Add i386 memcmp multiarch functions

8 files changed, 115 insertions, 3 deletions

diff --git a/sysdeps/i386/multiarch/Makefile b/sysdeps/i386/multiarch/Makefile
index c9508a26a5..375f66ccc4 100644
--- a/sysdeps/i386/multiarch/Makefile
+++ b/sysdeps/i386/multiarch/Makefile
@@ -18,5 +18,6 @@ sysdep_routines += bcopy-i386 bcopy-i686 bcopy-sse2-unaligned \
 		   bzero-sse2 bzero-sse2-rep \
 		   memset-i386 memset-i586 memset-i686 \
 		   memset-sse2 memset-sse2-rep \
-		   memchr-sse2-bsf memchr-sse2
+		   memchr-sse2-bsf memchr-sse2 \
+		   memcmp-i386 memcmp-i686 memcmp-ssse3 memcmp-sse4
 endif
diff --git a/sysdeps/i386/multiarch/ifunc-impl-list.c b/sysdeps/i386/multiarch/ifunc-impl-list.c
index 680e46797b..1c9ae6a9cc 100644
--- a/sysdeps/i386/multiarch/ifunc-impl-list.c
+++ b/sysdeps/i386/multiarch/ifunc-impl-list.c
@@ -73,15 +73,17 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 			      __memchr_sse2)
 	      IFUNC_IMPL_ADD (array, i, memchr, 1, __memchr_i386))
 
-#if 0
   /* Support sysdeps/i386/i686/multiarch/memcmp.S.  */
   IFUNC_IMPL (i, name, memcmp,
 	      IFUNC_IMPL_ADD (array, i, memcmp, HAS_CPU_FEATURE (SSE4_2),
 			      __memcmp_sse4_2)
 	      IFUNC_IMPL_ADD (array, i, memcmp, HAS_CPU_FEATURE (SSSE3),
 			      __memcmp_ssse3)
-	      IFUNC_IMPL_ADD (array, i, memcmp, 1, __memcmp_ia32))
+	      IFUNC_IMPL_ADD (array, i, memcmp, HAS_I686, __memcmp_i686)
+#if !SUPPORT_I686
+	      IFUNC_IMPL_ADD (array, i, memcmp, 1, __memcmp_i386)
 #endif
+	      )
 
   /* Support sysdeps/i386/i686/multiarch/memmove_chk.S.  */
   IFUNC_IMPL (i, name, __memmove_chk,
diff --git a/sysdeps/i386/multiarch/memcmp-i386.S b/sysdeps/i386/multiarch/memcmp-i386.S
new file mode 100644
index 0000000000..bdc1b1da5b
--- /dev/null
+++ b/sysdeps/i386/multiarch/memcmp-i386.S
@@ -0,0 +1,15 @@
+#include <init-arch.h>
+#if !SUPPORT_I686
+# define memcmp __memcmp_i386
+# undef libc_hidden_builtin_def
+# define libc_hidden_builtin_def(name)
+# undef weak_alias
+# define weak_alias(name, aliasname)
+# include <sysdeps/i386/memcmp.S>
+
+# ifdef SHARED
+	.globl __GI_memcmp
+	.hidden __GI_memcmp
+	__GI_memcmp = __memcmp_i386
+# endif
+#endif
diff --git a/sysdeps/i386/multiarch/memcmp-i686.S b/sysdeps/i386/multiarch/memcmp-i686.S
new file mode 100644
index 0000000000..18c682a189
--- /dev/null
+++ b/sysdeps/i386/multiarch/memcmp-i686.S
@@ -0,0 +1,13 @@
+#include <init-arch.h>
+#define memcmp __memcmp_i686
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+#undef weak_alias
+#define weak_alias(name, aliasname)
+# include <sysdeps/i386/i686/memcmp.S>
+
+#if defined SHARED && SUPPORT_I686
+	.globl __GI_memcmp
+	.hidden __GI_memcmp
+	__GI_memcmp = __memcmp_i686
+#endif
diff --git a/sysdeps/i386/i686/multiarch/memcmp-sse4.S b/sysdeps/i386/multiarch/memcmp-sse4.S
index b3756f4a00..b3756f4a00 100644
--- a/sysdeps/i386/i686/multiarch/memcmp-sse4.S
+++ b/sysdeps/i386/multiarch/memcmp-sse4.S
diff --git a/sysdeps/i386/i686/multiarch/memcmp-ssse3.S b/sysdeps/i386/multiarch/memcmp-ssse3.S
index ea2a25b216..ea2a25b216 100644
--- a/sysdeps/i386/i686/multiarch/memcmp-ssse3.S
+++ b/sysdeps/i386/multiarch/memcmp-ssse3.S
diff --git a/sysdeps/i386/multiarch/memcmp.c b/sysdeps/i386/multiarch/memcmp.c
new file mode 100644
index 0000000000..a0cd039fce
--- /dev/null
+++ b/sysdeps/i386/multiarch/memcmp.c
@@ -0,0 +1,57 @@
+/* Multiple versions of memcmp.
+   All versions must be listed in ifunc-impl-list.c.
+   Copyright (C) 2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Define multiple versions only for the definition in lib.  */
+#if IS_IN (libc)
+/* Redefine memcmp so that the compiler won't complain about the type
+   mismatch with the IFUNC selector in strong_alias, below.  */
+# undef memcmp
+# define memcmp __redirect_memcmp
+# include <string.h>
+# undef memcmp
+
+# include <init-arch.h>
+
+extern __typeof (__redirect_memcmp) __memcmp_i386 attribute_hidden;
+extern __typeof (__redirect_memcmp) __memcmp_i686 attribute_hidden;
+extern __typeof (__redirect_memcmp) __memcmp_ssse3 attribute_hidden;
+extern __typeof (__redirect_memcmp) __memcmp_sse4_2 attribute_hidden;
+
+/* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
+   ifunc symbol properly.  */
+extern __typeof (__redirect_memcmp) memcmp;
+extern void *memcmp_ifunc (void) __asm__ ("memcmp");
+
+void *
+memcmp_ifunc (void)
+{
+  if (HAS_CPU_FEATURE (SSE4_2))
+    return __memcmp_sse4_2;
+  else if (HAS_CPU_FEATURE (SSSE3))
+    return __memcmp_ssse3;
+
+  if (HAS_I686)
+    return __memcmp_i686;
+  else
+    return __memcmp_i386;
+}
+__asm__ (".type memcmp, %gnu_indirect_function");
+
+weak_alias (memcmp, bcmp)
+#endif
diff --git a/sysdeps/i386/multiarch/rtld-memcmp.S b/sysdeps/i386/multiarch/rtld-memcmp.S
new file mode 100644
index 0000000000..89466a5e62
--- /dev/null
+++ b/sysdeps/i386/multiarch/rtld-memcmp.S
@@ -0,0 +1,24 @@
+/* memcmp for ld.so
+   Copyright (C) 2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <init-arch.h>
+#if SUPPORT_I686
+# include <sysdeps/i386/i686/memcmp.S>
+#else
+# include <sysdeps/i386/memcmp.S>
+#endif