commit f2413f2710d5d5cc884b413b83fcf8198e3717fa
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sat Aug 28 06:10:38 2021 -0700

    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)

diff --git a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
index 9f02624375c07b26..abde8438d41f2320 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