[PATCH][match-and-simplify] Some FP runtime fails

[Richard Biener]

Fixed with the following, committed.  Incidentially this is the
only constant folding pattern that also applies to floats - otherwise
the use of the integer_* predicates prevent that.

Richard.

2014-08-06  Richard Biener  <rguent...@suse.de>

        * match-constant-folding.pd (minus @0 @0): Restrict to
        modes without NaNs.

Index: gcc/match-constant-folding.pd
===================================================================
--- gcc/match-constant-folding.pd       (revision 213651)
+++ gcc/match-constant-folding.pd       (working copy)
@@ -24,6 +24,7 @@ along with GCC; see the file COPYING3.
 
 (simplify
   (minus @0 @0)
+  (if (!HONOR_NANS (TYPE_MODE (type))))
   { build_zero_cst (type); })
 
 (simplify