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[Bug middle-end/58564] [4.7/4.8/4.9 Regression] possible wrong code bug at -O0
- 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: Mon, 30 Sep 2013 09:56:00 +0000
- Subject: [Bug middle-end/58564] [4.7/4.8/4.9 Regression] possible wrong code bug at -O0
- Auto-submitted: auto-generated
- References: <bug-58564-4 at http dot gcc dot gnu dot org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58564
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 30933
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30933&action=edit
gcc49-pr58564-nonnegative.patch
Actually, teaching fold that it should fold that < 0 into 0 is easy, just needs
making some checks less strict (they were considering only INTEGER_TYPE,
forgetting about BOOLEAN_TYPE or ENUMERAL_TYPE which IMHO can be handled the
same). This latter patch I'm obviously not going to propose for the older
branches.