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[Bug rtl-optimization/67072] Slow code generated for getting each byte of a 64bit register as a LUT index.
- From: "peter at cordes dot ca" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 31 Jul 2015 01:08:58 +0000
- Subject: [Bug rtl-optimization/67072] Slow code generated for getting each byte of a 64bit register as a LUT index.
- Auto-submitted: auto-generated
- References: <bug-67072-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67072
--- Comment #3 from Peter Cordes <peter at cordes dot ca> ---
@Andrew Pinski: same code is generated with -march=sandybridge (-march=native
on Sandybridge). (Except of course the intrinsics use the VEX version.)
-mtune=intel doesn't help either.