Re: [PATCH] x86: Skip EXT_REX_SSE_REG_P for vzeroupper optimization

2020-06-22 Thread Richard Biener via Gcc-patches
On Sun, Jun 21, 2020 at 1:06 AM H.J. Lu via Gcc-patches wrote: > > Skip EXT_REX_SSE_REG_P for vzeroupper optimization since upper 16 vector > registers don't trigger SSE <-> AVX transition penalty. OK. Richard. > gcc/ > > PR target/95791 > * config/i386/i386.c (ix86_dirflag_mode

[PATCH] x86: Skip EXT_REX_SSE_REG_P for vzeroupper optimization

2020-06-20 Thread H.J. Lu via Gcc-patches
Skip EXT_REX_SSE_REG_P for vzeroupper optimization since upper 16 vector registers don't trigger SSE <-> AVX transition penalty. gcc/ PR target/95791 * config/i386/i386.c (ix86_dirflag_mode_needed): Skip EXT_REX_SSE_REG_P. gcc/testsuite/ PR target/95791 *