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glibc/SOURCES/glibc-RHEL-15696-79.patch

41 lines
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From 1b0c60f95bbe2eded80b2bb5be75c0e45b11cde1 Mon Sep 17 00:00:00 2001
From: Noah Goldstein <goldstein.w.n@gmail.com>
Date: Mon, 7 Feb 2022 00:32:23 -0600
Subject: [PATCH] x86: Remove SSSE3 instruction for broadcast in memset.S (SSE2
Only)
Content-type: text/plain; charset=UTF-8
commit b62ace2740a106222e124cc86956448fa07abf4d
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.
---
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; \
--
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