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[Bug tree-optimization/49279] [4.5/4.6/4.7 Regression] Optimization incorrectly presuming constant variable inside loop in g++ 4.5 and 4.6 with -O2 and -O3 for x86_64 targets
- From: "jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 05 Oct 2011 08:09:24 +0000
- Subject: [Bug tree-optimization/49279] [4.5/4.6/4.7 Regression] Optimization incorrectly presuming constant variable inside loop in g++ 4.5 and 4.6 with -O2 and -O3 for x86_64 targets
- Auto-submitted: auto-generated
- References: <bug-49279-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49279
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-10-05 08:09:24 UTC ---
BTW, the extra problematic casts aren't coming from the frontend, it is the
gimplifier that is inserting them:
/* Insert pointer conversions required by the middle-end that are not
required by the frontend. This fixes middle-end type checking for
for example gcc.dg/redecl-6.c. */
if (POINTER_TYPE_P (TREE_TYPE (*to_p)))
{
STRIP_USELESS_TYPE_CONVERSION (*from_p);
if (!useless_type_conversion_p (TREE_TYPE (*to_p), TREE_TYPE (*from_p)))
*from_p = fold_convert_loc (loc, TREE_TYPE (*to_p), *from_p);
}