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commit f2413f2710d5d5cc884b413b83fcf8198e3717fa
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Author: H.J. Lu <hjl.tools@gmail.com>
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Date: Sat Aug 28 06:10:38 2021 -0700
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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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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 9f02624375c07b26..abde8438d41f2320 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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