https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103861
--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Uros Bizjak <u...@gcc.gnu.org>: https://gcc.gnu.org/g:820ac79e8448ad6c631e1387ba51a93dcf2b4e89 commit r12-6488-g820ac79e8448ad6c631e1387ba51a93dcf2b4e89 Author: Uros Bizjak <ubiz...@gmail.com> Date: Tue Jan 11 19:23:15 2022 +0100 i386: Introduce V2QImode vector cmove for -msse4.1 [PR103861] This patch also moves V2HI and V4QImode vector conditional moves to SSE4.1 targets. Vector cmoves are implemented with SSE logic functions without -msse4.1, and they are hardly worthwile for narrow vector modes. More important, we would like to keep vector logic functions for GPR registers, and the current RTX description of 32-bit vector modes logic insns does not include the necessary CC reg clobber. Solve these issues by restricting vector cmove insns for these modes to -msse4.1, where logic instructions are avoided, and pblend insn is used instead. A follow-up patch will add clobbers and necessary splits to 32-bit vector mode logic insns, and in a future patch, ix86_sse_movcc will be improved to use expand_simple_{unop,binop} to emit logic insns, allowing us to re-enable 16-bit and 32-bit narrow vector cmoves for -msse2. 2022-01-11 Uroš Bizjak <ubiz...@gmail.com> gcc/ChangeLog: PR target/103861 * config/i386/mmx.md (vcond<mode><mode>): Use VI_16_32 mode iterator. Enable for TARGET_SSE4_1. (vcondu<mode><mode>): Ditto. (vcond_mask_<mode><mode>): Ditto. (mmx_pblendvb_v8qi): Rename from mmx_pblendvb64. (mmx_pblendvb_<mode>): Rename from mmx_pblendvb32. Use VI_16_32 mode iterator. * config/i386/i386-expand.c (ix86_expand_sse_movcc): Update for rename. Handle V2QImode. (expand_vec_perm_blend): Update for rename. gcc/testsuite/ChangeLog: PR target/103861 * g++.target/i386/pr100637-1b.C (dg-options): Use -msse4 instead of -msse2. * g++.target/i386/pr100637-1w.C (dg-options): Ditto. * g++.target/i386/pr103861-1.C: New test. * gcc.target/i386/pr100637-4b.c (dg-options): Use -msse4 instead of -msse2. * gcc.target/i386/pr103861-4.c: New test.
