[Bug tree-optimization/62035] [4.9/4.10 Regression] wrong code building libapache-mod-perl with -O1, works with -O1 -fno-tree-dse

[glisse at gcc dot gnu.org]

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.