middle-end/103193 - avoid canonicalizing <= and >= to == for floats

This avoids doing aforementioned canoncalization when -ftrapping-math
is in effect and we honor NaNs.

2021-11-15  Richard Biener  <rguenther@suse.de>

	PR middle-end/103193
	* match.pd: Avoid canonicalizing (le/ge @0 @0) to (eq @0 @0)
	with NaNs and -ftrapping-math.

diff --git a/gcc/match.pd b/gcc/match.pd
index 3e54e2c..5adcd6b 100644 (file)
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -4671,7 +4671,10 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
   (if (! FLOAT_TYPE_P (TREE_TYPE (@0))
        || ! HONOR_NANS (@0))
    { constant_boolean_node (true, type); }
-   (if (cmp != EQ_EXPR)
+   (if (cmp != EQ_EXPR
+       /* With -ftrapping-math conversion to EQ loses an exception.  */
+       && (! FLOAT_TYPE_P (TREE_TYPE (@0))
+           || ! flag_trapping_math))
     (eq @0 @0)))))
 (for cmp (ne gt lt)
  (simplify