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authorH.J. Lu <hjl.tools@gmail.com>2014-07-14 07:58:27 -0700
committerH.J. Lu <hjl.tools@gmail.com>2014-07-14 07:58:27 -0700
commitf2fef657d8736c32fb600771949f59852558b11a (patch)
treea9e954223fa5cbd9e53f143e0f50c6f6276ebe0c /sysdeps/i386
parentf6c44d475104e931bab2b4ffa499961088de673c (diff)
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Enable AVX2 optimized memset only if -mavx2 works
	* config.h.in (HAVE_AVX2_SUPPORT): New #undef.
	* sysdeps/i386/configure.ac: Set HAVE_AVX2_SUPPORT and
	config-cflags-avx2.
	* sysdeps/x86_64/configure.ac: Likewise.
	* sysdeps/i386/configure: Regenerated.
	* sysdeps/x86_64/configure: Likewise.
	* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
	memset-avx2 only if config-cflags-avx2 is yes.
	* sysdeps/x86_64/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list):
	Tests for memset_chk and memset only if HAVE_AVX2_SUPPORT is
	defined.
	* sysdeps/x86_64/multiarch/memset.S: Define multiple versions
	only if HAVE_AVX2_SUPPORT is defined.
	* sysdeps/x86_64/multiarch/memset_chk.S: Likewise.
Diffstat (limited to 'sysdeps/i386')
-rw-r--r--sysdeps/i386/configure26
-rw-r--r--sysdeps/i386/configure.ac9
2 files changed, 35 insertions, 0 deletions
diff --git a/sysdeps/i386/configure b/sysdeps/i386/configure
index f0a20e3d3b..6e89b597e3 100644
--- a/sysdeps/i386/configure
+++ b/sysdeps/i386/configure
@@ -240,6 +240,32 @@ $as_echo "$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 AVX2 support" >&5
+$as_echo_n "checking for AVX2 support... " >&6; }
+if ${libc_cv_cc_avx2+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if { ac_try='${CC-cc} -mavx2 -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_avx2=yes
+else
+  libc_cv_cc_avx2=no
+fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_avx2" >&5
+$as_echo "$libc_cv_cc_avx2" >&6; }
+if test $libc_cv_cc_avx2 = yes; then
+  $as_echo "#define HAVE_AVX2_SUPPORT 1" >>confdefs.h
+
+fi
+config_vars="$config_vars
+config-cflags-avx2 = $libc_cv_cc_avx2"
+
 $as_echo "#define USE_REGPARMS 1" >>confdefs.h
 
 
diff --git a/sysdeps/i386/configure.ac b/sysdeps/i386/configure.ac
index dfe0b47343..35c45227ff 100644
--- a/sysdeps/i386/configure.ac
+++ b/sysdeps/i386/configure.ac
@@ -88,6 +88,15 @@ LIBC_TRY_CC_OPTION([-mno-vzeroupper],
 ])
 LIBC_CONFIG_VAR([config-cflags-novzeroupper], [$libc_cv_cc_novzeroupper])
 
+dnl Check if -mavx2 works.
+AC_CACHE_CHECK(for AVX2 support, libc_cv_cc_avx2, [dnl
+LIBC_TRY_CC_OPTION([-mavx2], [libc_cv_cc_avx2=yes], [libc_cv_cc_avx2=no])
+])
+if test $libc_cv_cc_avx2 = yes; then
+  AC_DEFINE(HAVE_AVX2_SUPPORT)
+fi
+LIBC_CONFIG_VAR([config-cflags-avx2], [$libc_cv_cc_avx2])
+
 AC_DEFINE(USE_REGPARMS)
 
 dnl It is always possible to access static and hidden symbols in an