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commit 5732a881aad24fac876f5505a212395048a7a483
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Fri Jan 14 16:09:20 2022 +0100
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x86: HAVE_X86_LAHF_SAHF, HAVE_X86_MOVBE and -march=x86-64-vN (bug 28782)
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HAVE_X86_LAHF_SAHF is implied by x86-64-v2, and HAVE_X86_MOVBE by
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x86-64-v3.
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The individual flag does not appear in -fverbose-asm flag output
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even if the ISA level implies it.
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Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
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diff --git a/sysdeps/x86/configure b/sysdeps/x86/configure
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index 62676bb686850938..7bdbfdc6dc2ad38f 100644
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--- a/sysdeps/x86/configure
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+++ b/sysdeps/x86/configure
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@@ -155,7 +155,7 @@ else
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(eval $ac_try) 2>&5
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ac_status=$?
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$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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- test $ac_status = 0; }; } | grep -q "\-msahf"; then
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+ test $ac_status = 0; }; } | grep -qE '(-msahf\b|-march=x86-64-v)'; then
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libc_cv_have_x86_lahf_sahf=yes
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fi
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fi
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@@ -176,7 +176,7 @@ else
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(eval $ac_try) 2>&5
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ac_status=$?
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$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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- test $ac_status = 0; }; } | grep -q "\-mmovbe"; then
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+ test $ac_status = 0; }; } | grep -qE '(-mmovbe\b|-march=x86-64-v([3-9]|[1-9][0-9]))'; then
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libc_cv_have_x86_movbe=yes
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fi
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fi
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diff --git a/sysdeps/x86/configure.ac b/sysdeps/x86/configure.ac
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index 04a12ab68048cd66..10d5c2e0e555fc79 100644
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--- a/sysdeps/x86/configure.ac
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+++ b/sysdeps/x86/configure.ac
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@@ -110,7 +110,7 @@ if test $libc_cv_include_x86_isa_level = yes; then
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AC_CACHE_CHECK([for LAHF/SAHF instruction support],
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libc_cv_have_x86_lahf_sahf, [dnl
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libc_cv_have_x86_lahf_sahf=no
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- if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -fverbose-asm -S -o - -x c /dev/null) | grep -q "\-msahf"; then
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+ if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -fverbose-asm -S -o - -x c /dev/null) | grep -qE '(-msahf\b|-march=x86-64-v)'; then
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libc_cv_have_x86_lahf_sahf=yes
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fi])
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if test $libc_cv_have_x86_lahf_sahf = yes; then
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@@ -119,7 +119,7 @@ if test $libc_cv_include_x86_isa_level = yes; then
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AC_CACHE_CHECK([for MOVBE instruction support],
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libc_cv_have_x86_movbe, [dnl
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libc_cv_have_x86_movbe=no
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- if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -fverbose-asm -S -o - -x c /dev/null) | grep -q "\-mmovbe"; then
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+ if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -fverbose-asm -S -o - -x c /dev/null) | grep -qE '(-mmovbe\b|-march=x86-64-v(@<:@3-9@:>@|@<:@1-9@:>@@<:@0-9@:>@))'; then
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libc_cv_have_x86_movbe=yes
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fi])
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if test $libc_cv_have_x86_movbe = yes; then
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