X-Git-Url: http://wien.tomnetworks.com/gitweb/?a=blobdiff_plain;f=mono%2Fmini%2Fssa.c;h=d58d814e11fb0685d48c275cc497a968b8ab034a;hb=0d40321933ac575314ab51efa3c62e8cf535a9d2;hp=df6d69ff167bdbec702ad6404a5444b8a40c3f8a;hpb=7bd0a7c7f857a2613876c09b061c8fac5ccb5da1;p=mono.git

diff --git a/mono/mini/ssa.c b/mono/mini/ssa.c
index df6d69ff167..d58d814e11f 100644
--- a/mono/mini/ssa.c
+++ b/mono/mini/ssa.c
@@ -5,6 +5,7 @@
  *    Dietmar Maurer (dietmar@ximian.com)
  *
  * (C) 2003 Ximian, Inc.
+ * Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
  */
 #include <config.h>
 #include <string.h>
@@ -268,7 +269,7 @@ mono_ssa_rename_vars (MonoCompile *cfg, int max_vars, MonoBasicBlock *bb, gboole
 			}
 			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
@@ -340,8 +341,6 @@ mono_ssa_compute (MonoCompile *cfg)
 
 	g_assert (!(cfg->comp_done & MONO_COMP_SSA));
 
-	/* we dont support methods containing exception clauses */
-	g_assert (mono_method_get_header (cfg->method)->num_clauses == 0);
 	g_assert (!cfg->disable_ssa);
 
 	if (cfg->verbose_level >= 4)
@@ -485,7 +484,7 @@ void
 mono_ssa_remove (MonoCompile *cfg)
 {
 	MonoInst *ins, *var, *move;
-	int i, j, first;
+	int bbindex, i, j, first;
 
 	g_assert (cfg->comp_done & MONO_COMP_SSA);
 
@@ -553,12 +552,12 @@ mono_ssa_remove (MonoCompile *cfg)
 	 * can coalesce them into the original variable.
 	 */
 
-	for (i = 0; i < cfg->num_bblocks; ++i) {
-		MonoBasicBlock *bb = cfg->bblocks [i];
+	for (bbindex = 0; bbindex < cfg->num_bblocks; ++bbindex) {
+		MonoBasicBlock *bb = cfg->bblocks [bbindex];
 
 		for (ins = bb->code; ins; ins = ins->next) {
 			const char *spec = INS_INFO (ins->opcode);
-			int num_sregs, j;
+			int num_sregs;
 			int sregs [MONO_MAX_SRC_REGS];
 
 			if (ins->opcode == OP_NOP)
@@ -582,7 +581,7 @@ mono_ssa_remove (MonoCompile *cfg)
 			}
 
 			num_sregs = mono_inst_get_src_registers (ins, sregs);
-			for (j = 0; j < num_sregs; ++j) {
+			for (i = 0; i < num_sregs; ++i) {
 				MonoInst *var = get_vreg_to_inst (cfg, sregs [i]);
 
 				if (var) {
@@ -685,7 +684,6 @@ mono_ssa_copyprop (MonoCompile *cfg)
 				/* 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) {
@@ -695,8 +693,6 @@ mono_ssa_copyprop (MonoCompile *cfg)
 					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)
@@ -1109,7 +1105,7 @@ fold_ins (MonoCompile *cfg, MonoBasicBlock *bb, MonoInst *ins, MonoInst **carray
 
 				/* 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]);
 					}
@@ -1168,6 +1164,15 @@ mono_ssa_cprop (MonoCompile *cfg)
 			info->cpstate = 2;
 	}
 
+	for (bb = cfg->bb_entry->next_bb; bb; bb = bb->next_bb) {
+		/*
+		 * FIXME: This should be bb->flags & BB_FLAG_EXCEPTION_HANDLER, but
+		 * that would still allow unreachable try's to be removed.
+		 */
+		if (bb->region)
+			add_cprop_bb (cfg, bb, &bblock_list);
+	}
+
 	cvars = NULL;
 
 	while (bblock_list) {
@@ -1179,11 +1184,13 @@ mono_ssa_cprop (MonoCompile *cfg)
 
 		g_assert (bb->flags &  BB_REACHABLE);
 
-		if (bb->out_count == 1) {
-			if (!(bb->out_bb [0]->flags &  BB_REACHABLE)) {
-				bb->out_bb [0]->flags |= BB_REACHABLE;
-				bblock_list = g_list_prepend (bblock_list, bb->out_bb [0]);
-			}
+		/* 
+		 * Some bblocks are linked to 2 others even through they fall through to the
+		 * next bblock.
+		 */
+		if (!(bb->last_ins && MONO_IS_BRANCH_OP (bb->last_ins))) {
+			for (i = 0; i < bb->out_count; ++i)
+				add_cprop_bb (cfg, bb->out_bb [i], &bblock_list);
 		}
 
 		if (cfg->verbose_level > 1)