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[Bug tree-optimization/61619] Benefits from -ftree-vectorize lost easily when changing unrelated code
- 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: Thu, 26 Jun 2014 14:35:02 +0000
- Subject: [Bug tree-optimization/61619] Benefits from -ftree-vectorize lost easily when changing unrelated code
- Auto-submitted: auto-generated
- References: <bug-61619-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61619
--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #1)
> Unfortunately the inits look like
>
> [/usr/include/c++/4.9/bits/stl_algobase.h : 378:6] MEM[(char *
> {ref-all})&S] = MEM[(char * {ref-all})&._94];
> pretmp_22 = MEM[(struct array *)&S];
>
> which we don't fold to the constant init 1 for some reason.
Sounds related to PR 59611 (I didn't look at this one closely, so maybe not).