PowerPC: Add 32-bit multilib implementation of strncmp

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

6 files changed, 118 insertions, 7 deletions

diff --git a/ChangeLog b/ChangeLog
index 7969bc294f..d441895323 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,16 @@
 2013-03-07  Tulio Magno Quites Machado Filho  <tuliom@linux.vnet.ibm.com>
 
+	* sysdeps/powerpc/powerpc32/multiarch/Makefile (sysdep_routines):
+	Add strncmp implementations.
+	* sysdeps/powerpc/powerpc32/multiarch/ifunc-impl-list.c: Add strncmp.
+	* sysdeps/powerpc/powerpc32/multiarch/strncmp.S: New file
+	* sysdeps/powerpc/powerpc32/power4/strncmp.S: Moved to...
+	* sysdeps/powerpc/powerpc32/multiarch/strncmp-power4.S: ... here.
+	* sysdeps/powerpc/powerpc32/power7/strncmp.S: Moved to...
+	* sysdeps/powerpc/powerpc32/multiarch/strncmp-power7.S: ... here.
+
+2013-03-07  Tulio Magno Quites Machado Filho  <tuliom@linux.vnet.ibm.com>
+
 	* sysdeps/powerpc/powerpc32/bzero.S: Port to multilib.
 	* sysdeps/powerpc/powerpc32/multiarch/Makefile (sysdep_routines):
 	Add memset and bzero implementations.
diff --git a/sysdeps/powerpc/powerpc32/multiarch/Makefile b/sysdeps/powerpc/powerpc32/multiarch/Makefile
index 28d74f172e..42c39b215e 100644
--- a/sysdeps/powerpc/powerpc32/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc32/multiarch/Makefile
@@ -1,5 +1,6 @@
 ifeq ($(subdir),string)
 sysdep_routines += memcpy-power7 memcpy-a2 memcpy-power6 memcpy-cell \
 		   memcmp-power7 memset-power4 memset-power6 memset-power7 \
-		   bzero-power4 bzero-power6 bzero-power7
+		   bzero-power4 bzero-power6 bzero-power7 \
+		   strncmp-power7 strncmp-power4
 endif
diff --git a/sysdeps/powerpc/powerpc32/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc32/multiarch/ifunc-impl-list.c
index 42b372a4e2..e5c6354663 100644
--- a/sysdeps/powerpc/powerpc32/multiarch/ifunc-impl-list.c
+++ b/sysdeps/powerpc/powerpc32/multiarch/ifunc-impl-list.c
@@ -77,6 +77,13 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 			      hwcap & (PPC_FEATURE_CELL_BE >> 16),
 			      __memcpy_cell)
 	      IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_ppc32))
+
+  IFUNC_IMPL (i, name, strncmp,
+	      IFUNC_IMPL_ADD (array, i, strncmp, hwcap & PPC_FEATURE_HAS_VSX,
+			      __strncmp_power7)
+	      IFUNC_IMPL_ADD (array, i, strncmp, hwcap & PPC_POWER4,
+			      __strncmp_power4)
+	      IFUNC_IMPL_ADD (array, i, strncmp, 1, __strncmp_ppc32))
 #endif
 
   return i;
diff --git a/sysdeps/powerpc/powerpc32/power4/strncmp.S b/sysdeps/powerpc/powerpc32/multiarch/strncmp-power4.S
index 724d9084a9..ffbd11e0b4 100644
--- a/sysdeps/powerpc/powerpc32/power4/strncmp.S
+++ b/sysdeps/powerpc/powerpc32/multiarch/strncmp-power4.S
@@ -22,7 +22,8 @@
 
 /* int [r3] strncmp (const char *s1 [r3], const char *s2 [r4], size_t size [r5])  */
 
-EALIGN (strncmp, 4, 0)
+	.machine power4
+EALIGN (__strncmp_power4, 4, 0)
 
 #define rTMP	r0
 #define rRTN	r3
@@ -166,5 +167,4 @@ L(u4):	sub	rRTN, rWORD1, rWORD2
 L(ux):
 	li	rRTN, 0
 	blr
-END (strncmp)
-libc_hidden_builtin_def (strncmp)
+END (__strncmp_power4)
diff --git a/sysdeps/powerpc/powerpc32/power7/strncmp.S b/sysdeps/powerpc/powerpc32/multiarch/strncmp-power7.S
index fdae44d265..c2cb8cdf8f 100644
--- a/sysdeps/powerpc/powerpc32/power7/strncmp.S
+++ b/sysdeps/powerpc/powerpc32/multiarch/strncmp-power7.S
@@ -24,7 +24,8 @@
 		     const char *s2 [r4],
 		     size_t size [r5])  */
 
-EALIGN (strncmp,5,0)
+	.machine power7
+EALIGN (__strncmp_power7,5,0)
 
 #define rTMP	r0
 #define rRTN	r3
@@ -170,5 +171,4 @@ L(u4):	sub	rRTN,rWORD1,rWORD2
 L(ux):
 	li	rRTN,0
 	blr
-END (strncmp)
-libc_hidden_builtin_def (strncmp)
+END (__strncmp_power7)
diff --git a/sysdeps/powerpc/powerpc32/multiarch/strncmp.S b/sysdeps/powerpc/powerpc32/multiarch/strncmp.S
new file mode 100644
index 0000000000..5e7e5b7dbc
--- /dev/null
+++ b/sysdeps/powerpc/powerpc32/multiarch/strncmp.S
@@ -0,0 +1,92 @@
+/* Optimized strncmp 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(strncmp)
+	.type   strncmp, @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)
+	andis.	r7,r6,(PPC_FEATURE_POWER4>>16)
+	bne-	L(power4)
+# ifdef PIC
+	lwz	r3,__strncmp_ppc32@got(r5)
+# else
+	lis	r3,__strncmp_ppc32@ha
+	lwz	r3,__strncmp_ppc32@l(r3)
+# endif
+	blr
+L(power7):
+# ifdef PIC
+	lwz	r3,__strncmp_power7@got(r5)
+# else
+	lis	r3,__strncmp_power7@ha
+	lwz	r3,__strncmp_power7@l(r3)
+# endif
+	blr
+L(power4):
+# ifdef PIC
+	lwz	r3,__strncmp_power4@got(r5)
+# else
+	lis	r3,__strncmp_power4@ha
+	lwz	r3,__strncmp_power4@l(r3)
+# endif
+	blr
+END(strncmp)
+
+# undef EALIGN
+# define EALIGN(name, alignt, words)                           \
+  .globl C_SYMBOL_NAME(__strncmp_ppc32);                        \
+  .type C_SYMBOL_NAME(__strncmp_ppc32),@function ;              \
+  .align ALIGNARG(alignt);                                     \
+  EALIGN_W_##words;                                            \
+  C_LABEL(__strncmp_ppc32)                                      \
+  cfi_startproc;
+
+# undef END
+# define END(name)                                             \
+  cfi_endproc;                                                 \
+  ASM_SIZE_DIRECTIVE(__strncmp_ppc32)
+
+# undef libc_hidden_builtin_def
+# define libc_hidden_builtin_def(name)                         \
+  .globl __GI_strncmp; __GI_strncmp = __strncmp_ppc32
+
+#endif
+
+#include "../strncmp.S"