re PR middle-end/28796 (__builtin_nan() and __builtin_unordered() inconsistent)

2006-10-21  Richard Guenther  <rguenther@suse.de>

	PR middle-end/28796
	* simplify-rtx.c (simplify_const_relational_operation):
	Do not constant-fold ORDERED and UNORDERED for
	flag_unsafe_math_optimizations but only we do not need to
	honor NaNs for the given mode.

From-SVN: r117928

gcc/ChangeLog

 2006-10-21  Richard Guenther  <rguenther@suse.de>
 
+	PR middle-end/28796
+	* simplify-rtx.c (simplify_const_relational_operation):
+	Do not constant-fold ORDERED and UNORDERED for
+	flag_unsafe_math_optimizations but only we do not need to
+	honor NaNs for the given mode.
+
+2006-10-21  Richard Guenther  <rguenther@suse.de>
+
 	PR target/29512
 	* config/i386/i386.c (classify_argument): Remove redundant
 	walking of the BINFOs.

gcc/simplify-rtx.c

@@ -3747,10 +3747,10 @@ simplify_const_relational_operation (enum rtx_code code,
     return simplify_const_relational_operation (signed_condition (code),
 						mode, tem, const0_rtx);
 
-  if (flag_unsafe_math_optimizations && code == ORDERED)
+  if (! HONOR_NANS (mode) && code == ORDERED)
     return const_true_rtx;
 
-  if (flag_unsafe_math_optimizations && code == UNORDERED)
+  if (! HONOR_NANS (mode) && code == UNORDERED)
     return const0_rtx;
 
   /* For modes without NaNs, if the two operands are equal, we know the