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Remove configure tests for -mno-vzeroupper support

From: Joseph Myers <joseph at codesourcery dot com>
To: <libc-alpha at sourceware dot org>
Date: Fri, 9 Oct 2015 15:38:05 +0000
Subject: Remove configure tests for -mno-vzeroupper support
Authentication-results: sourceware.org; auth=none

GCC added support for -mno-vzeroupper in version 4.6.  Thus the
configure tests for this support are obsolete, and this patch removes
them.

Tested for x86_64 and x86 (testsuite, and that installed stripped
shared libraries are unchanged by this patch).

2015-10-09  Joseph Myers  <joseph@codesourcery.com>

	* sysdeps/i386/configure.ac (libc_cv_cc_novzeroupper): Remove
	configure test.
	* sysdeps/i386/configure: Regenerated.
	* sysdeps/x86_64/configure.ac (libc_cv_cc_novzeroupper): Remove
	configure test.
	* sysdeps/x86_64/configure: Regenerated.
	* sysdeps/x86_64/Makefile [$(config-cflags-novzeroupper) = yes]:
	Make code unconditional.

diff --git a/sysdeps/i386/configure b/sysdeps/i386/configure
index bc22864..0abafe3 100644
--- a/sysdeps/i386/configure
+++ b/sysdeps/i386/configure
@@ -114,28 +114,6 @@ $as_echo "$libc_cv_as_i686" >&6; }
 config_vars="$config_vars
 config-asflags-i686 = $libc_cv_as_i686"
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for -mno-vzeroupper support" >&5
-$as_echo_n "checking for -mno-vzeroupper support... " >&6; }
-if ${libc_cv_cc_novzeroupper+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  if { ac_try='${CC-cc} -mno-vzeroupper -xc /dev/null -S -o /dev/null'
-  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; }; }; then :
-  libc_cv_cc_novzeroupper=yes
-else
-  libc_cv_cc_novzeroupper=no
-fi
-
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_novzeroupper" >&5
-$as_echo "$libc_cv_cc_novzeroupper" >&6; }
-config_vars="$config_vars
-config-cflags-novzeroupper = $libc_cv_cc_novzeroupper"
-
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for Intel MPX support" >&5
 $as_echo_n "checking for Intel MPX support... " >&6; }
 if ${libc_cv_asm_mpx+:} false; then :
diff --git a/sysdeps/i386/configure.ac b/sysdeps/i386/configure.ac
index c51530a..21b1c8f 100644
--- a/sysdeps/i386/configure.ac
+++ b/sysdeps/i386/configure.ac
@@ -42,14 +42,6 @@ LIBC_TRY_CC_OPTION([-Wa,-mtune=i686],
 ])
 LIBC_CONFIG_VAR([config-asflags-i686], [$libc_cv_as_i686])
 
-dnl Check if -mno-vzeroupper works.
-AC_CACHE_CHECK(for -mno-vzeroupper support, libc_cv_cc_novzeroupper, [dnl
-LIBC_TRY_CC_OPTION([-mno-vzeroupper],
-		   [libc_cv_cc_novzeroupper=yes],
-		   [libc_cv_cc_novzeroupper=no])
-])
-LIBC_CONFIG_VAR([config-cflags-novzeroupper], [$libc_cv_cc_novzeroupper])
-
 dnl Check whether asm supports Intel MPX
 AC_CACHE_CHECK(for Intel MPX support, libc_cv_asm_mpx, [dnl
 cat > conftest.s <<\EOF
diff --git a/sysdeps/x86_64/Makefile b/sysdeps/x86_64/Makefile
index 099792d..67ed5ba 100644
--- a/sysdeps/x86_64/Makefile
+++ b/sysdeps/x86_64/Makefile
@@ -81,10 +81,7 @@ $(objpfx)tst-audit10: $(objpfx)tst-auditmod10a.so
 $(objpfx)tst-audit10.out: $(objpfx)tst-auditmod10b.so
 tst-audit10-ENV = LD_AUDIT=$(objpfx)tst-auditmod10b.so
 
-AVX-CFLAGS=-mavx
-ifeq (yes,$(config-cflags-novzeroupper))
-AVX-CFLAGS+=-mno-vzeroupper
-endif
+AVX-CFLAGS=-mavx -mno-vzeroupper
 CFLAGS-tst-audit4.c += $(AVX-CFLAGS)
 CFLAGS-tst-auditmod4a.c += $(AVX-CFLAGS)
 CFLAGS-tst-auditmod4b.c += $(AVX-CFLAGS)
diff --git a/sysdeps/x86_64/configure b/sysdeps/x86_64/configure
index 7176923..8d4d8b8 100644
--- a/sysdeps/x86_64/configure
+++ b/sysdeps/x86_64/configure
@@ -97,28 +97,6 @@ fi
 config_vars="$config_vars
 config-cflags-avx512 = $libc_cv_cc_avx512"
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for -mno-vzeroupper support" >&5
-$as_echo_n "checking for -mno-vzeroupper support... " >&6; }
-if ${libc_cv_cc_novzeroupper+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  if { ac_try='${CC-cc} -mno-vzeroupper -xc /dev/null -S -o /dev/null'
-  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; }; }; then :
-  libc_cv_cc_novzeroupper=yes
-else
-  libc_cv_cc_novzeroupper=no
-fi
-
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_novzeroupper" >&5
-$as_echo "$libc_cv_cc_novzeroupper" >&6; }
-config_vars="$config_vars
-config-cflags-novzeroupper = $libc_cv_cc_novzeroupper"
-
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for Intel MPX support" >&5
 $as_echo_n "checking for Intel MPX support... " >&6; }
 if ${libc_cv_asm_mpx+:} false; then :
diff --git a/sysdeps/x86_64/configure.ac b/sysdeps/x86_64/configure.ac
index 965ebc9..14b9580 100644
--- a/sysdeps/x86_64/configure.ac
+++ b/sysdeps/x86_64/configure.ac
@@ -30,14 +30,6 @@ if test $libc_cv_cc_avx512 = yes; then
 fi
 LIBC_CONFIG_VAR([config-cflags-avx512], [$libc_cv_cc_avx512])
 
-dnl Check if -mno-vzeroupper works.
-AC_CACHE_CHECK(for -mno-vzeroupper support, libc_cv_cc_novzeroupper, [dnl
-LIBC_TRY_CC_OPTION([-mno-vzeroupper],
-		   [libc_cv_cc_novzeroupper=yes],
-		   [libc_cv_cc_novzeroupper=no])
-])
-LIBC_CONFIG_VAR([config-cflags-novzeroupper], [$libc_cv_cc_novzeroupper])
-
 dnl Check whether asm supports Intel MPX
 AC_CACHE_CHECK(for Intel MPX support, libc_cv_asm_mpx, [dnl
 cat > conftest.s <<\EOF

-- 
Joseph S. Myers
joseph@codesourcery.com

Follow-Ups:
- Re: Remove configure tests for -mno-vzeroupper support
  - From: H.J. Lu

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