https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95791
--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by H.J. Lu <h...@gcc.gnu.org>: https://gcc.gnu.org/g:9302421e71e85b4d3766a534ed9e1c4ae1e7a6ca commit r11-1585-g9302421e71e85b4d3766a534ed9e1c4ae1e7a6ca Author: H.J. Lu <hjl.to...@gmail.com> Date: Sat Jun 20 16:02:42 2020 -0700 x86: Skip EXT_REX_SSE_REG_P for vzeroupper optimization 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 * gcc.target/i386/pr95791.c: New test.
