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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: Tue, 15 Dec 2015 20:32:32 +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 #6 from Marc Glisse <glisse at gcc dot gnu.org> ---
In addition to the issues already described, it seems that we generate better
code if I replace the VLAs with calls to alloca. Indeed, we assume that alloca
returns 16-aligned memory, while with __builtin_alloca_with_align(..., 64), we
don't seem to have code to turn it into __builtin_alloca_with_align(..., 128)
so we could avoid all the loop adjustment code.