* Dietmar Maurer (dietmar@ximian.com)
*
* (C) 2003 Ximian, Inc.
+ * Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
*/
#include <config.h>
#include <string.h>
}
else if (G_UNLIKELY (!var && lvreg_defined [ins->dreg] && (ins->dreg >= MONO_MAX_IREGS))) {
/* Perform renaming for local vregs */
- lvreg_stack [ins->dreg] = mono_alloc_preg (cfg);
+ lvreg_stack [ins->dreg] = vreg_is_ref (cfg, ins->dreg) ? mono_alloc_ireg_ref (cfg) : mono_alloc_preg (cfg);
ins->dreg = lvreg_stack [ins->dreg];
}
else
/* Rewrite all uses of var to be uses of var2 */
int dreg = var->dreg;
int sreg1 = var2->dreg;
- const char *spec;
l = info->uses;
while (l) {
int num_sregs;
int sregs [MONO_MAX_SRC_REGS];
- spec = INS_INFO (ins->opcode);
-
num_sregs = mono_inst_get_src_registers (ins, sregs);
for (i = 0; i < num_sregs; ++i) {
if (sregs [i] == dreg)
/* Unlink target bblocks */
for (i = 0; i < table->table_size; ++i) {
- if (i != idx) {
+ if (table->table [i] != table->table [idx]) {
remove_bb_from_phis (cfg, bb, table->table [i]);
mono_unlink_bblock (cfg, bb, table->table [i]);
}
}
#endif
+void
+mono_ssa_loop_invariant_code_motion (MonoCompile *cfg)
+{
+ MonoBasicBlock *bb, *h, *idom;
+ MonoInst *ins, *n, *tins;
+ int i;
+
+ g_assert (cfg->comp_done & MONO_COMP_SSA);
+ if (!(cfg->comp_done & MONO_COMP_LOOPS) || !(cfg->comp_done & MONO_COMP_SSA_DEF_USE))
+ return;
+
+ for (bb = cfg->bb_entry->next_bb; bb; bb = bb->next_bb) {
+ GList *lp = bb->loop_blocks;
+
+ if (!lp)
+ continue;
+ h = (MonoBasicBlock *)lp->data;
+ if (bb != h)
+ continue;
+ MONO_BB_FOR_EACH_INS_SAFE (bb, n, ins) {
+ gboolean is_class_init = FALSE;
+
+ /*
+ * Try to move instructions out of loop headers into the preceeding bblock.
+ */
+ if (ins->opcode == OP_VOIDCALL) {
+ MonoCallInst *call = (MonoCallInst*)ins;
+
+ if (call->fptr_is_patch) {
+ MonoJumpInfo *ji = (MonoJumpInfo*)call->fptr;
+
+ if (ji->type == MONO_PATCH_INFO_CLASS_INIT)
+ is_class_init = TRUE;
+ }
+ }
+ if (ins->opcode == OP_LDLEN || ins->opcode == OP_STRLEN || ins->opcode == OP_CHECK_THIS || ins->opcode == OP_AOTCONST || is_class_init) {
+ gboolean skip;
+ int sreg;
+
+ idom = h->idom;
+ /*
+ * h->nesting is needed to work around:
+ * http://llvm.org/bugs/show_bug.cgi?id=17868
+ */
+ if (!(idom && idom->last_ins && idom->last_ins->opcode == OP_BR && idom->last_ins->inst_target_bb == h && h->nesting == 1)) {
+ continue;
+ }
+
+ /*
+ * Make sure there are no instructions with side effects before ins.
+ */
+ skip = FALSE;
+ MONO_BB_FOR_EACH_INS (bb, tins) {
+ if (tins == ins)
+ break;
+ if (!MONO_INS_HAS_NO_SIDE_EFFECT (tins)) {
+ skip = TRUE;
+ break;
+ }
+ }
+ if (skip) {
+ /*
+ printf ("%s\n", mono_method_full_name (cfg->method, TRUE));
+ mono_print_ins (tins);
+ */
+ continue;
+ }
+
+ /* Make sure we don't move the instruction before the def of its sreg */
+ if (ins->opcode == OP_LDLEN || ins->opcode == OP_STRLEN || ins->opcode == OP_CHECK_THIS)
+ sreg = ins->sreg1;
+ else
+ sreg = -1;
+ if (sreg != -1) {
+ MonoInst *tins, *var;
+
+ skip = FALSE;
+ for (tins = ins->prev; tins; tins = tins->prev) {
+ const char *spec = INS_INFO (tins->opcode);
+
+ if (tins->opcode == OP_MOVE && tins->dreg == sreg) {
+ sreg = tins->sreg1;
+ } if (spec [MONO_INST_DEST] != ' ' && tins->dreg == sreg) {
+ skip = TRUE;
+ break;
+ }
+ }
+ if (skip)
+ continue;
+ var = get_vreg_to_inst (cfg, sreg);
+ if (var && (var->flags & (MONO_INST_VOLATILE|MONO_INST_INDIRECT)))
+ continue;
+ ins->sreg1 = sreg;
+ }
+
+ if (cfg->verbose_level > 1) {
+ printf ("licm in BB%d on ", bb->block_num);
+ mono_print_ins (ins);
+ }
+ //{ static int count = 0; count ++; printf ("%d\n", count); }
+ MONO_REMOVE_INS (bb, ins);
+ mono_bblock_insert_before_ins (idom, idom->last_ins, ins);
+ if (ins->opcode == OP_LDLEN || ins->opcode == OP_STRLEN)
+ idom->has_array_access = TRUE;
+ }
+ }
+ }
+
+ cfg->comp_done &= ~MONO_COMP_SSA_DEF_USE;
+ for (i = 0; i < cfg->num_varinfo; i++) {
+ MonoMethodVar *info = MONO_VARINFO (cfg, i);
+ info->def = NULL;
+ info->uses = NULL;
+ }
+}
+
#endif /* DISABLE_JIT */
projects / mono.git / blobdiff