From 9472f35a0a6dbbda82ce103aaf0f5013f5d46e34 Mon Sep 17 00:00:00 2001
From: Stefan Liebler <stli@linux.vnet.ibm.com>
Date: Wed, 26 Aug 2015 10:26:20 +0200
Subject: S390: Optimize strlen and wcslen.

This patch provides optimized versions of strlen and wcslen with the z13 vector
instructions.
The helper macro IFUNC_VX_IMPL is introduced and is used to register all
__<func>_c() and __<func>_vx() functions within __libc_ifunc_impl_list()
to the ifunc test framework.

ChangeLog:

	* sysdeps/s390/multiarch/Makefile: New File.
	* sysdeps/s390/multiarch/strlen-c.c: Likewise.
	* sysdeps/s390/multiarch/strlen-vx.S: Likewise.
	* sysdeps/s390/multiarch/strlen.c: Likewise.
	* sysdeps/s390/multiarch/wcslen-c.c: Likewise.
	* sysdeps/s390/multiarch/wcslen-vx.S: Likewise.
	* sysdeps/s390/multiarch/wcslen.c: Likewise.
	* string/strlen.c (STRLEN): Define and use macro.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(IFUNC_VX_IMPL): New macro function.
	(__libc_ifunc_impl_list): Add ifunc test for strlen, wcslen.
	* benchtests/Makefile (wcsmbs-bench): New variable.
	(string-bench-all): Added wcsmbs-bench.
	* benchtests/bench-wcslen.c: New File.
---
 sysdeps/s390/multiarch/ifunc-impl-list.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'sysdeps/s390/multiarch/ifunc-impl-list.c')

diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
index c33090412f..e9639ef02f 100644
--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
@@ -18,6 +18,7 @@
 
 #include <assert.h>
 #include <string.h>
+#include <wchar.h>
 #include <ifunc-impl-list.h>
 #include <ifunc-resolve.h>
 
@@ -70,5 +71,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 
 #endif /* SHARED */
 
+#ifdef HAVE_S390_VX_ASM_SUPPORT
+
+# define IFUNC_VX_IMPL(FUNC)						\
+  IFUNC_IMPL (i, name, FUNC,						\
+	      IFUNC_IMPL_ADD (array, i, FUNC, dl_hwcap & HWCAP_S390_VX, \
+			      __##FUNC##_vx)				\
+	      IFUNC_IMPL_ADD (array, i, FUNC, 1, __##FUNC##_c))
+
+  IFUNC_VX_IMPL (strlen);
+  IFUNC_VX_IMPL (wcslen);
+
+#endif /* HAVE_S390_VX_ASM_SUPPORT */
+
   return i;
 }
-- 
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