PowerPC: Add 32-bit multilib implementation of memcmp

Move and rename specialized memcmp implementation to multilib folder and
add IFUNC memcmp source.

5 files changed, 91 insertions, 5 deletions

diff --git a/sysdeps/powerpc/powerpc32/power4/memcmp.S b/sysdeps/powerpc/powerpc32/memcmp.S
index edec7ab274..f2850b025c 100644
--- a/sysdeps/powerpc/powerpc32/power4/memcmp.S
+++ b/sysdeps/powerpc/powerpc32/memcmp.S
@@ -20,7 +20,6 @@
 
 /* int [r3] memcmp (const char *s1 [r3], const char *s2 [r4], size_t size [r5])  */
 
-	.machine power4
 EALIGN (memcmp, 4, 0)
 	CALL_MCOUNT
 
diff --git a/sysdeps/powerpc/powerpc32/multiarch/Makefile b/sysdeps/powerpc/powerpc32/multiarch/Makefile
index 9c2789015a..fb0e53a393 100644
--- a/sysdeps/powerpc/powerpc32/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc32/multiarch/Makefile
@@ -1,3 +1,4 @@
 ifeq ($(subdir),string)
-sysdep_routines += memcpy-power7 memcpy-a2 memcpy-power6 memcpy-cell
+sysdep_routines += memcpy-power7 memcpy-a2 memcpy-power6 memcpy-cell \
+		   memcmp-power7
 endif
diff --git a/sysdeps/powerpc/powerpc32/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc32/multiarch/ifunc-impl-list.c
index 2a23669f16..ca371beecd 100644
--- a/sysdeps/powerpc/powerpc32/multiarch/ifunc-impl-list.c
+++ b/sysdeps/powerpc/powerpc32/multiarch/ifunc-impl-list.c
@@ -38,6 +38,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
   hwcap = GLRO(dl_hwcap);
 
 #ifdef SHARED
+  IFUNC_IMPL (i, name, memcmp,
+	      IFUNC_IMPL_ADD (array, i, memcmp, hwcap & PPC_FEATURE_HAS_VSX,
+			      __memcmp_power7)
+	      IFUNC_IMPL_ADD (array, i, memcmp, 1, __memcmp_ppc32))
+
   IFUNC_IMPL (i, name, memcpy,
 	      IFUNC_IMPL_ADD (array, i, memcpy, hwcap & PPC_FEATURE_HAS_VSX,
 			      __memcpy_power7)
diff --git a/sysdeps/powerpc/powerpc32/power7/memcmp.S b/sysdeps/powerpc/powerpc32/multiarch/memcmp-power7.S
index f764b7ce31..6f2c7f1e3f 100644
--- a/sysdeps/powerpc/powerpc32/power7/memcmp.S
+++ b/sysdeps/powerpc/powerpc32/multiarch/memcmp-power7.S
@@ -23,7 +23,7 @@
 		    size_t size [r5])  */
 
 	.machine power7
-EALIGN (memcmp,4,0)
+EALIGN (__memcmp_power7,4,0)
 	CALL_MCOUNT
 
 #define rTMP	r0
@@ -980,6 +980,5 @@ L(dureturn25):
 	lwz	r24,20(r1)
 	lwz	1,0(1)
 	blr
-END (memcmp)
-libc_hidden_builtin_def (memcmp)
+END (__memcmp_power7)
 weak_alias (memcmp,bcmp)
diff --git a/sysdeps/powerpc/powerpc32/multiarch/memcmp.S b/sysdeps/powerpc/powerpc32/multiarch/memcmp.S
new file mode 100644
index 0000000000..09f8eb7242
--- /dev/null
+++ b/sysdeps/powerpc/powerpc32/multiarch/memcmp.S
@@ -0,0 +1,82 @@
+/* Optimized memcmp implementation for PowerPC32.
+   Copyright (C) 2013 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 <sysdep.h>
+#include <rtld-global-offsets.h>
+
+/* Define multiple versions only for the definition in libc.  */
+#if defined SHARED && !defined NOT_IN_libc
+	.text
+ENTRY(memcmp)
+	.type   memcmp, @gnu_indirect_function
+# ifdef PIC
+	mflr	r11
+	cfi_register (lr,r11)
+	bcl 	20,31,1f
+1:	mflr	r5
+	addis	r5,r5,_GLOBAL_OFFSET_TABLE_-1b@ha
+	addi	r5,r5,_GLOBAL_OFFSET_TABLE_-1b@l
+	lwz	r6,_rtld_global_ro@got(r5)
+	mtlr	r11
+	cfi_same_value (lr)
+	lwz	r6,RTLD_GLOBAL_RO_DL_HWCAP_OFFSET+4(r6)
+# else
+	lis	r6,(_dl_hwcap+4)@ha
+	lwz	r6,(_dl_hwcap+4)@l(r6)
+# endif
+	/* r5 - got pointer | r6 - _dl_hwcap */
+	andi.	r7,r6,PPC_FEATURE_HAS_VSX
+	bne-	L(power7)
+# ifdef PIC
+	lwz	r3,__memcmp_ppc32@got(r5)
+# else
+	lis	r3,__memcmp_ppc32@ha
+	lwz	r3,__memcmp_ppc32@l(r3)
+# endif
+	blr
+L(power7):
+# ifdef PIC
+	lwz	r3,__memcmp_power7@got(r5)
+# else
+	lis	r3,__memcmp_power7@ha
+	lwz	r3,__memcmp_power7@l(r3)
+# endif
+	blr
+END(memcmp)
+
+# undef EALIGN
+# define EALIGN(name, alignt, words)                           \
+  .globl C_SYMBOL_NAME(__memcmp_ppc32);                        \
+  .type C_SYMBOL_NAME(__memcmp_ppc32),@function ;              \
+  .align ALIGNARG(alignt);                                     \
+  EALIGN_W_##words;                                            \
+  C_LABEL(__memcmp_ppc32)                                      \
+  cfi_startproc;
+
+# undef END
+# define END(name)                                             \
+  cfi_endproc;                                                 \
+  ASM_SIZE_DIRECTIVE(__memcmp_ppc32)
+
+# undef libc_hidden_builtin_def
+# define libc_hidden_builtin_def(name)                         \
+  .globl __GI_memcmp; __GI_memcmp = __memcmp_ppc32
+
+#endif
+
+#include "../memcmp.S"