Remove -mavx2 configure tests.

There are configure tests for the -mavx2 compiler option.  AVX2
support was added in GCC 4.7, so these tests are now obsolete; this
patch removes them.

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

	* sysdeps/i386/configure.ac (libc_cv_cc_avx2): Remove configure
	test.
	* sysdeps/i386/configure: Regenerated.
	* sysdeps/x86_64/configure.ac (libc_cv_cc_avx2): Remove configure
	test.
	* sysdeps/x86_64/configure: Regenerated.
	* config.h.in (HAVE_AVX2_SUPPORT): Remove #undef.
	* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
	memset-avx2 unconditionally instead of conditionally on
	[$(config-cflags-avx2) = yes].
	* sysdeps/x86_64/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list) [HAVE_AVX2_SUPPORT]: Make code
	unconditional.
	* sysdeps/x86_64/multiarch/memset.S [HAVE_AVX2_SUPPORT]: Likewise.
	* sysdeps/x86_64/multiarch/memset_chk.S
	[IS_IN (libc) && SHARED && HAVE_AVX2_SUPPORT]: Change conditional
	to [IS_IN (libc) && SHARED].

4 files changed, 15 insertions, 23 deletions

diff --git a/sysdeps/x86_64/multiarch/Makefile b/sysdeps/x86_64/multiarch/Makefile
index 396b0b3105..bb811c2dfb 100644
--- a/sysdeps/x86_64/multiarch/Makefile
+++ b/sysdeps/x86_64/multiarch/Makefile
@@ -18,15 +18,11 @@ sysdep_routines += strncat-c stpncpy-c strncpy-c strcmp-ssse3 \
 		   stpcpy-sse2-unaligned stpncpy-sse2-unaligned \
 		   strcat-sse2-unaligned strncat-sse2-unaligned \
 		   strchr-sse2-no-bsf memcmp-ssse3 strstr-sse2-unaligned \
-		   strcspn-c strpbrk-c strspn-c varshift
+		   strcspn-c strpbrk-c strspn-c varshift memset-avx2
 CFLAGS-varshift.c += -msse4
 CFLAGS-strcspn-c.c += -msse4
 CFLAGS-strpbrk-c.c += -msse4
 CFLAGS-strspn-c.c += -msse4
-
-ifeq (yes,$(config-cflags-avx2))
-sysdep_routines += memset-avx2
-endif
 endif
 
 ifeq ($(subdir),wcsmbs)
diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
index e5c517eabc..5c0c219306 100644
--- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
@@ -70,7 +70,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 			      __memmove_ssse3)
 	      IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_sse2))
 
-#ifdef HAVE_AVX2_SUPPORT
   /* Support sysdeps/x86_64/multiarch/memset_chk.S.  */
   IFUNC_IMPL (i, name, __memset_chk,
 	      IFUNC_IMPL_ADD (array, i, __memset_chk, 1,
@@ -85,7 +84,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, memset,
 			      HAS_ARCH_FEATURE (AVX2_Usable),
 			      __memset_avx2))
-#endif
 
   /* Support sysdeps/x86_64/multiarch/stpncpy.S.  */
   IFUNC_IMPL (i, name, stpncpy,
diff --git a/sysdeps/x86_64/multiarch/memset.S b/sysdeps/x86_64/multiarch/memset.S
index 16fefa7073..dbc00d25e3 100644
--- a/sysdeps/x86_64/multiarch/memset.S
+++ b/sysdeps/x86_64/multiarch/memset.S
@@ -17,13 +17,12 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#ifdef HAVE_AVX2_SUPPORT
 #include <sysdep.h>
 #include <shlib-compat.h>
 #include <init-arch.h>
 
 /* Define multiple versions only for the definition in lib.  */
-# if IS_IN (libc)
+#if IS_IN (libc)
 ENTRY(memset)
 	.type	memset, @gnu_indirect_function
 	LOAD_RTLD_GLOBAL_RO_RDX
@@ -33,27 +32,26 @@ ENTRY(memset)
 	leaq	__memset_avx2(%rip), %rax
 2:	ret
 END(memset)
-# endif
+#endif
 
-# if IS_IN (libc)
-#  undef memset
-#  define memset __memset_sse2
+#if IS_IN (libc)
+# undef memset
+# define memset __memset_sse2
 
-#  undef __memset_chk
-#  define __memset_chk __memset_chk_sse2
+# undef __memset_chk
+# define __memset_chk __memset_chk_sse2
 
-#  ifdef SHARED
-#  undef libc_hidden_builtin_def
+# ifdef SHARED
+# undef libc_hidden_builtin_def
 /* It doesn't make sense to send libc-internal memset calls through a PLT.
    The speedup we get from using GPR instruction is likely eaten away
    by the indirect call in the PLT.  */
-#  define libc_hidden_builtin_def(name) \
+# define libc_hidden_builtin_def(name) \
 	.globl __GI_memset; __GI_memset = __memset_sse2
-#  endif
-
-#  undef strong_alias
-#  define strong_alias(original, alias)
 # endif
+
+# undef strong_alias
+# define strong_alias(original, alias)
 #endif
 
 #include "../memset.S"
diff --git a/sysdeps/x86_64/multiarch/memset_chk.S b/sysdeps/x86_64/multiarch/memset_chk.S
index ef8c64f168..e2abb150d0 100644
--- a/sysdeps/x86_64/multiarch/memset_chk.S
+++ b/sysdeps/x86_64/multiarch/memset_chk.S
@@ -22,7 +22,7 @@
 
 /* Define multiple versions only for the definition in lib.  */
 #if IS_IN (libc)
-# if defined SHARED && defined HAVE_AVX2_SUPPORT
+# ifdef SHARED
 ENTRY(__memset_chk)
 	.type	__memset_chk, @gnu_indirect_function
 	LOAD_RTLD_GLOBAL_RO_RDX