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From 7af32e1d2ba4a5a98a2033bf18de200912ae90a2 Mon Sep 17 00:00:00 2001
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From: "H.J. Lu" <hjl.tools@gmail.com>
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Date: Sat, 28 Aug 2021 06:10:38 -0700
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Subject: [PATCH] x86-64: Use testl to check __x86_string_control
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Use testl, instead of andl, to check __x86_string_control to avoid
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updating __x86_string_control.
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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(cherry picked from commit 3c8b9879cab6d41787bc5b14c1748f62fd6d0e5f)
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---
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sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
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index 0469bf99..c0809b1b 100644
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--- a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
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+++ b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
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@@ -325,7 +325,7 @@ L(movsb):
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/* Avoid slow backward REP MOVSB. */
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jb L(more_8x_vec_backward)
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# if AVOID_SHORT_DISTANCE_REP_MOVSB
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- andl $X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB, __x86_string_control(%rip)
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+ testl $X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB, __x86_string_control(%rip)
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jz 3f
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movq %rdi, %rcx
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subq %rsi, %rcx
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@@ -333,7 +333,7 @@ L(movsb):
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# endif
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1:
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# if AVOID_SHORT_DISTANCE_REP_MOVSB
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- andl $X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB, __x86_string_control(%rip)
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+ testl $X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB, __x86_string_control(%rip)
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jz 3f
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movq %rsi, %rcx
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subq %rdi, %rcx
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--
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GitLab
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