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[Bug tree-optimization/62035] [4.9/4.10 Regression] wrong code building libapache-mod-perl with -O1, works with -O1 -fno-tree-dse
- From: "glisse at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sat, 09 Aug 2014 16:45:40 +0000
- Subject: [Bug tree-optimization/62035] [4.9/4.10 Regression] wrong code building libapache-mod-perl with -O1, works with -O1 -fno-tree-dse
- Auto-submitted: auto-generated
- References: <bug-62035-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62035
--- Comment #6 from Marc Glisse <glisse at gcc dot gnu.org> ---
[warning for this code]
>From the little I understand, a pass like PRE might be a possibility. The main
prerequisite would be to include clobbers in value numbering. That would
probably make us miss a few optimizations that would need to be implemented
differently.
Well, I clearly don't know what I am talking about so I'll leave this for now.