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[PATCH 11/19] PowerPC: multiarch strncmp for PowerPC32

From: Adhemerval Zanella <azanella at linux dot vnet dot ibm dot com>
To: "GNU C. Library" <libc-alpha at sourceware dot org>
Date: Thu, 31 Oct 2013 10:11:59 -0200
Subject: [PATCH 11/19] PowerPC: multiarch strncmp for PowerPC32
Authentication-results: sourceware.org; auth=none
References: <52724052 dot 3070609 at linux dot vnet dot ibm dot com>

2013-08-19  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>

	* sysdeps/powerpc/powerpc32/power4/multiarch/strncmp-power7.S: New
	file.
	* sysdeps/powerpc/powerpc32/power4/multiarch/strncmp-ppc32.S: New
	file.
	* sysdeps/powerpc/powerpc32/power4/multiarch/strncmp.c: New file:
	multiarch strncmp for PPC32.
	* sysdeps/powerpc/powerpc32/power4/multiarch/Makefile: Added strncmp
	multiarch objects.
	* sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list
	(__libc_ifunc_impl_list): Likewise.

--

diff --git a/sysdeps/powerpc/powerpc32/power4/multiarch/Makefile b/sysdeps/powerpc/powerpc32/power4/multiarch/Makefile
index b84f867..d82f691 100644
--- a/sysdeps/powerpc/powerpc32/power4/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc32/power4/multiarch/Makefile
@@ -5,5 +5,5 @@ sysdep_routines += memcpy-power7 memcpy-a2 memcpy-power6 memcpy-cell \
 		   bzero-ppc32 mempcpy-power7 mempcpy-ppc32 memchr-power7 \
 		   memchr-ppc32 memrchr-power7 memrchr-ppc32 rawmemchr-power7 \
 		   rawmemchr-ppc32 strlen-power7 strlen-ppc32 strnlen-power7 \
-		   strnlen-ppc32
+		   strnlen-ppc32 strncmp-power7 strncmp-ppc32
 endif
diff --git a/sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list.c
index b2c6691..a964881 100644
--- a/sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list.c
+++ b/sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list.c
@@ -88,6 +88,13 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 			      __strnlen_power7)
 	      IFUNC_IMPL_ADD (array, i, strnlen, 1,
 			      __strnlen_ppc))
+
+  /* Support sysdeps/powerpc/powerpc32/multiarch/strncmp.c.  */
+  IFUNC_IMPL (i, name, strncmp,
+	      IFUNC_IMPL_ADD (array, i, strncmp, hwcap & PPC_FEATURE_HAS_VSX,
+			      __strncmp_power7)
+	      IFUNC_IMPL_ADD (array, i, strncmp, 1,
+			      __strncmp_ppc))
 #endif
 
   /* Support sysdeps/powerpc/powerpc32/power4/multiarch/memcmp.c.  */
diff --git a/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp-power7.S b/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp-power7.S
new file mode 100644
index 0000000..c9240e5
--- /dev/null
+++ b/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp-power7.S
@@ -0,0 +1,38 @@
+/* Optimized strcmp implementation for POWER7/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>
+
+#undef EALIGN
+#define EALIGN(name, alignt, words)				\
+ .globl C_SYMBOL_NAME(__strncmp_power7);			\
+ .type C_SYMBOL_NAME(__strncmp_power7),@function;		\
+ .align ALIGNARG(alignt);					\
+ EALIGN_W_##words;						\
+ C_LABEL(__strncmp_power7)					\
+ cfi_startproc;
+
+#undef END
+#define END(name)						\
+ cfi_endproc;							\
+ ASM_SIZE_DIRECTIVE(__strncmp_power7)
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
+#include <sysdeps/powerpc/powerpc32/power7/strncmp.S>
diff --git a/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp-ppc32.S b/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp-ppc32.S
new file mode 100644
index 0000000..bd573bb
--- /dev/null
+++ b/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp-ppc32.S
@@ -0,0 +1,40 @@
+/* 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>
+
+#if defined SHARED && !defined NOT_IN_libc
+# undef EALIGN
+# define EALIGN(name, alignt, words)				\
+  .globl C_SYMBOL_NAME(__strncmp_ppc);			\
+  .type C_SYMBOL_NAME(__strncmp_ppc),@function;		\
+  .align ALIGNARG(alignt);					\
+  EALIGN_W_##words;						\
+  C_LABEL(__strncmp_ppc)					\
+  cfi_startproc;
+
+# undef END
+# define END(name)						\
+  cfi_endproc;							\
+  ASM_SIZE_DIRECTIVE(__strncmp_ppc)
+
+# undef libc_hidden_builtin_def
+# define libc_hidden_builtin_def(name)				\
+    .globl __GI_strncmp; __GI_strncmp = __strncmp_ppc
+#endif
+
+#include <sysdeps/powerpc/powerpc32/power4/strncmp.S>
diff --git a/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp.c b/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp.c
new file mode 100644
index 0000000..5dea076
--- /dev/null
+++ b/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp.c
@@ -0,0 +1,35 @@
+/* Multiple versions of strncmp.
+   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/>.  */
+
+/* Define multiple versions only for definition in libc.  */
+#if defined SHARED && !defined NOT_IN_libc
+# include <string.h>
+# include <shlib-compat.h>
+# include "init-arch.h"
+
+extern __typeof (strncmp) __strncmp_ppc attribute_hidden;
+extern __typeof (strncmp) __strncmp_power4 attribute_hidden;
+extern __typeof (strncmp) __strncmp_power7 attribute_hidden;
+
+/* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
+   ifunc symbol properly.  */
+libc_ifunc (strncmp,
+            (hwcap & PPC_FEATURE_HAS_VSX)
+            ? __strncmp_power7
+            : __strncmp_ppc);
+#endif

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