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[Bug tree-optimization/63185] Improve DSE with branches
- 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, 16 Oct 2014 13:03:25 +0000
- Subject: [Bug tree-optimization/63185] Improve DSE with branches
- Auto-submitted: auto-generated
- References: <bug-63185-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63185
--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #3)
> Btw, what was the original testcase?
Sorry, I don't remember. Probably something involving std::vector or
std::string. Since llvm optimizes it just fine, I hadn't realized it would be
so hard.
> That is, without making the walk very much more expensive there isn't
> anything we can do about this.
Ok, thanks for looking at it. Down to P5?