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[Bug target/66369] gcc 4.8.3/5.1.0 miss optimisation with vpmovmskb
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 02 Jun 2015 09:05:25 +0000
- Subject: [Bug target/66369] gcc 4.8.3/5.1.0 miss optimisation with vpmovmskb
- Auto-submitted: auto-generated
- References: <bug-66369-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66369
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |x86_64-*-*, i?86-*-*
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
v = (long ) _mm256_movemask_epi8( _mm256_cmpeq_epi8(regchx256,regset256) );
isn't this because there maybe isn't an intrinsic producing a 64bit value?
If so the backend probably misses a pattern for it and thus combine doesn't
generate it.