tree-eh.c (operation_could_trap_helper_p): Handle conversions like ordinary operations.

2014-11-03  Richard Biener  <rguenther@suse.de>

	* tree-eh.c (operation_could_trap_helper_p): Handle conversions
	like ordinary operations.
	* gimplify.c (gimplify_conversion): Gimplify CONVERT_EXPR
	as NOP_EXPR.

From-SVN: r217048

gcc/ChangeLog

+2014-11-03  Richard Biener  <rguenther@suse.de>
+
+	* tree-eh.c (operation_could_trap_helper_p): Handle conversions
+	like ordinary operations.
+	* gimplify.c (gimplify_conversion): Gimplify CONVERT_EXPR
+	as NOP_EXPR.
+
 2014-11-03  Joseph Myers  <joseph@codesourcery.com>
 
 	* configure.ac (TARGET_GLIBC_MAJOR, TARGET_GLIBC_MINOR): Define

gcc/gimplify.c

@@ -1739,6 +1739,10 @@ gimplify_conversion (tree *expr_p)
     *expr_p = fold_build1_loc (loc, VIEW_CONVERT_EXPR, TREE_TYPE (*expr_p),
 			       TREE_OPERAND (*expr_p, 0));
 
+  /* Canonicalize CONVERT_EXPR to NOP_EXPR.  */
+  if (TREE_CODE (*expr_p) == CONVERT_EXPR)
+    TREE_SET_CODE (*expr_p, NOP_EXPR);
+
   return GS_OK;
 }
 

gcc/tree-eh.c

@@ -2436,11 +2436,6 @@ operation_could_trap_helper_p (enum tree_code op,
     case UNEQ_EXPR:
       return honor_snans;
 
-    case CONVERT_EXPR:
-    case FIX_TRUNC_EXPR:
-      /* Conversion of floating point might trap.  */
-      return honor_nans;
-
     case NEGATE_EXPR:
     case ABS_EXPR:
     case CONJ_EXPR: