*
* (C) 2006 Novell, Inc. http://www.novell.com
* Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
+ * Licensed under the MIT license. See LICENSE file in the project root for full license information.
*/
#include <config.h>
return mono_bitset_mem_new (mem, max_size, MONO_BITSET_DONT_FREE);
}
+/*
+ * Replaces ins with optimized opcodes.
+ *
+ * We can emit to cbb the equivalent instructions which will be used as
+ * replacement for ins, or simply change the fields of ins. Spec needs to
+ * be updated if we silently change the opcode of ins.
+ *
+ * Returns TRUE if additional vregs were allocated.
+ */
+static gboolean
+mono_strength_reduction_ins (MonoCompile *cfg, MonoInst *ins, const char **spec)
+{
+ gboolean allocated_vregs = FALSE;
+
+ /* FIXME: Add long/float */
+ switch (ins->opcode) {
+ case OP_MOVE:
+ case OP_XMOVE:
+ if (ins->dreg == ins->sreg1) {
+ NULLIFY_INS (ins);
+ }
+ break;
+ case OP_ADD_IMM:
+ case OP_IADD_IMM:
+ case OP_SUB_IMM:
+ case OP_ISUB_IMM:
+#if SIZEOF_REGISTER == 8
+ case OP_LADD_IMM:
+ case OP_LSUB_IMM:
+#endif
+ if (ins->inst_imm == 0) {
+ ins->opcode = OP_MOVE;
+ }
+ break;
+ case OP_MUL_IMM:
+ case OP_IMUL_IMM:
+#if SIZEOF_REGISTER == 8
+ case OP_LMUL_IMM:
+#endif
+ if (ins->inst_imm == 0) {
+ ins->opcode = (ins->opcode == OP_LMUL_IMM) ? OP_I8CONST : OP_ICONST;
+ ins->inst_c0 = 0;
+ ins->sreg1 = -1;
+ } else if (ins->inst_imm == 1) {
+ ins->opcode = OP_MOVE;
+ } else if ((ins->opcode == OP_IMUL_IMM) && (ins->inst_imm == -1)) {
+ ins->opcode = OP_INEG;
+ } else if ((ins->opcode == OP_LMUL_IMM) && (ins->inst_imm == -1)) {
+ ins->opcode = OP_LNEG;
+ } else {
+ int power2 = mono_is_power_of_two (ins->inst_imm);
+ if (power2 >= 0) {
+ ins->opcode = (ins->opcode == OP_MUL_IMM) ? OP_SHL_IMM : ((ins->opcode == OP_LMUL_IMM) ? OP_LSHL_IMM : OP_ISHL_IMM);
+ ins->inst_imm = power2;
+ }
+ }
+ break;
+ case OP_IREM_UN_IMM:
+ case OP_IDIV_UN_IMM: {
+ int c = ins->inst_imm;
+ int power2 = mono_is_power_of_two (c);
+
+ if (power2 >= 0) {
+ if (ins->opcode == OP_IREM_UN_IMM) {
+ ins->opcode = OP_IAND_IMM;
+ ins->sreg2 = -1;
+ ins->inst_imm = (1 << power2) - 1;
+ } else if (ins->opcode == OP_IDIV_UN_IMM) {
+ ins->opcode = OP_ISHR_UN_IMM;
+ ins->sreg2 = -1;
+ ins->inst_imm = power2;
+ }
+ }
+ break;
+ }
+ case OP_IDIV_IMM: {
+ int c = ins->inst_imm;
+ int power2 = mono_is_power_of_two (c);
+
+ if (power2 == 1) {
+ int r1 = mono_alloc_ireg (cfg);
+
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHR_UN_IMM, r1, ins->sreg1, 31);
+ MONO_EMIT_NEW_BIALU (cfg, OP_IADD, r1, r1, ins->sreg1);
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHR_IMM, ins->dreg, r1, 1);
+
+ allocated_vregs = TRUE;
+ } else if (power2 > 0 && power2 < 31) {
+ int r1 = mono_alloc_ireg (cfg);
+
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHR_IMM, r1, ins->sreg1, 31);
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHR_UN_IMM, r1, r1, (32 - power2));
+ MONO_EMIT_NEW_BIALU (cfg, OP_IADD, r1, r1, ins->sreg1);
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHR_IMM, ins->dreg, r1, power2);
+
+ allocated_vregs = TRUE;
+ }
+ break;
+ }
+#if SIZEOF_REGISTER == 8
+ case OP_LREM_IMM:
+#endif
+ case OP_IREM_IMM: {
+ int power = mono_is_power_of_two (ins->inst_imm);
+ if (ins->inst_imm == 1) {
+ ins->opcode = OP_ICONST;
+ MONO_INST_NULLIFY_SREGS (ins);
+ ins->inst_c0 = 0;
+#if __s390__
+ }
+#else
+ } else if ((ins->inst_imm > 0) && (ins->inst_imm < (1LL << 32)) && (power != -1)) {
+ gboolean is_long = ins->opcode == OP_LREM_IMM;
+ int compensator_reg = alloc_ireg (cfg);
+ int intermediate_reg;
+
+ /* Based on gcc code */
+
+ /* Add compensation for negative numerators */
+
+ if (power > 1) {
+ intermediate_reg = compensator_reg;
+ MONO_EMIT_NEW_BIALU_IMM (cfg, is_long ? OP_LSHR_IMM : OP_ISHR_IMM, intermediate_reg, ins->sreg1, is_long ? 63 : 31);
+ } else {
+ intermediate_reg = ins->sreg1;
+ }
+
+ MONO_EMIT_NEW_BIALU_IMM (cfg, is_long ? OP_LSHR_UN_IMM : OP_ISHR_UN_IMM, compensator_reg, intermediate_reg, (is_long ? 64 : 32) - power);
+ MONO_EMIT_NEW_BIALU (cfg, is_long ? OP_LADD : OP_IADD, ins->dreg, ins->sreg1, compensator_reg);
+ /* Compute remainder */
+ MONO_EMIT_NEW_BIALU_IMM (cfg, is_long ? OP_LAND_IMM : OP_AND_IMM, ins->dreg, ins->dreg, (1 << power) - 1);
+ /* Remove compensation */
+ MONO_EMIT_NEW_BIALU (cfg, is_long ? OP_LSUB : OP_ISUB, ins->dreg, ins->dreg, compensator_reg);
+
+ allocated_vregs = TRUE;
+ }
+#endif
+ break;
+ }
+#if SIZEOF_REGISTER == 4
+ case OP_LSHR_IMM: {
+ if (COMPILE_LLVM (cfg))
+ break;
+ if (ins->inst_c1 == 32) {
+ MONO_EMIT_NEW_UNALU (cfg, OP_MOVE, MONO_LVREG_LS (ins->dreg), MONO_LVREG_MS (ins->sreg1));
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHR_IMM, MONO_LVREG_MS (ins->dreg), MONO_LVREG_MS (ins->sreg1), 31);
+ } else if (ins->inst_c1 == 0) {
+ MONO_EMIT_NEW_UNALU (cfg, OP_MOVE, MONO_LVREG_LS (ins->dreg), MONO_LVREG_LS (ins->sreg1));
+ MONO_EMIT_NEW_UNALU (cfg, OP_MOVE, MONO_LVREG_MS (ins->dreg), MONO_LVREG_MS (ins->sreg1));
+ } else if (ins->inst_c1 > 32) {
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHR_IMM, MONO_LVREG_LS (ins->dreg), MONO_LVREG_MS (ins->sreg1), ins->inst_c1 - 32);
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHR_IMM, MONO_LVREG_MS (ins->dreg), MONO_LVREG_MS (ins->sreg1), 31);
+ } else {
+ guint32 tmpreg = alloc_ireg (cfg);
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHL_IMM, tmpreg, MONO_LVREG_MS (ins->sreg1), 32 - ins->inst_c1);
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHR_IMM, MONO_LVREG_MS (ins->dreg), MONO_LVREG_MS (ins->sreg1), ins->inst_c1);
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHR_UN_IMM, MONO_LVREG_LS (ins->dreg), MONO_LVREG_LS (ins->sreg1), ins->inst_c1);
+ MONO_EMIT_NEW_BIALU (cfg, OP_IOR, MONO_LVREG_LS (ins->dreg), MONO_LVREG_LS (ins->dreg), tmpreg);
+ allocated_vregs = TRUE;
+ }
+ break;
+ }
+ case OP_LSHR_UN_IMM: {
+ if (COMPILE_LLVM (cfg))
+ break;
+ if (ins->inst_c1 == 32) {
+ MONO_EMIT_NEW_UNALU (cfg, OP_MOVE, MONO_LVREG_LS (ins->dreg), MONO_LVREG_MS (ins->sreg1));
+ MONO_EMIT_NEW_ICONST (cfg, MONO_LVREG_MS (ins->dreg), 0);
+ } else if (ins->inst_c1 == 0) {
+ MONO_EMIT_NEW_UNALU (cfg, OP_MOVE, MONO_LVREG_LS (ins->dreg), MONO_LVREG_LS (ins->sreg1));
+ MONO_EMIT_NEW_UNALU (cfg, OP_MOVE, MONO_LVREG_MS (ins->dreg), MONO_LVREG_MS (ins->sreg1));
+ } else if (ins->inst_c1 > 32) {
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHR_UN_IMM, MONO_LVREG_LS (ins->dreg), MONO_LVREG_MS (ins->sreg1), ins->inst_c1 - 32);
+ MONO_EMIT_NEW_ICONST (cfg, MONO_LVREG_MS (ins->dreg), 0);
+ } else {
+ guint32 tmpreg = alloc_ireg (cfg);
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHL_IMM, tmpreg, MONO_LVREG_MS (ins->sreg1), 32 - ins->inst_c1);
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHR_UN_IMM, MONO_LVREG_MS (ins->dreg), MONO_LVREG_MS (ins->sreg1), ins->inst_c1);
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHR_UN_IMM, MONO_LVREG_LS (ins->dreg), MONO_LVREG_LS (ins->sreg1), ins->inst_c1);
+ MONO_EMIT_NEW_BIALU (cfg, OP_IOR, MONO_LVREG_LS (ins->dreg), MONO_LVREG_LS (ins->dreg), tmpreg);
+ allocated_vregs = TRUE;
+ }
+ break;
+ }
+ case OP_LSHL_IMM: {
+ if (COMPILE_LLVM (cfg))
+ break;
+ if (ins->inst_c1 == 32) {
+ /* just move the lower half to the upper and zero the lower word */
+ MONO_EMIT_NEW_UNALU (cfg, OP_MOVE, MONO_LVREG_MS (ins->dreg), MONO_LVREG_LS (ins->sreg1));
+ MONO_EMIT_NEW_ICONST (cfg, MONO_LVREG_LS (ins->dreg), 0);
+ } else if (ins->inst_c1 == 0) {
+ MONO_EMIT_NEW_UNALU (cfg, OP_MOVE, MONO_LVREG_LS (ins->dreg), MONO_LVREG_LS (ins->sreg1));
+ MONO_EMIT_NEW_UNALU (cfg, OP_MOVE, MONO_LVREG_MS (ins->dreg), MONO_LVREG_MS (ins->sreg1));
+ } else if (ins->inst_c1 > 32) {
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHL_IMM, MONO_LVREG_MS (ins->dreg), MONO_LVREG_LS (ins->sreg1), ins->inst_c1 - 32);
+ MONO_EMIT_NEW_ICONST (cfg, MONO_LVREG_LS (ins->dreg), 0);
+ } else {
+ guint32 tmpreg = alloc_ireg (cfg);
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHR_UN_IMM, tmpreg, MONO_LVREG_LS (ins->sreg1), 32 - ins->inst_c1);
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHL_IMM, MONO_LVREG_MS (ins->dreg), MONO_LVREG_MS (ins->sreg1), ins->inst_c1);
+ MONO_EMIT_NEW_BIALU_IMM (cfg, OP_ISHL_IMM, MONO_LVREG_LS (ins->dreg), MONO_LVREG_LS (ins->sreg1), ins->inst_c1);
+ MONO_EMIT_NEW_BIALU (cfg, OP_IOR, MONO_LVREG_MS (ins->dreg), MONO_LVREG_MS (ins->dreg), tmpreg);
+ allocated_vregs = TRUE;
+ }
+ break;
+ }
+#endif
+
+ default:
+ break;
+ }
+
+ *spec = INS_INFO (ins->opcode);
+ return allocated_vregs;
+}
+
/*
* mono_local_cprop:
*
void
mono_local_cprop (MonoCompile *cfg)
{
- MonoBasicBlock *bb;
+ MonoBasicBlock *bb, *bb_opt;
MonoInst **defs;
gint32 *def_index;
int max;
int filter = FILTER_IL_SEQ_POINT;
-
-restart:
+ int initial_max_vregs = cfg->next_vreg;
max = cfg->next_vreg;
- defs = (MonoInst **)mono_mempool_alloc (cfg->mempool, sizeof (MonoInst*) * (cfg->next_vreg + 1));
- def_index = (gint32 *)mono_mempool_alloc (cfg->mempool, sizeof (guint32) * (cfg->next_vreg + 1));
+ defs = (MonoInst **)mono_mempool_alloc (cfg->mempool, sizeof (MonoInst*) * cfg->next_vreg);
+ def_index = (gint32 *)mono_mempool_alloc (cfg->mempool, sizeof (guint32) * cfg->next_vreg);
+ cfg->cbb = bb_opt = mono_mempool_alloc0 ((cfg)->mempool, sizeof (MonoBasicBlock));
for (bb = cfg->bb_entry; bb; bb = bb->next_bb) {
MonoInst *ins;
int sregs [MONO_MAX_SRC_REGS];
int num_sregs, i;
- if ((ins->dreg != -1) && (ins->dreg < max)) {
- defs [ins->dreg] = NULL;
+ if (ins->dreg != -1) {
#if SIZEOF_REGISTER == 4
- defs [ins->dreg + 1] = NULL;
+ const char *spec = INS_INFO (ins->opcode);
+ if (spec [MONO_INST_DEST] == 'l') {
+ defs [ins->dreg + 1] = NULL;
+ defs [ins->dreg + 2] = NULL;
+ }
#endif
+ defs [ins->dreg] = NULL;
}
num_sregs = mono_inst_get_src_registers (ins, sregs);
for (i = 0; i < num_sregs; ++i) {
int sreg = sregs [i];
- if (sreg < max) {
- defs [sreg] = NULL;
#if SIZEOF_REGISTER == 4
+ const char *spec = INS_INFO (ins->opcode);
+ if (spec [MONO_INST_SRC1 + i] == 'l') {
defs [sreg + 1] = NULL;
-#endif
+ defs [sreg + 2] = NULL;
}
+#endif
+ defs [sreg] = NULL;
}
}
(!defs [def->sreg1] || (def_index [def->sreg1] < def_index [sreg]))) {
/* Avoid needless sign extension */
ins->sreg1 = def->sreg1;
+ } else if (ins->opcode == OP_COMPARE_IMM && def->opcode == OP_LDADDR && ins->inst_imm == 0) {
+ MonoInst dummy_arg1;
+
+ memset (&dummy_arg1, 0, sizeof (MonoInst));
+ dummy_arg1.opcode = OP_ICONST;
+ dummy_arg1.inst_c0 = 1;
+
+ mono_constant_fold_ins (cfg, ins, &dummy_arg1, NULL, TRUE);
}
}
+ g_assert (cfg->cbb == bb_opt);
+ g_assert (!bb_opt->code);
/* Do strength reduction here */
- /* FIXME: Add long/float */
- switch (ins->opcode) {
- case OP_MOVE:
- case OP_XMOVE:
- if (ins->dreg == ins->sreg1) {
- MONO_DELETE_INS (bb, ins);
- spec = INS_INFO (ins->opcode);
- }
- break;
- case OP_ADD_IMM:
- case OP_IADD_IMM:
- case OP_SUB_IMM:
- case OP_ISUB_IMM:
-#if SIZEOF_REGISTER == 8
- case OP_LADD_IMM:
- case OP_LSUB_IMM:
-#endif
- if (ins->inst_imm == 0) {
- ins->opcode = OP_MOVE;
- spec = INS_INFO (ins->opcode);
- }
- break;
- case OP_MUL_IMM:
- case OP_IMUL_IMM:
-#if SIZEOF_REGISTER == 8
- case OP_LMUL_IMM:
-#endif
- if (ins->inst_imm == 0) {
- ins->opcode = (ins->opcode == OP_LMUL_IMM) ? OP_I8CONST : OP_ICONST;
- ins->inst_c0 = 0;
- ins->sreg1 = -1;
- } else if (ins->inst_imm == 1) {
- ins->opcode = OP_MOVE;
- } else if ((ins->opcode == OP_IMUL_IMM) && (ins->inst_imm == -1)) {
- ins->opcode = OP_INEG;
- } else if ((ins->opcode == OP_LMUL_IMM) && (ins->inst_imm == -1)) {
- ins->opcode = OP_LNEG;
- } else {
- int power2 = mono_is_power_of_two (ins->inst_imm);
- if (power2 >= 0) {
- ins->opcode = (ins->opcode == OP_MUL_IMM) ? OP_SHL_IMM : ((ins->opcode == OP_LMUL_IMM) ? OP_LSHL_IMM : OP_ISHL_IMM);
- ins->inst_imm = power2;
- }
- }
- spec = INS_INFO (ins->opcode);
- break;
- case OP_IREM_UN_IMM:
- case OP_IDIV_UN_IMM: {
- int c = ins->inst_imm;
- int power2 = mono_is_power_of_two (c);
-
- if (power2 >= 0) {
- if (ins->opcode == OP_IREM_UN_IMM) {
- ins->opcode = OP_IAND_IMM;
- ins->sreg2 = -1;
- ins->inst_imm = (1 << power2) - 1;
- } else if (ins->opcode == OP_IDIV_UN_IMM) {
- ins->opcode = OP_ISHR_UN_IMM;
- ins->sreg2 = -1;
- ins->inst_imm = power2;
- }
- }
- spec = INS_INFO (ins->opcode);
- break;
- }
- case OP_IDIV_IMM: {
- int c = ins->inst_imm;
- int power2 = mono_is_power_of_two (c);
- MonoInst *tmp1, *tmp2, *tmp3, *tmp4;
-
- /* FIXME: Move this elsewhere cause its hard to implement it here */
- if (power2 == 1) {
- int r1 = mono_alloc_ireg (cfg);
-
- NEW_BIALU_IMM (cfg, tmp1, OP_ISHR_UN_IMM, r1, ins->sreg1, 31);
- mono_bblock_insert_after_ins (bb, ins, tmp1);
- NEW_BIALU (cfg, tmp2, OP_IADD, r1, r1, ins->sreg1);
- mono_bblock_insert_after_ins (bb, tmp1, tmp2);
- NEW_BIALU_IMM (cfg, tmp3, OP_ISHR_IMM, ins->dreg, r1, 1);
- mono_bblock_insert_after_ins (bb, tmp2, tmp3);
-
- NULLIFY_INS (ins);
-
- // We allocated a new vreg, so need to restart
- goto restart;
- } else if (power2 > 0 && power2 < 31) {
- int r1 = mono_alloc_ireg (cfg);
-
- NEW_BIALU_IMM (cfg, tmp1, OP_ISHR_IMM, r1, ins->sreg1, 31);
- mono_bblock_insert_after_ins (bb, ins, tmp1);
- NEW_BIALU_IMM (cfg, tmp2, OP_ISHR_UN_IMM, r1, r1, (32 - power2));
- mono_bblock_insert_after_ins (bb, tmp1, tmp2);
- NEW_BIALU (cfg, tmp3, OP_IADD, r1, r1, ins->sreg1);
- mono_bblock_insert_after_ins (bb, tmp2, tmp3);
- NEW_BIALU_IMM (cfg, tmp4, OP_ISHR_IMM, ins->dreg, r1, power2);
- mono_bblock_insert_after_ins (bb, tmp3, tmp4);
-
- NULLIFY_INS (ins);
-
- // We allocated a new vreg, so need to restart
- goto restart;
- }
- break;
+ if (mono_strength_reduction_ins (cfg, ins, &spec) && max < cfg->next_vreg) {
+ MonoInst **defs_prev = defs;
+ gint32 *def_index_prev = def_index;
+ guint32 prev_max = max;
+ guint32 additional_vregs = cfg->next_vreg - initial_max_vregs;
+
+ /* We have more vregs so we need to reallocate defs and def_index arrays */
+ max = initial_max_vregs + additional_vregs * 2;
+ defs = (MonoInst **)mono_mempool_alloc (cfg->mempool, sizeof (MonoInst*) * max);
+ def_index = (gint32 *)mono_mempool_alloc (cfg->mempool, sizeof (guint32) * max);
+
+ /* Keep the entries for the previous vregs, zero the rest */
+ memcpy (defs, defs_prev, sizeof (MonoInst*) * prev_max);
+ memset (defs + prev_max, 0, sizeof (MonoInst*) * (max - prev_max));
+ memcpy (def_index, def_index_prev, sizeof (guint32) * prev_max);
+ memset (def_index + prev_max, 0, sizeof (guint32) * (max - prev_max));
}
+
+ if (cfg->cbb->code || (cfg->cbb != bb_opt)) {
+ MonoInst *saved_prev = ins->prev;
+
+ /* If we have code in cbb, we need to replace ins with the decomposition */
+ mono_replace_ins (cfg, bb, ins, &ins->prev, bb_opt, cfg->cbb);
+ bb_opt->code = bb_opt->last_ins = NULL;
+ bb_opt->in_count = bb_opt->out_count = 0;
+ cfg->cbb = bb_opt;
+
+ /* ins is hanging, continue scanning the emitted code */
+ ins = saved_prev;
+ continue;
}
-
+
if (spec [MONO_INST_DEST] != ' ') {
MonoInst *def = defs [ins->dreg];
ins->inst_destbasereg = def->sreg1;
ins->inst_offset += def->inst_imm;
}
+
+ if (!MONO_IS_STORE_MEMBASE (ins) && !vreg_is_volatile (cfg, ins->dreg)) {
+ defs [ins->dreg] = ins;
+ def_index [ins->dreg] = ins_index;
+ }
}
- if ((spec [MONO_INST_DEST] != ' ') && !MONO_IS_STORE_MEMBASE (ins) && !vreg_is_volatile (cfg, ins->dreg)) {
- defs [ins->dreg] = ins;
- def_index [ins->dreg] = ins_index;
- }
-
if (MONO_IS_CALL (ins))
last_call_index = ins_index;
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