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x86: Remove SSSE3 instruction for broadcast in memset.S (SSE2 Only)

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commit b62ace2740
Author: Noah Goldstein <goldstein.w.n@gmail.com>
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 1b0c60f95b)
This commit is contained in:
Noah Goldstein 2022-02-07 00:32:23 -06:00 committed by Sunil K Pandey
parent ea19c490a3
commit 190ea5f7e4
1 changed files with 4 additions and 3 deletions
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7
sysdeps/x86_64/memset.S
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@ -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; \