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[Bug bootstrap/66801] [6 Regression] gcc miscompiled during PGO/LTO bootstrap
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 08 Jul 2015 12:22:52 +0000
- Subject: [Bug bootstrap/66801] [6 Regression] gcc miscompiled during PGO/LTO bootstrap
- Auto-submitted: auto-generated
- References: <bug-66801-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66801
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Ok, so the only code-gen difference possible is due to match.pd patterns
applying/not applying because of the changed iteration order making lattice
values final at different times.
Thus I suspect a latent bug in a match.pd pattern. Which means to possibly
"bisect" those?
I'm now first trying to reproduce.