param_count; ++i)
+                       if (!sig->params [i]->byref && sig->params [i]->type == MONO_TYPE_R4)
+                               return FALSE;
+       }
 #endif
 
        return TRUE;
 }
 
 static gboolean
-mini_field_access_needs_cctor_run (MonoCompile *cfg, MonoMethod *method, MonoVTable *vtable)
+mini_field_access_needs_cctor_run (MonoCompile *cfg, MonoMethod *method, MonoClass *klass, MonoVTable *vtable)
 {
-       if (vtable->initialized && !cfg->compile_aot)
-               return FALSE;
+       if (!cfg->compile_aot) {
+               g_assert (vtable);
+               if (vtable->initialized)
+                       return FALSE;
+       }
 
-       if (vtable->klass->flags & TYPE_ATTRIBUTE_BEFORE_FIELD_INIT)
+       if (klass->flags & TYPE_ATTRIBUTE_BEFORE_FIELD_INIT)
                return FALSE;
 
-       if (!mono_class_needs_cctor_run (vtable->klass, method))
+       if (!mono_class_needs_cctor_run (klass, method))
                return FALSE;
 
-       if (! (method->flags & METHOD_ATTRIBUTE_STATIC) && (vtable->klass == method->klass))
+       if (! (method->flags & METHOD_ATTRIBUTE_STATIC) && (klass == method->klass))
                /* The initialization is already done before the method is called */
                return FALSE;
 
@@ -4316,7 +4601,7 @@ mini_emit_ldelema_1_ins (MonoCompile *cfg, MonoClass *klass, MonoInst *arr, Mono
                g_assert (cfg->generic_sharing_context);
                context_used = mini_class_check_context_used (cfg, klass);
                g_assert (context_used);
-               rgctx_ins = emit_get_rgctx_klass (cfg, context_used, klass, MONO_RGCTX_INFO_ARRAY_ELEMENT_SIZE);
+               rgctx_ins = emit_get_gsharedvt_info (cfg, &klass->byval_arg, MONO_RGCTX_INFO_ARRAY_ELEMENT_SIZE);
                MONO_EMIT_NEW_BIALU (cfg, OP_IMUL, mult_reg, index2_reg, rgctx_ins->dreg);
        } else {
                MONO_EMIT_NEW_BIALU_IMM (cfg, OP_MUL_IMM, mult_reg, index2_reg, size);
@@ -4493,7 +4778,7 @@ emit_array_generic_access (MonoCompile *cfg, MonoMethodSignature *fsig, MonoInst
                EMIT_NEW_LOAD_MEMBASE_TYPE (cfg, load, &eklass->byval_arg, args [2]->dreg, 0);
                EMIT_NEW_STORE_MEMBASE_TYPE (cfg, store, &eklass->byval_arg, addr->dreg, 0, load->dreg);
                if (mini_type_is_reference (cfg, fsig->params [2]))
-                       emit_write_barrier (cfg, addr, load, -1);
+                       emit_write_barrier (cfg, addr, load);
        } else {
                EMIT_NEW_LOAD_MEMBASE_TYPE (cfg, load, &eklass->byval_arg, addr->dreg, 0);
                EMIT_NEW_STORE_MEMBASE_TYPE (cfg, store, &eklass->byval_arg, args [2]->dreg, 0, load->dreg);
@@ -4553,7 +4838,7 @@ emit_array_store (MonoCompile *cfg, MonoClass *klass, MonoInst **sp, gboolean sa
                        MonoInst *addr = mini_emit_ldelema_1_ins (cfg, klass, sp [0], sp [1], safety_checks);
                        EMIT_NEW_STORE_MEMBASE_TYPE (cfg, ins, &klass->byval_arg, addr->dreg, 0, sp [2]->dreg);
                        if (generic_class_is_reference_type (cfg, klass))
-                               emit_write_barrier (cfg, addr, sp [2], -1);
+                               emit_write_barrier (cfg, addr, sp [2]);
                }
                return ins;
        }
@@ -4769,7 +5054,7 @@ mini_emit_inst_for_method (MonoCompile *cfg, MonoMethod *cmethod, MonoMethodSign
                } else
                        return NULL;
        } else if (cmethod->klass == mono_defaults.array_class) {
-               if (strcmp (cmethod->name + 1, "etGenericValueImpl") == 0)
+               if (!cfg->gsharedvt && strcmp (cmethod->name + 1, "etGenericValueImpl") == 0)
                        return emit_array_generic_access (cfg, fsig, args, *cmethod->name == 'S');
 
 #ifndef MONO_BIG_ARRAYS
@@ -5050,7 +5335,7 @@ mini_emit_inst_for_method (MonoCompile *cfg, MonoMethod *cmethod, MonoMethodSign
                        }
 
                        if (cfg->gen_write_barriers && is_ref)
-                               emit_write_barrier (cfg, args [0], args [1], -1);
+                               emit_write_barrier (cfg, args [0], args [1]);
                }
 #endif /* MONO_ARCH_HAVE_ATOMIC_EXCHANGE */
  
@@ -5084,7 +5369,7 @@ mini_emit_inst_for_method (MonoCompile *cfg, MonoMethod *cmethod, MonoMethodSign
                                /* g_assert_not_reached (); */
                        }
                        if (cfg->gen_write_barriers && is_ref)
-                               emit_write_barrier (cfg, args [0], args [1], -1);
+                               emit_write_barrier (cfg, args [0], args [1]);
                }
 #endif /* MONO_ARCH_HAVE_ATOMIC_CAS */
 
@@ -5119,6 +5404,35 @@ mini_emit_inst_for_method (MonoCompile *cfg, MonoMethod *cmethod, MonoMethodSign
                 * all inputs:
                 * http://everything2.com/?node_id=1051618
                 */
+       } else if ((!strcmp (cmethod->klass->image->assembly->aname.name, "MonoMac") || !strcmp (cmethod->klass->image->assembly->aname.name, "monotouch")) && !strcmp (cmethod->klass->name, "Selector") && !strcmp (cmethod->name, "GetHandle") && cfg->compile_aot && (args [0]->opcode == OP_GOT_ENTRY || args[0]->opcode == OP_AOTCONST)) {
+#ifdef MONO_ARCH_HAVE_OBJC_GET_SELECTOR
+               MonoInst *pi;
+               MonoJumpInfoToken *ji;
+               MonoString *s;
+
+               cfg->disable_llvm = TRUE;
+
+               if (args [0]->opcode == OP_GOT_ENTRY) {
+                       pi = args [0]->inst_p1;
+                       g_assert (pi->opcode == OP_PATCH_INFO);
+                       g_assert ((int)pi->inst_p1 == MONO_PATCH_INFO_LDSTR);
+                       ji = pi->inst_p0;
+               } else {
+                       g_assert ((int)args [0]->inst_p1 == MONO_PATCH_INFO_LDSTR);
+                       ji = args [0]->inst_p0;
+               }
+
+               NULLIFY_INS (args [0]);
+
+               // FIXME: Ugly
+               s = mono_ldstr (cfg->domain, ji->image, mono_metadata_token_index (ji->token));
+               MONO_INST_NEW (cfg, ins, OP_OBJC_GET_SELECTOR);
+               ins->dreg = mono_alloc_ireg (cfg);
+               // FIXME: Leaks
+               ins->inst_p0 = mono_string_to_utf8 (s);
+               MONO_ADD_INS (cfg->cbb, ins);
+               return ins;
+#endif
        }
 
 #ifdef MONO_ARCH_SIMD_INTRINSICS
@@ -5155,7 +5469,7 @@ mini_redirect_call (MonoCompile *cfg, MonoMethod *method,
 
                        g_assert (vtable); /*Should not fail since it System.String*/
 #ifndef MONO_CROSS_COMPILE
-                       managed_alloc = mono_gc_get_managed_allocator (vtable, FALSE);
+                       managed_alloc = mono_gc_get_managed_allocator (method->klass, FALSE);
 #endif
                        if (!managed_alloc)
                                return NULL;
@@ -5201,15 +5515,15 @@ static gboolean
 check_inline_called_method_name_limit (MonoMethod *called_method)
 {
        int strncmp_result;
-       static char *limit = NULL;
+       static const char *limit = NULL;
        
        if (limit == NULL) {
-               char *limit_string = getenv ("MONO_INLINE_CALLED_METHOD_NAME_LIMIT");
+               const char *limit_string = g_getenv ("MONO_INLINE_CALLED_METHOD_NAME_LIMIT");
 
                if (limit_string != NULL)
                        limit = limit_string;
                else
-                       limit = (char *) "";
+                       limit = "";
        }
 
        if (limit [0] != '\0') {
@@ -5231,14 +5545,14 @@ static gboolean
 check_inline_caller_method_name_limit (MonoMethod *caller_method)
 {
        int strncmp_result;
-       static char *limit = NULL;
+       static const char *limit = NULL;
        
        if (limit == NULL) {
-               char *limit_string = getenv ("MONO_INLINE_CALLER_METHOD_NAME_LIMIT");
+               const char *limit_string = g_getenv ("MONO_INLINE_CALLER_METHOD_NAME_LIMIT");
                if (limit_string != NULL) {
                        limit = limit_string;
                } else {
-                       limit = (char *) "";
+                       limit = "";
                }
        }
 
@@ -6249,6 +6563,8 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                if (il_offsets [i] < header->code_size)
                                        mono_bitset_set_fast (seq_point_locs, il_offsets [i]);
                        }
+                       g_free (il_offsets);
+                       g_free (line_numbers);
                }
        }
 
@@ -6516,6 +6832,47 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                link_bblock (cfg, start_bblock, bblock);
        }
 
+       if (cfg->gsharedvt && cfg->method == method) {
+               MonoGSharedVtMethodInfo *info;
+               MonoInst *var, *locals_var;
+               int dreg;
+
+               info = mono_mempool_alloc0 (cfg->mempool, sizeof (MonoGSharedVtMethodInfo));
+               info->method = cfg->method;
+               // FIXME: Free this
+               info->entries = g_ptr_array_new ();
+               cfg->gsharedvt_info = info;
+
+               var = mono_compile_create_var (cfg, &mono_defaults.int_class->byval_arg, OP_LOCAL);
+               /* prevent it from being register allocated */
+               //var->flags |= MONO_INST_INDIRECT;
+               cfg->gsharedvt_info_var = var;
+
+               ins = emit_get_rgctx_gsharedvt_method (cfg, mini_method_check_context_used (cfg, method), method, info);
+               MONO_EMIT_NEW_UNALU (cfg, OP_MOVE, var->dreg, ins->dreg);
+
+               /* Allocate locals */
+               locals_var = mono_compile_create_var (cfg, &mono_defaults.int_class->byval_arg, OP_LOCAL);
+               /* prevent it from being register allocated */
+               //locals_var->flags |= MONO_INST_INDIRECT;
+               cfg->gsharedvt_locals_var = locals_var;
+
+               dreg = alloc_ireg (cfg);
+               MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADI4_MEMBASE, dreg, var->dreg, G_STRUCT_OFFSET (MonoGSharedVtMethodRuntimeInfo, locals_size));
+
+               MONO_INST_NEW (cfg, ins, OP_LOCALLOC);
+               ins->dreg = locals_var->dreg;
+               ins->sreg1 = dreg;
+               MONO_ADD_INS (cfg->cbb, ins);
+               cfg->gsharedvt_locals_var_ins = ins;
+               
+               cfg->flags |= MONO_CFG_HAS_ALLOCA;
+               /*
+               if (init_locals)
+                       ins->flags |= MONO_INST_INIT;
+               */
+       }
+
        /* at this point we know, if security is TRUE, that some code needs to be generated */
        if (security && (cfg->method == method)) {
                MonoInst *args [2];
@@ -6571,6 +6928,8 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                }
        }
 
+       CHECK_CFG_EXCEPTION;
+
        if (header->code_size == 0)
                UNVERIFIED;
 
@@ -6722,6 +7081,8 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                        // FIXME: Enable this
                        //if (!(cfg->cbb->last_ins && cfg->cbb->last_ins->opcode == OP_SEQ_POINT)) {
                        NEW_SEQ_POINT (cfg, ins, ip - header->code, intr_loc);
+                       if (sp != stack_start)
+                               ins->flags |= MONO_INST_NONEMPTY_STACK;
                        MONO_ADD_INS (cfg->cbb, ins);
 
                        if (sym_seq_points)
@@ -7111,6 +7472,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                        MonoInst *vtable_arg = NULL;
                        gboolean check_this = FALSE;
                        gboolean supported_tail_call = FALSE;
+                       gboolean tail_call = FALSE;
                        gboolean need_seq_point = FALSE;
                        guint32 call_opcode = *ip;
                        gboolean emit_widen = TRUE;
@@ -7228,7 +7590,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
 
                                        if (fsig->pinvoke) {
                                                MonoMethod *wrapper = mono_marshal_get_native_wrapper (cmethod,
-                                                       check_for_pending_exc, FALSE);
+                                                       check_for_pending_exc, cfg->compile_aot);
                                                fsig = mono_method_signature (wrapper);
                                        } else if (constrained_call) {
                                                fsig = mono_method_signature (cmethod);
@@ -7239,7 +7601,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
 
                                mono_save_token_info (cfg, image, token, cil_method);
 
-                               if (!MONO_TYPE_IS_VOID (fsig->ret) && !sym_seq_points) {
+                               if (!MONO_TYPE_IS_VOID (fsig->ret)) {
                                        /*
                                         * Need to emit an implicit seq point after every non-void call so single stepping through nested calls like
                                         * foo (bar (), baz ())
@@ -7250,7 +7612,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                         * int i = foo ();
                                         */
                                        /* Special case a few common successor opcodes */
-                                       if (!(ip + 5 < end && ip [5] == CEE_POP))
+                                       if (!(ip + 5 < end && (ip [5] == CEE_POP || ip [5] == CEE_NOP)) && !(seq_point_locs && mono_bitset_test_fast (seq_point_locs, ip + 5 - header->code)))
                                                need_seq_point = TRUE;
                                }
 
@@ -7291,25 +7653,73 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                        /*
                                         * Constrained calls need to behave differently at runtime dependending on whenever the receiver is instantiated as ref type or as a vtype.
                                         */
-                                       /* Special case Object:ToString () as its easy to implement */
-                                       if (cmethod->klass == mono_defaults.object_class && !strcmp (cmethod->name, "ToString")) {
-                                               MonoInst *args [3];
+                                       if ((cmethod->klass != mono_defaults.object_class) && constrained_call->valuetype && cmethod->klass->valuetype) {
+                                               /* The 'Own method' case below */
+                                       } else if (cmethod->klass->image != mono_defaults.corlib && !(cmethod->klass->flags & TYPE_ATTRIBUTE_INTERFACE) && !cmethod->klass->valuetype) {
+                                               /* 'The type parameter is instantiated as a reference type' case below. */
+                                       } else if (((cmethod->klass == mono_defaults.object_class) || (cmethod->klass->flags & TYPE_ATTRIBUTE_INTERFACE) || (!cmethod->klass->valuetype && cmethod->klass->image != mono_defaults.corlib)) &&
+                                                          (MONO_TYPE_IS_VOID (fsig->ret) || MONO_TYPE_IS_PRIMITIVE (fsig->ret) || MONO_TYPE_IS_REFERENCE (fsig->ret) || mini_is_gsharedvt_type (cfg, fsig->ret)) &&
+                                                          (fsig->param_count == 0 || (!fsig->hasthis && fsig->param_count == 1) || (fsig->param_count == 1 && (MONO_TYPE_IS_REFERENCE (fsig->params [0]) || mini_is_gsharedvt_type (cfg, fsig->params [0]))))) {
+                                               MonoInst *args [16];
+
+                                               /*
+                                                * This case handles calls to
+                                                * - object:ToString()/Equals()/GetHashCode(),
+                                                * - System.IComparable<T>:CompareTo()
+                                                * - System.IEquatable<T>:Equals ()
+                                                * plus some simple interface calls enough to support AsyncTaskMethodBuilder.
+                                                */
 
                                                args [0] = sp [0];
-                                               EMIT_NEW_METHODCONST (cfg, args [1], cmethod);
+                                               if (mono_method_check_context_used (cmethod))
+                                                       args [1] = emit_get_rgctx_method (cfg, mono_method_check_context_used (cmethod), cmethod, MONO_RGCTX_INFO_METHOD);
+                                               else
+                                                       EMIT_NEW_METHODCONST (cfg, args [1], cmethod);
                                                args [2] = emit_get_rgctx_klass (cfg, mono_class_check_context_used (constrained_call), constrained_call, MONO_RGCTX_INFO_KLASS);
-                                               ins = mono_emit_jit_icall (cfg, mono_object_tostring_gsharedvt, args);
-                                               goto call_end;
-                                       } else if (cmethod->klass == mono_defaults.object_class && !strcmp (cmethod->name, "GetHashCode")) {
-                                               MonoInst *args [3];
 
-                                               args [0] = sp [0];
-                                               EMIT_NEW_METHODCONST (cfg, args [1], cmethod);
-                                               args [2] = emit_get_rgctx_klass (cfg, mono_class_check_context_used (constrained_call), constrained_call, MONO_RGCTX_INFO_KLASS);
-                                               ins = mono_emit_jit_icall (cfg, mono_object_gethashcode_gsharedvt, args);
+                                               /* !fsig->hasthis is for the wrapper for the Object.GetType () icall */
+                                               if (fsig->hasthis && fsig->param_count) {
+                                                       /* Pass the arguments using a localloc-ed array using the format expected by runtime_invoke () */
+                                                       MONO_INST_NEW (cfg, ins, OP_LOCALLOC_IMM);
+                                                       ins->dreg = alloc_preg (cfg);
+                                                       ins->inst_imm = fsig->param_count * sizeof (mgreg_t);
+                                                       MONO_ADD_INS (cfg->cbb, ins);
+                                                       args [4] = ins;
+
+                                                       if (mini_is_gsharedvt_type (cfg, fsig->params [0])) {
+                                                               int addr_reg;
+
+                                                               args [3] = emit_get_gsharedvt_info_klass (cfg, mono_class_from_mono_type (fsig->params [0]), MONO_RGCTX_INFO_CLASS_BOX_TYPE);
+
+                                                               EMIT_NEW_VARLOADA_VREG (cfg, ins, sp [1]->dreg, fsig->params [0]);
+                                                               addr_reg = ins->dreg;
+                                                               EMIT_NEW_STORE_MEMBASE (cfg, ins, OP_STORE_MEMBASE_REG, args [4]->dreg, 0, addr_reg);
+                                                       } else {
+                                                               EMIT_NEW_ICONST (cfg, args [3], 0);
+                                                               EMIT_NEW_STORE_MEMBASE (cfg, ins, OP_STORE_MEMBASE_REG, args [4]->dreg, 0, sp [1]->dreg);
+                                                       }
+                                               } else {
+                                                       EMIT_NEW_ICONST (cfg, args [3], 0);
+                                                       EMIT_NEW_ICONST (cfg, args [4], 0);
+                                               }
+                                               ins = mono_emit_jit_icall (cfg, mono_gsharedvt_constrained_call, args);
+                                               emit_widen = FALSE;
+
+                                               if (mini_is_gsharedvt_type (cfg, fsig->ret)) {
+                                                       ins = handle_unbox_gsharedvt (cfg, mono_class_from_mono_type (fsig->ret), ins, &bblock);
+                                               } else if (MONO_TYPE_IS_PRIMITIVE (fsig->ret)) {
+                                                       MonoInst *add;
+
+                                                       /* Unbox */
+                                                       NEW_BIALU_IMM (cfg, add, OP_ADD_IMM, alloc_dreg (cfg, STACK_MP), ins->dreg, sizeof (MonoObject));
+                                                       MONO_ADD_INS (cfg->cbb, add);
+                                                       /* Load value */
+                                                       NEW_LOAD_MEMBASE_TYPE (cfg, ins, fsig->ret, add->dreg, 0);
+                                                       MONO_ADD_INS (cfg->cbb, ins);
+                                                       /* ins represents the call result */
+                                               }
+
                                                goto call_end;
-                                       } else if (constrained_call->valuetype && cmethod->klass->valuetype) {
-                                               /* The 'Own method' case below */
                                        } else {
                                                GSHAREDVT_FAILURE (*ip);
                                        }
@@ -7325,8 +7735,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                         */
                                        EMIT_NEW_LOAD_MEMBASE_TYPE (cfg, ins, &constrained_call->byval_arg, sp [0]->dreg, 0);
                                        ins->klass = constrained_call;
-                                       sp [0] = handle_box (cfg, ins, constrained_call, mono_class_check_context_used (constrained_call));
-                                       bblock = cfg->cbb;
+                                       sp [0] = handle_box (cfg, ins, constrained_call, mono_class_check_context_used (constrained_call), &bblock);
                                        CHECK_CFG_EXCEPTION;
                                } else if (!constrained_call->valuetype) {
                                        int dreg = alloc_ireg_ref (cfg);
@@ -7360,8 +7769,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                                        /* Enum implements some interfaces, so treat this as the first case */
                                                        EMIT_NEW_LOAD_MEMBASE_TYPE (cfg, ins, &constrained_call->byval_arg, sp [0]->dreg, 0);
                                                        ins->klass = constrained_call;
-                                                       sp [0] = handle_box (cfg, ins, constrained_call, mono_class_check_context_used (constrained_call));
-                                                       bblock = cfg->cbb;
+                                                       sp [0] = handle_box (cfg, ins, constrained_call, mono_class_check_context_used (constrained_call), &bblock);
                                                        CHECK_CFG_EXCEPTION;
                                                }
                                        }
@@ -7397,48 +7805,8 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                CHECK_TYPELOAD (cmethod->klass);
                        }
 
-                       if (cmethod && ((cmethod->flags & METHOD_ATTRIBUTE_STATIC) || cmethod->klass->valuetype) &&
-                                       (cmethod->klass->generic_class || cmethod->klass->generic_container)) {
-                               gboolean sharable = FALSE;
-
-                               if (mono_method_is_generic_sharable (cmethod, TRUE)) {
-                                       sharable = TRUE;
-                               } else {
-                                       gboolean sharing_enabled = mono_class_generic_sharing_enabled (cmethod->klass);
-                                       MonoGenericContext *context = mini_class_get_context (cmethod->klass);
-                                       gboolean context_sharable = mono_generic_context_is_sharable (context, TRUE);
-
-                                       sharable = sharing_enabled && context_sharable;
-                               }
-
-                               /*
-                                * Pass vtable iff target method might
-                                * be shared, which means that sharing
-                                * is enabled for its class and its
-                                * context is sharable (and it's not a
-                                * generic method).
-                                */
-                               if (sharable && !(mini_method_get_context (cmethod) && mini_method_get_context (cmethod)->method_inst))
-                                       pass_vtable = TRUE;
-                       }
-
-                       if (cmethod && mini_method_get_context (cmethod) &&
-                                       mini_method_get_context (cmethod)->method_inst) {
-                               g_assert (!pass_vtable);
-
-                               if (mono_method_is_generic_sharable (cmethod, TRUE)) {
-                                       pass_mrgctx = TRUE;
-                               } else {
-                                       gboolean sharing_enabled = mono_class_generic_sharing_enabled (cmethod->klass);
-                                       MonoGenericContext *context = mini_method_get_context (cmethod);
-                                       gboolean context_sharable = mono_generic_context_is_sharable (context, TRUE);
-
-                                       if (sharing_enabled && context_sharable)
-                                               pass_mrgctx = TRUE;
-                                       if (cfg->gsharedvt && mini_is_gsharedvt_signature (cfg, fsig))
-                                               pass_mrgctx = TRUE;
-                               }
-                       }
+                       if (cmethod)
+                               check_method_sharing (cfg, cmethod, &pass_vtable, &pass_mrgctx);
 
                        if (cfg->generic_sharing_context && cmethod) {
                                MonoGenericContext *cmethod_context = mono_method_get_context (cmethod);
@@ -7546,7 +7914,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                                g_assert (cmethod->is_inflated);
                                        imt_arg = emit_get_rgctx_method (cfg, context_used,
                                                                                                         cmethod, MONO_RGCTX_INFO_METHOD);
-                                       ins = mono_emit_method_call_full (cfg, cmethod, fsig, sp, sp [0], imt_arg, NULL);
+                                       ins = mono_emit_method_call_full (cfg, cmethod, fsig, FALSE, sp, sp [0], imt_arg, NULL);
                                } else {
                                        this_temp = mono_compile_create_var (cfg, type_from_stack_type (sp [0]), OP_LOCAL);
                                        NEW_TEMPSTORE (cfg, store, this_temp->inst_c0, sp [0]);
@@ -7816,7 +8184,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                        addr = mini_emit_ldelema_ins (cfg, cmethod, sp, ip, TRUE);
                                        EMIT_NEW_STORE_MEMBASE_TYPE (cfg, ins, fsig->params [fsig->param_count - 1], addr->dreg, 0, val->dreg);
                                        if (cfg->gen_write_barriers && val->type == STACK_OBJ && !(val->opcode == OP_PCONST && val->inst_c0 == 0))
-                                               emit_write_barrier (cfg, addr, val, 0);
+                                               emit_write_barrier (cfg, addr, val);
                                } else if (strcmp (cmethod->name, "Get") == 0) { /* array Get */
                                        addr = mini_emit_ldelema_ins (cfg, cmethod, sp, ip, FALSE);
 
@@ -7846,11 +8214,14 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                        /* FIXME: Enabling TAILC breaks some inlining/stack trace/etc tests */
                        /* FIXME: runtime generic context pointer for jumps? */
                        /* FIXME: handle this for generic sharing eventually */
-                       if (cmethod && 
-                               ((((ins_flag & MONO_INST_TAILCALL) && (call_opcode == CEE_CALL))
-                                 ))//|| ((cfg->opt & MONO_OPT_TAILC) && *ip == CEE_CALL && ip [5] == CEE_RET))
-                               && !vtable_arg && !cfg->generic_sharing_context && is_supported_tail_call (cfg, method, cmethod, fsig))
+                       if (cmethod && (ins_flag & MONO_INST_TAILCALL) &&
+                               !vtable_arg && !cfg->generic_sharing_context && is_supported_tail_call (cfg, method, cmethod, fsig))
                                supported_tail_call = TRUE;
+                       if (supported_tail_call) {
+                               if (call_opcode != CEE_CALL)
+                                       supported_tail_call = FALSE;
+                       }
+
                        if (supported_tail_call) {
                                MonoCallInst *call;
 
@@ -7859,45 +8230,44 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
 
                                //printf ("HIT: %s -> %s\n", mono_method_full_name (cfg->method, TRUE), mono_method_full_name (cmethod, TRUE));
 
-#ifdef MONO_ARCH_USE_OP_TAIL_CALL
-                               /* Handle tail calls similarly to calls */
-                               call = mono_emit_call_args (cfg, mono_method_signature (cmethod), sp, FALSE, FALSE, TRUE, FALSE, FALSE);
-#else
-                               MONO_INST_NEW_CALL (cfg, call, OP_JMP);
-                               call->tail_call = TRUE;
-                               call->method = cmethod;
-                               call->signature = mono_method_signature (cmethod);
-
-                               /*
-                                * We implement tail calls by storing the actual arguments into the 
-                                * argument variables, then emitting a CEE_JMP.
-                                */
-                               for (i = 0; i < n; ++i) {
-                                       /* Prevent argument from being register allocated */
-                                       arg_array [i]->flags |= MONO_INST_VOLATILE;
-                                       EMIT_NEW_ARGSTORE (cfg, ins, i, sp [i]);
-                               }
-#endif
+                               if (ARCH_USE_OP_TAIL_CALL) {
+                                       /* Handle tail calls similarly to normal calls */
+                                       tail_call = TRUE;
+                               } else {
+                                       MONO_INST_NEW_CALL (cfg, call, OP_JMP);
+                                       call->tail_call = TRUE;
+                                       call->method = cmethod;
+                                       call->signature = mono_method_signature (cmethod);
 
-                               ins = (MonoInst*)call;
-                               ins->inst_p0 = cmethod;
-                               ins->inst_p1 = arg_array [0];
-                               MONO_ADD_INS (bblock, ins);
-                               link_bblock (cfg, bblock, end_bblock);                  
-                               start_new_bblock = 1;
+                                       /*
+                                        * We implement tail calls by storing the actual arguments into the 
+                                        * argument variables, then emitting a CEE_JMP.
+                                        */
+                                       for (i = 0; i < n; ++i) {
+                                               /* Prevent argument from being register allocated */
+                                               arg_array [i]->flags |= MONO_INST_VOLATILE;
+                                               EMIT_NEW_ARGSTORE (cfg, ins, i, sp [i]);
+                                       }
+                                       ins = (MonoInst*)call;
+                                       ins->inst_p0 = cmethod;
+                                       ins->inst_p1 = arg_array [0];
+                                       MONO_ADD_INS (bblock, ins);
+                                       link_bblock (cfg, bblock, end_bblock);                  
+                                       start_new_bblock = 1;
 
-                               // FIXME: Eliminate unreachable epilogs
+                                       // FIXME: Eliminate unreachable epilogs
 
-                               /*
-                                * OP_TAILCALL has no return value, so skip the CEE_RET if it is
-                                * only reachable from this call.
-                                */
-                               GET_BBLOCK (cfg, tblock, ip + 5);
-                               if (tblock == bblock || tblock->in_count == 0)
-                                       skip_ret = TRUE;
-                               push_res = FALSE;
+                                       /*
+                                        * OP_TAILCALL has no return value, so skip the CEE_RET if it is
+                                        * only reachable from this call.
+                                        */
+                                       GET_BBLOCK (cfg, tblock, ip + 5);
+                                       if (tblock == bblock || tblock->in_count == 0)
+                                               skip_ret = TRUE;
+                                       push_res = FALSE;
 
-                               goto call_end;
+                                       goto call_end;
+                               }
                        }
 
                        /* 
@@ -7908,14 +8278,33 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                         * change the called method to a dummy wrapper, and resolve that wrapper
                         * to the real method in mono_jit_compile_method ().
                         */
-                       if (cfg->method->wrapper_type == MONO_WRAPPER_SYNCHRONIZED && mono_marshal_method_from_wrapper (cfg->method) == cmethod)
-                               cmethod = mono_marshal_get_synchronized_inner_wrapper (cmethod);
+                       if (cfg->method->wrapper_type == MONO_WRAPPER_SYNCHRONIZED) {
+                               MonoMethod *orig = mono_marshal_method_from_wrapper (cfg->method);
+                               if (cmethod == orig || (cmethod->is_inflated && mono_method_get_declaring_generic_method (cmethod) == orig))
+                                       cmethod = mono_marshal_get_synchronized_inner_wrapper (cmethod);
+                       }
 
                        /* Common call */
                        INLINE_FAILURE ("call");
-                       ins = mono_emit_method_call_full (cfg, cmethod, fsig, sp, virtual ? sp [0] : NULL,
+                       ins = mono_emit_method_call_full (cfg, cmethod, fsig, tail_call, sp, virtual ? sp [0] : NULL,
                                                                                          imt_arg, vtable_arg);
 
+                       if (tail_call) {
+                               link_bblock (cfg, bblock, end_bblock);                  
+                               start_new_bblock = 1;
+
+                               // FIXME: Eliminate unreachable epilogs
+
+                               /*
+                                * OP_TAILCALL has no return value, so skip the CEE_RET if it is
+                                * only reachable from this call.
+                                */
+                               GET_BBLOCK (cfg, tblock, ip + 5);
+                               if (tblock == bblock || tblock->in_count == 0)
+                                       skip_ret = TRUE;
+                               push_res = FALSE;
+                       }
+
                        call_end:
 
                        /* End of call, INS should contain the result of the call, if any */
@@ -7945,7 +8334,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                        ins_flag = 0;
                        constrained_call = NULL;
                        if (need_seq_point)
-                               emit_seq_point (cfg, method, ip, FALSE);
+                               emit_seq_point (cfg, method, ip, FALSE, TRUE);
                        break;
                }
                case CEE_RET:
@@ -8008,7 +8397,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                                        ins->klass = mono_class_from_mono_type (ret_type);
                                                }
                                        } else {
-#ifdef MONO_ARCH_SOFT_FLOAT
+#ifdef MONO_ARCH_SOFT_FLOAT_FALLBACK
                                                if (COMPILE_SOFT_FLOAT (cfg) && !ret_type->byref && ret_type->type == MONO_TYPE_R4) {
                                                        MonoInst *iargs [1];
                                                        MonoInst *conv;
@@ -8354,7 +8743,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                        MONO_ADD_INS (bblock, ins);
 
                        if (cfg->gen_write_barriers && *ip == CEE_STIND_REF && method->wrapper_type != MONO_WRAPPER_WRITE_BARRIER && !((sp [1]->opcode == OP_PCONST) && (sp [1]->inst_p0 == 0)))
-                               emit_write_barrier (cfg, sp [0], sp [1], -1);
+                               emit_write_barrier (cfg, sp [0], sp [1]);
 
                        inline_costs += 1;
                        ++ip;
@@ -8565,7 +8954,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                MONO_ADD_INS (cfg->cbb, store);
 
                                if (cfg->gen_write_barriers && cfg->method->wrapper_type != MONO_WRAPPER_WRITE_BARRIER)
-                                       emit_write_barrier (cfg, sp [0], sp [1], -1);
+                                       emit_write_barrier (cfg, sp [0], sp [1]);
                        } else {
                                mini_emit_stobj (cfg, sp [0], sp [1], klass, FALSE);
                        }
@@ -8840,7 +9229,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                /* we simply pass a null pointer */
                                EMIT_NEW_PCONST (cfg, *sp, NULL); 
                                /* now call the string ctor */
-                               alloc = mono_emit_method_call_full (cfg, cmethod, fsig, sp, NULL, NULL, NULL);
+                               alloc = mono_emit_method_call_full (cfg, cmethod, fsig, FALSE, sp, NULL, NULL, NULL);
                        } else {
                                MonoInst* callvirt_this_arg = NULL;
                                
@@ -8860,8 +9249,10 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                        alloc = handle_alloc (cfg, cmethod->klass, FALSE, context_used);
                                        *sp = alloc;
                                } else {
-                                       MonoVTable *vtable = mono_class_vtable (cfg->domain, cmethod->klass);
+                                       MonoVTable *vtable = NULL;
 
+                                       if (!cfg->compile_aot)
+                                               vtable = mono_class_vtable (cfg->domain, cmethod->klass);
                                        CHECK_TYPELOAD (cmethod->klass);
 
                                        /*
@@ -8869,11 +9260,11 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                         * call in mono_jit_runtime_invoke () can abort the finalizer thread.
                                         * As a workaround, we call class cctors before allocating objects.
                                         */
-                                       if (mini_field_access_needs_cctor_run (cfg, method, vtable) && !(g_slist_find (class_inits, vtable))) {
-                                               mono_emit_abs_call (cfg, MONO_PATCH_INFO_CLASS_INIT, vtable->klass, helper_sig_class_init_trampoline, NULL);
+                                       if (mini_field_access_needs_cctor_run (cfg, method, cmethod->klass, vtable) && !(g_slist_find (class_inits, cmethod->klass))) {
+                                               mono_emit_abs_call (cfg, MONO_PATCH_INFO_CLASS_INIT, cmethod->klass, helper_sig_class_init_trampoline, NULL);
                                                if (cfg->verbose_level > 2)
                                                        printf ("class %s.%s needs init call for ctor\n", cmethod->klass->name_space, cmethod->klass->name);
-                                               class_inits = g_slist_prepend (class_inits, vtable);
+                                               class_inits = g_slist_prepend (class_inits, cmethod->klass);
                                        }
 
                                        alloc = handle_alloc (cfg, cmethod->klass, FALSE, 0);
@@ -8914,7 +9305,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                                // FIXME-VT: Clean this up
                                                if (cfg->gsharedvt && mini_is_gsharedvt_signature (cfg, fsig))
                                                        GSHAREDVT_FAILURE(*ip);
-                                               mono_emit_method_call_full (cfg, cmethod, fsig, sp, callvirt_this_arg, NULL, NULL);
+                                               mono_emit_method_call_full (cfg, cmethod, fsig, FALSE, sp, callvirt_this_arg, NULL, NULL);
                                        }
                                } else if (cfg->gsharedvt && mini_is_gsharedvt_signature (cfg, fsig)) {
                                        MonoInst *addr;
@@ -8932,7 +9323,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                        mono_emit_calli (cfg, fsig, sp, cmethod_addr, NULL, vtable_arg);
                                } else {
                                        INLINE_FAILURE ("ctor call");
-                                       ins = mono_emit_method_call_full (cfg, cmethod, fsig, sp,
+                                       ins = mono_emit_method_call_full (cfg, cmethod, fsig, FALSE, sp,
                                                                                                          callvirt_this_arg, NULL, vtable_arg);
                                }
                        }
@@ -8979,7 +9370,10 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                        EMIT_NEW_PCONST (cfg, args [2], mono_domain_alloc0 (cfg->domain, sizeof (gpointer)));
 
                                /*The wrapper doesn't inline well so the bloat of inlining doesn't pay off.*/
+
+                               save_cast_details (cfg, klass, sp [0]->dreg, TRUE, &bblock);
                                *sp++ = mono_emit_method_call (cfg, mono_castclass, args, NULL);
+                               reset_cast_details (cfg);
                                ip += 5;
                                inline_costs += 2;
                        } else if (!context_used && (mono_class_is_marshalbyref (klass) || klass->flags & TYPE_ATTRIBUTE_INTERFACE)) {
@@ -8990,8 +9384,10 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                mono_castclass = mono_marshal_get_castclass (klass); 
                                iargs [0] = sp [0];
                                
+                               save_cast_details (cfg, klass, sp [0]->dreg, TRUE, &bblock);
                                costs = inline_method (cfg, mono_castclass, mono_method_signature (mono_castclass), 
                                                           iargs, ip, cfg->real_offset, dont_inline, TRUE);
+                               reset_cast_details (cfg);
                                CHECK_CFG_EXCEPTION;
                                g_assert (costs > 0);
                                
@@ -9085,60 +9481,8 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                        context_used = mini_class_check_context_used (cfg, klass);
 
                        if (mini_is_gsharedvt_klass (cfg, klass)) {
-                               MonoInst *obj, *addr, *klass_inst, *is_ref, *args[16];
-                               MonoBasicBlock *is_ref_bb, *end_bb;
-                               int dreg, addr_reg;
-
-                               /* Need to check for nullable types at runtime, but those are disabled in mini_is_gsharedvt_sharable_method*/
-                               if (mono_class_is_nullable (klass))
-                                       GSHAREDVT_FAILURE (*ip);
-
-                               obj = *sp;
-
-                               klass_inst = emit_get_rgctx_klass (cfg, context_used, klass, MONO_RGCTX_INFO_KLASS);
-
-                               /* obj */
-                               args [0] = obj;
-
-                               /* klass */
-                               args [1] = klass_inst;
-
-                               /* CASTCLASS */
-                               obj = mono_emit_jit_icall (cfg, mono_object_castclass, args);
-
-                               NEW_BBLOCK (cfg, is_ref_bb);
-                               NEW_BBLOCK (cfg, end_bb);
-                               is_ref = emit_get_rgctx_klass (cfg, context_used, klass,
-                                                                                          MONO_RGCTX_INFO_CLASS_IS_REF);
-                               MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, is_ref->dreg, 1);
-                               MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_IBEQ, is_ref_bb);
-
-                               /* This will contain either the address of the unboxed vtype, or an address of the temporary where the ref is stored */
-                               addr_reg = alloc_dreg (cfg, STACK_MP);
-
-                               /* Non-ref case */
-                               /* UNBOX */
-                               NEW_BIALU_IMM (cfg, addr, OP_ADD_IMM, addr_reg, obj->dreg, sizeof (MonoObject));
-                               MONO_ADD_INS (cfg->cbb, addr);
-
-                               MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, end_bb);
-
-                               /* Ref case */
-                               MONO_START_BB (cfg, is_ref_bb);
-
-                               /* Save the ref to a temporary */
-                               dreg = alloc_ireg (cfg);
-                               EMIT_NEW_VARLOADA_VREG (cfg, addr, dreg, &klass->byval_arg);
-                               addr->dreg = addr_reg;
-                               MONO_EMIT_NEW_STORE_MEMBASE (cfg, OP_STORE_MEMBASE_REG, addr->dreg, 0, obj->dreg);
-                               MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, end_bb);
-
-                               MONO_START_BB (cfg, end_bb);
-                               bblock = cfg->cbb;
-
-                               /* LDOBJ */
-                               EMIT_NEW_LOAD_MEMBASE_TYPE (cfg, ins, &klass->byval_arg, addr_reg, 0);
-                               *sp++ = ins;
+                               *sp = handle_unbox_gsharedvt (cfg, klass, *sp, &bblock);
+                               sp ++;
 
                                ip += 5;
                                inline_costs += 2;
@@ -9316,8 +9660,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                break;
                        }
 
-                       *sp++ = handle_box (cfg, val, klass, context_used);
-                       bblock = cfg->cbb;
+                       *sp++ = handle_box (cfg, val, klass, context_used, &bblock);
 
                        CHECK_CFG_EXCEPTION;
                        ip += 5;
@@ -9488,7 +9831,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
 
                                                context_used = mini_class_check_context_used (cfg, klass);
 
-                                               offset_ins = emit_get_rgctx_field (cfg, context_used, field, MONO_RGCTX_INFO_FIELD_OFFSET);
+                                               offset_ins = emit_get_gsharedvt_info (cfg, field, MONO_RGCTX_INFO_FIELD_OFFSET);
                                                dreg = alloc_ireg_mp (cfg);
                                                EMIT_NEW_BIALU (cfg, ins, OP_PADD, dreg, sp [0]->dreg, offset_ins->dreg);
                                                /* The decomposition will call mini_emit_stobj () which will emit a wbarrier if needed */
@@ -9506,7 +9849,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
 
                                        dreg = alloc_ireg_mp (cfg);
                                        EMIT_NEW_BIALU_IMM (cfg, ptr, OP_PADD_IMM, dreg, sp [0]->dreg, foffset);
-                                       emit_write_barrier (cfg, ptr, sp [1], -1);
+                                       emit_write_barrier (cfg, ptr, sp [1]);
                                }
 
                                        store->flags |= ins_flag;
@@ -9577,7 +9920,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                                if (mini_is_gsharedvt_klass (cfg, klass)) {
                                                        MonoInst *offset_ins;
 
-                                                       offset_ins = emit_get_rgctx_field (cfg, context_used, field, MONO_RGCTX_INFO_FIELD_OFFSET);
+                                                       offset_ins = emit_get_gsharedvt_info (cfg, field, MONO_RGCTX_INFO_FIELD_OFFSET);
                                                        EMIT_NEW_BIALU (cfg, ins, OP_PADD, dreg, sp [0]->dreg, offset_ins->dreg);
                                                } else {
                                                        EMIT_NEW_BIALU_IMM (cfg, ins, OP_PADD_IMM, dreg, sp [0]->dreg, foffset);
@@ -9594,7 +9937,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                        if (mini_is_gsharedvt_klass (cfg, klass)) {
                                                MonoInst *offset_ins;
 
-                                               offset_ins = emit_get_rgctx_field (cfg, context_used, field, MONO_RGCTX_INFO_FIELD_OFFSET);
+                                               offset_ins = emit_get_gsharedvt_info (cfg, field, MONO_RGCTX_INFO_FIELD_OFFSET);
                                                dreg = alloc_ireg_mp (cfg);
                                                EMIT_NEW_BIALU (cfg, ins, OP_PADD, dreg, sp [0]->dreg, offset_ins->dreg);
                                                EMIT_NEW_LOAD_MEMBASE_TYPE (cfg, load, field->type, dreg, 0);
@@ -9750,16 +10093,19 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                EMIT_NEW_FIELDCONST (cfg, iargs [1], field);
                                ins = mono_emit_jit_icall (cfg, mono_class_static_field_address, iargs);
                        } else {
-                               MonoVTable *vtable = mono_class_vtable (cfg->domain, klass);
+                               MonoVTable *vtable = NULL;
 
+                               if (!cfg->compile_aot)
+                                       vtable = mono_class_vtable (cfg->domain, klass);
                                CHECK_TYPELOAD (klass);
+
                                if (!addr) {
-                                       if (mini_field_access_needs_cctor_run (cfg, method, vtable)) {
-                                               if (!(g_slist_find (class_inits, vtable))) {
-                                                       mono_emit_abs_call (cfg, MONO_PATCH_INFO_CLASS_INIT, vtable->klass, helper_sig_class_init_trampoline, NULL);
+                                       if (mini_field_access_needs_cctor_run (cfg, method, klass, vtable)) {
+                                               if (!(g_slist_find (class_inits, klass))) {
+                                                       mono_emit_abs_call (cfg, MONO_PATCH_INFO_CLASS_INIT, klass, helper_sig_class_init_trampoline, NULL);
                                                        if (cfg->verbose_level > 2)
                                                                printf ("class %s.%s needs init call for %s\n", klass->name_space, klass->name, mono_field_get_name (field));
-                                                       class_inits = g_slist_prepend (class_inits, vtable);
+                                                       class_inits = g_slist_prepend (class_inits, klass);
                                                }
                                        } else {
                                                if (cfg->run_cctors) {
@@ -9767,6 +10113,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                                        /* This makes so that inline cannot trigger */
                                                        /* .cctors: too many apps depend on them */
                                                        /* running with a specific order... */
+                                                       g_assert (vtable);
                                                        if (! vtable->initialized)
                                                                INLINE_FAILURE ("class init");
                                                        ex = mono_runtime_class_init_full (vtable, FALSE);
@@ -9776,12 +10123,13 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                                        }
                                                }
                                        }
-                                       addr = (char*)mono_vtable_get_static_field_data (vtable) + field->offset;
-
                                        if (cfg->compile_aot)
                                                EMIT_NEW_SFLDACONST (cfg, ins, field);
-                                       else
+                                       else {
+                                               g_assert (vtable);
+                                               addr = (char*)mono_vtable_get_static_field_data (vtable) + field->offset;
                                                EMIT_NEW_PCONST (cfg, ins, addr);
+                                       }
                                } else {
                                        MonoInst *iargs [1];
                                        EMIT_NEW_ICONST (cfg, iargs [0], GPOINTER_TO_UINT (addr));
@@ -9912,7 +10260,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                        if (cfg->gen_write_barriers && cfg->method->wrapper_type != MONO_WRAPPER_WRITE_BARRIER &&
                                        generic_class_is_reference_type (cfg, klass)) {
                                /* insert call to write barrier */
-                               emit_write_barrier (cfg, sp [0], sp [1], -1);
+                               emit_write_barrier (cfg, sp [0], sp [1]);
                        }
                        ins_flag = 0;
                        ip += 5;
@@ -9940,7 +10288,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                        context_used = mini_class_check_context_used (cfg, klass);
 
                        if (sp [0]->type == STACK_I8 || (SIZEOF_VOID_P == 8 && sp [0]->type == STACK_PTR)) {
-                               MONO_INST_NEW (cfg, ins, OP_LCONV_TO_I4);
+                               MONO_INST_NEW (cfg, ins, OP_LCONV_TO_OVF_U4);
                                ins->sreg1 = sp [0]->dreg;
                                ins->type = STACK_I4;
                                ins->dreg = alloc_ireg (cfg);
@@ -10340,7 +10688,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                if ((ip + 5 < end) && ip_in_bb (cfg, bblock, ip + 5) && 
                                        ((ip [5] == CEE_CALL) || (ip [5] == CEE_CALLVIRT)) && 
                                        (cmethod = mini_get_method (cfg, method, read32 (ip + 6), NULL, generic_context)) &&
-                                       (cmethod->klass == mono_defaults.monotype_class->parent) &&
+                                       (cmethod->klass == mono_defaults.systemtype_class) &&
                                        (strcmp (cmethod->name, "GetTypeFromHandle") == 0)) {
                                        MonoClass *tclass = mono_class_from_mono_type (handle);
 
@@ -10419,7 +10767,7 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                case CEE_ENDFINALLY:
                        /* mono_save_seq_point_info () depends on this */
                        if (sp != stack_start)
-                               emit_seq_point (cfg, method, ip, FALSE);
+                               emit_seq_point (cfg, method, ip, FALSE, FALSE);
                        MONO_INST_NEW (cfg, ins, OP_ENDFINALLY);
                        MONO_ADD_INS (bblock, ins);
                        ip++;
@@ -10775,17 +11123,31 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                bblock->out_of_line = TRUE;
                                ip += 2;
                                break;
-                       case CEE_MONO_TLS:
+                       case CEE_MONO_TLS: {
+                               int key;
+
                                CHECK_STACK_OVF (1);
                                CHECK_OPSIZE (6);
-                               MONO_INST_NEW (cfg, ins, OP_TLS_GET);
-                               ins->dreg = alloc_preg (cfg);
-                               ins->inst_offset = (gint32)read32 (ip + 2);
+                               key = (gint32)read32 (ip + 2);
+                               g_assert (key < TLS_KEY_NUM);
+
+                               ins = mono_create_tls_get (cfg, key);
+                               if (!ins) {
+                                       if (cfg->compile_aot) {
+                                               cfg->disable_aot = TRUE;
+                                               MONO_INST_NEW (cfg, ins, OP_TLS_GET);
+                                               ins->dreg = alloc_preg (cfg);
+                                               ins->type = STACK_PTR;
+                                       } else {
+                                               g_assert_not_reached ();
+                                       }
+                               }
                                ins->type = STACK_PTR;
                                MONO_ADD_INS (bblock, ins);
                                *sp++ = ins;
                                ip += 6;
                                break;
+                       }
                        case CEE_MONO_DYN_CALL: {
                                MonoCallInst *call;
 
@@ -10841,7 +11203,6 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                lmf_ins = mono_get_lmf_intrinsic (cfg);
 #endif
 
-#ifdef MONO_ARCH_HAVE_TLS_GET
                                if (MONO_ARCH_HAVE_TLS_GET && ad_ins && lmf_ins) {
                                        NEW_BBLOCK (cfg, next_bb);
 
@@ -10853,7 +11214,6 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
                                        MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, lmf_ins->dreg, 0);
                                        MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBNE_UN, next_bb);
                                }
-#endif
 
                                if (cfg->compile_aot) {
                                        /* AOT code is only used in the root domain */
@@ -12174,13 +12534,17 @@ mono_handle_global_vregs (MonoCompile *cfg)
 #if SIZEOF_REGISTER == 8
                case STACK_I8:
 #endif
-#if !defined(TARGET_X86) && !defined(MONO_ARCH_SOFT_FLOAT)
+#if !defined(TARGET_X86)
                /* Enabling this screws up the fp stack on x86 */
                case STACK_R8:
 #endif
+                       if (mono_arch_is_soft_float ())
+                               break;
+
                        /* Arguments are implicitly global */
                        /* Putting R4 vars into registers doesn't work currently */
-                       if ((var->opcode != OP_ARG) && (var != cfg->ret) && !(var->flags & (MONO_INST_VOLATILE|MONO_INST_INDIRECT)) && (vreg_to_bb [var->dreg] != -1) && (var->klass->byval_arg.type != MONO_TYPE_R4) && !cfg->disable_vreg_to_lvreg) {
+                       /* The gsharedvt vars are implicitly referenced by ldaddr opcodes, but those opcodes are only generated later */
+                       if ((var->opcode != OP_ARG) && (var != cfg->ret) && !(var->flags & (MONO_INST_VOLATILE|MONO_INST_INDIRECT)) && (vreg_to_bb [var->dreg] != -1) && (var->klass->byval_arg.type != MONO_TYPE_R4) && !cfg->disable_vreg_to_lvreg && var != cfg->gsharedvt_info_var && var != cfg->gsharedvt_locals_var) {
                                /* 
                                 * Make that the variable's liveness interval doesn't contain a call, since
                                 * that would cause the lvreg to be spilled, making the whole optimization
@@ -12285,6 +12649,7 @@ mono_spill_global_vars (MonoCompile *cfg, gboolean *need_local_opts)
        guint32 stacktypes [128];
        MonoInst **live_range_start, **live_range_end;
        MonoBasicBlock **live_range_start_bb, **live_range_end_bb;
+       int *gsharedvt_vreg_to_idx = NULL;
 
        *need_local_opts = FALSE;
 
@@ -12343,6 +12708,29 @@ mono_spill_global_vars (MonoCompile *cfg, gboolean *need_local_opts)
                                ins->flags |= MONO_INST_GC_TRACK;
                }
        }
+
+       if (cfg->gsharedvt) {
+               gsharedvt_vreg_to_idx = g_new0 (int, cfg->next_vreg);
+
+               for (i = 0; i < cfg->num_varinfo; ++i) {
+                       MonoInst *ins = cfg->varinfo [i];
+                       int idx;
+
+                       if (mini_is_gsharedvt_variable_type (cfg, ins->inst_vtype)) {
+                               if (i >= cfg->locals_start) {
+                                       /* Local */
+                                       idx = get_gsharedvt_info_slot (cfg, ins->inst_vtype, MONO_RGCTX_INFO_LOCAL_OFFSET);
+                                       gsharedvt_vreg_to_idx [ins->dreg] = idx + 1;
+                                       ins->opcode = OP_GSHAREDVT_LOCAL;
+                                       ins->inst_imm = idx;
+                               } else {
+                                       /* Arg */
+                                       gsharedvt_vreg_to_idx [ins->dreg] = -1;
+                                       ins->opcode = OP_GSHAREDVT_ARG_REGOFFSET;
+                               }
+                       }
+               }
+       }
                
        /* FIXME: widening and truncation */
 
@@ -12419,6 +12807,63 @@ mono_spill_global_vars (MonoCompile *cfg, gboolean *need_local_opts)
                                                ins->inst_offset = vtaddr->inst_offset;
                                        } else
                                                NOT_IMPLEMENTED;
+                               } else if (cfg->gsharedvt && gsharedvt_vreg_to_idx [var->dreg] < 0) {
+                                       /* gsharedvt arg passed by ref */
+                                       g_assert (var->opcode == OP_GSHAREDVT_ARG_REGOFFSET);
+
+                                       ins->opcode = OP_LOAD_MEMBASE;
+                                       ins->inst_basereg = var->inst_basereg;
+                                       ins->inst_offset = var->inst_offset;
+                               } else if (cfg->gsharedvt && gsharedvt_vreg_to_idx [var->dreg]) {
+                                       MonoInst *load, *load2, *load3;
+                                       int idx = gsharedvt_vreg_to_idx [var->dreg] - 1;
+                                       int reg1, reg2, reg3;
+                                       MonoInst *info_var = cfg->gsharedvt_info_var;
+                                       MonoInst *locals_var = cfg->gsharedvt_locals_var;
+
+                                       /*
+                                        * gsharedvt local.
+                                        * Compute the address of the local as gsharedvt_locals_var + gsharedvt_info_var->locals_offsets [idx].
+                                        */
+
+                                       g_assert (var->opcode == OP_GSHAREDVT_LOCAL);
+
+                                       g_assert (info_var);
+                                       g_assert (locals_var);
+
+                                       /* Mark the instruction used to compute the locals var as used */
+                                       cfg->gsharedvt_locals_var_ins = NULL;
+
+                                       /* Load the offset */
+                                       if (info_var->opcode == OP_REGOFFSET) {
+                                               reg1 = alloc_ireg (cfg);
+                                               NEW_LOAD_MEMBASE (cfg, load, OP_LOAD_MEMBASE, reg1, info_var->inst_basereg, info_var->inst_offset);
+                                       } else if (info_var->opcode == OP_REGVAR) {
+                                               load = NULL;
+                                               reg1 = info_var->dreg;
+                                       } else {
+                                               g_assert_not_reached ();
+                                       }
+                                       reg2 = alloc_ireg (cfg);
+                                       NEW_LOAD_MEMBASE (cfg, load2, OP_LOADI4_MEMBASE, reg2, reg1, G_STRUCT_OFFSET (MonoGSharedVtMethodRuntimeInfo, entries) + (idx * sizeof (gpointer)));
+                                       /* Load the locals area address */
+                                       reg3 = alloc_ireg (cfg);
+                                       if (locals_var->opcode == OP_REGOFFSET) {
+                                               NEW_LOAD_MEMBASE (cfg, load3, OP_LOAD_MEMBASE, reg3, locals_var->inst_basereg, locals_var->inst_offset);
+                                       } else if (locals_var->opcode == OP_REGVAR) {
+                                               NEW_UNALU (cfg, load3, OP_MOVE, reg3, locals_var->dreg);
+                                       } else {
+                                               g_assert_not_reached ();
+                                       }
+                                       /* Compute the address */
+                                       ins->opcode = OP_PADD;
+                                       ins->sreg1 = reg3;
+                                       ins->sreg2 = reg2;
+
+                                       mono_bblock_insert_before_ins (bb, ins, load3);
+                                       mono_bblock_insert_before_ins (bb, load3, load2);
+                                       if (load)
+                                               mono_bblock_insert_before_ins (bb, load2, load);
                                } else {
                                        g_assert (var->opcode == OP_REGOFFSET);
 
@@ -12804,6 +13249,12 @@ mono_spill_global_vars (MonoCompile *cfg, gboolean *need_local_opts)
        }
 #endif
 
+       if (cfg->gsharedvt_locals_var_ins) {
+               /* Nullify if unused */
+               cfg->gsharedvt_locals_var_ins->opcode = OP_PCONST;
+               cfg->gsharedvt_locals_var_ins->inst_imm = 0;
+       }
+
        g_free (live_range_start);
        g_free (live_range_end);
        g_free (live_range_start_bb);