re PR tree-optimization/49539 (ICE building gnattools)

	PR tree-optimization/49539
	* tree-ssa-forwprop.c (can_propagate_from): Check for abnormal SSA
	names by means of stmt_references_abnormal_ssa_name.
	(associate_plusminus): Call can_propagate_from before propagating
	from definition statements.
	(ssa_forward_propagate_and_combine): Remove superfluous newline.

From-SVN: r175650

gcc/ChangeLog

+2011-06-29  Eric Botcazou  <ebotcazou@adacore.com>
+
+	PR tree-optimization/49539
+	* tree-ssa-forwprop.c (can_propagate_from): Check for abnormal SSA
+	names by means of stmt_references_abnormal_ssa_name.
+	(associate_plusminus): Call can_propagate_from before propagating
+	from definition statements.
+	(ssa_forward_propagate_and_combine): Remove superfluous newline.
+
 2011-06-29  Richard Guenther  <rguenther@suse.de>
 
 	* doc/invoke.texi: Document -scev dump modifier.
@@ -963,7 +972,7 @@
 
 2011-06-20  Changpeng Fang  <changpeng.fang@amd.com>
 
-	PR i386/49089
+	PR target/49089
 	* config/i386/i386.c (avx256_split_unaligned_load): New definition.
 	(avx256_split_unaligned_store): New definition.
 	(ix86_option_override_internal): Enable avx256 unaligned load/store

gcc/tree-ssa-forwprop.c

@@ -260,9 +260,6 @@ get_prop_source_stmt (tree name, bool single_use_only, bool *single_use_p)
 static bool
 can_propagate_from (gimple def_stmt)
 {
-  use_operand_p use_p;
-  ssa_op_iter iter;
-
   gcc_assert (is_gimple_assign (def_stmt));
 
   /* If the rhs has side-effects we cannot propagate from it.  */
@@ -280,9 +277,8 @@ can_propagate_from (gimple def_stmt)
     return true;
 
   /* We cannot propagate ssa names that occur in abnormal phi nodes.  */
-  FOR_EACH_SSA_USE_OPERAND (use_p, def_stmt, iter, SSA_OP_USE)
-    if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (USE_FROM_PTR (use_p)))
-      return false;
+  if (stmt_references_abnormal_ssa_name (def_stmt))
+    return false;
 
   /* If the definition is a conversion of a pointer to a function type,
      then we can not apply optimizations as some targets require
@@ -1803,7 +1799,8 @@ associate_plusminus (gimple stmt)
 	{
 	  gimple def_stmt = SSA_NAME_DEF_STMT (rhs2);
 	  if (is_gimple_assign (def_stmt)
-	      && gimple_assign_rhs_code (def_stmt) == NEGATE_EXPR)
+	      && gimple_assign_rhs_code (def_stmt) == NEGATE_EXPR
+	      && can_propagate_from (def_stmt))
 	    {
 	      code = (code == MINUS_EXPR) ? PLUS_EXPR : MINUS_EXPR;
 	      gimple_assign_set_rhs_code (stmt, code);
@@ -1820,7 +1817,8 @@ associate_plusminus (gimple stmt)
 	{
 	  gimple def_stmt = SSA_NAME_DEF_STMT (rhs1);
 	  if (is_gimple_assign (def_stmt)
-	      && gimple_assign_rhs_code (def_stmt) == NEGATE_EXPR)
+	      && gimple_assign_rhs_code (def_stmt) == NEGATE_EXPR
+	      && can_propagate_from (def_stmt))
 	    {
 	      code = MINUS_EXPR;
 	      gimple_assign_set_rhs_code (stmt, code);
@@ -1863,7 +1861,7 @@ associate_plusminus (gimple stmt)
   if (TREE_CODE (rhs1) == SSA_NAME)
     {
       gimple def_stmt = SSA_NAME_DEF_STMT (rhs1);
-      if (is_gimple_assign (def_stmt))
+      if (is_gimple_assign (def_stmt) && can_propagate_from (def_stmt))
 	{
 	  enum tree_code def_code = gimple_assign_rhs_code (def_stmt);
 	  if (def_code == PLUS_EXPR
@@ -1963,7 +1961,7 @@ associate_plusminus (gimple stmt)
   if (rhs2 && TREE_CODE (rhs2) == SSA_NAME)
     {
       gimple def_stmt = SSA_NAME_DEF_STMT (rhs2);
-      if (is_gimple_assign (def_stmt))
+      if (is_gimple_assign (def_stmt) && can_propagate_from (def_stmt))
 	{
 	  enum tree_code def_code = gimple_assign_rhs_code (def_stmt);
 	  if (def_code == PLUS_EXPR
@@ -2285,8 +2283,7 @@ ssa_forward_propagate_and_combine (void)
 	      else
 		gsi_next (&gsi);
 	    }
-	  else if (code == POINTER_PLUS_EXPR
-		   && can_propagate_from (stmt))
+	  else if (code == POINTER_PLUS_EXPR && can_propagate_from (stmt))
 	    {
 	      if (TREE_CODE (gimple_assign_rhs2 (stmt)) == INTEGER_CST
 		  /* ???  Better adjust the interface to that function