From 4412c21a9027bbe6546b2a329a741d26c2477136 Mon Sep 17 00:00:00 2001 From: Noah Goldstein Date: Mon, 7 Feb 2022 00:32:23 -0600 Subject: [PATCH] x86: Remove SSSE3 instruction for broadcast in memset.S (SSE2 Only) commit b62ace2740a106222e124cc86956448fa07abf4d Author: Noah Goldstein Date: Sun Feb 6 00:54:18 2022 -0600 x86: Improve vec generation in memset-vec-unaligned-erms.S Revert usage of 'pshufb' in broadcast logic as it is an SSSE3 instruction and memset.S is restricted to only SSE2 instructions. (cherry picked from commit 1b0c60f95bbe2eded80b2bb5be75c0e45b11cde1) --- sysdeps/x86_64/memset.S | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/sysdeps/x86_64/memset.S b/sysdeps/x86_64/memset.S index 27debd2b..4cb4aa71 100644 --- a/sysdeps/x86_64/memset.S +++ b/sysdeps/x86_64/memset.S @@ -30,9 +30,10 @@ # define MEMSET_SET_VEC0_AND_SET_RETURN(d, r) \ movd d, %xmm0; \ - pxor %xmm1, %xmm1; \ - pshufb %xmm1, %xmm0; \ - movq r, %rax + movq r, %rax; \ + punpcklbw %xmm0, %xmm0; \ + punpcklwd %xmm0, %xmm0; \ + pshufd $0, %xmm0, %xmm0 # define WMEMSET_SET_VEC0_AND_SET_RETURN(d, r) \ movd d, %xmm0; \ -- GitLab