From 7af32e1d2ba4a5a98a2033bf18de200912ae90a2 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Sat, 28 Aug 2021 06:10:38 -0700
Subject: [PATCH] x86-64: Use testl to check __x86_string_control

Use testl, instead of andl, to check __x86_string_control to avoid
updating __x86_string_control.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit 3c8b9879cab6d41787bc5b14c1748f62fd6d0e5f)
---
 sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
index 0469bf99..c0809b1b 100644
--- a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
+++ b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
@@ -325,7 +325,7 @@ L(movsb):
 	/* Avoid slow backward REP MOVSB.  */
 	jb	L(more_8x_vec_backward)
 # if AVOID_SHORT_DISTANCE_REP_MOVSB
-	andl	$X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB, __x86_string_control(%rip)
+	testl	$X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB, __x86_string_control(%rip)
 	jz	3f
 	movq	%rdi, %rcx
 	subq	%rsi, %rcx
@@ -333,7 +333,7 @@ L(movsb):
 # endif
 1:
 # if AVOID_SHORT_DISTANCE_REP_MOVSB
-	andl	$X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB, __x86_string_control(%rip)
+	testl	$X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB, __x86_string_control(%rip)
 	jz	3f
 	movq	%rsi, %rcx
 	subq	%rdi, %rcx
-- 
GitLab