From 74fa8494fa732a0bd63b14b60ea0f1e542e0cee6 Mon Sep 17 00:00:00 2001

From: Stefan Liebler <stli@linux.vnet.ibm.com>

Date: Thu, 8 Oct 2015 11:09:04 +0200

Subject: [PATCH 14/30] S390: Optimize strncpy and wcsncpy.

upstream-commit-id: d183b96ee6dc694e95f212c9272a178163351b19

https://www.sourceware.org/ml/libc-alpha/2015-07/msg00160.html

This patch provides optimized versions of strncpy and wcsncpy with the z13

vector instructions.

ChangeLog:

	* sysdeps/s390/multiarch/strncpy-vx.S: New File.

	* sysdeps/s390/multiarch/strncpy.c: Likewise.

	* sysdeps/s390/multiarch/wcsncpy-c.c: Likewise.

	* sysdeps/s390/multiarch/wcsncpy-vx.S: Likewise.

	* sysdeps/s390/multiarch/wcsncpy.c: Likewise.

	* sysdeps/s390/s390-32/multiarch/strncpy.c: Likewise.

	* sysdeps/s390/s390-64/multiarch/strncpy.c: Likewise.

	* sysdeps/s390/multiarch/Makefile (sysdep_routines): Add strncpy and

	wcsncpy functions.

	* wcsmbs/wcsncpy.c: Use WCSNCPY if defined.

	* sysdeps/s390/multiarch/ifunc-impl-list.c

	(__libc_ifunc_impl_list): Add ifunc test for strncpy, wcsncpy.

	* string/test-strncpy.c: Add wcsncpy support.

	* wcsmbs/test-wcsncpy.c: New File.

	* wcsmbs/Makefile (strop-tests): Add wcsncpy.

	* benchtests/bench-strncpy.c: Add wcsncpy support.

	* benchtests/bench-wcsncpy.c: New File.

	* benchtests/Makefile (wcsmbs-bench): Add wcsncpy

---

 benchtests/Makefile                      |   2 +-

 benchtests/bench-strncpy.c               | 108 ++++++++++-----

 benchtests/bench-wcsncpy.c               |  20 +++

 string/test-strncpy.c                    | 129 +++++++++++-------

 sysdeps/s390/multiarch/Makefile          |   6 +-

 sysdeps/s390/multiarch/ifunc-impl-list.c |   3 +

 sysdeps/s390/multiarch/strncpy-vx.S      | 207 ++++++++++++++++++++++++++++

 sysdeps/s390/multiarch/strncpy.c         |  24 ++++

 sysdeps/s390/multiarch/wcsncpy-c.c       |  25 ++++

 sysdeps/s390/multiarch/wcsncpy-vx.S      | 223 +++++++++++++++++++++++++++++++

 sysdeps/s390/multiarch/wcsncpy.c         |  28 ++++

 sysdeps/s390/s390-32/multiarch/strncpy.c |  21 +++

 sysdeps/s390/s390-64/multiarch/strncpy.c |  21 +++

 wcsmbs/Makefile                          |   2 +-

 wcsmbs/test-wcsncpy-ifunc.c              |  20 +++

 wcsmbs/test-wcsncpy.c                    |  20 +++

 wcsmbs/wcsncpy.c                         |   5 +

 17 files changed, 778 insertions(+), 86 deletions(-)

 create mode 100644 benchtests/bench-wcsncpy.c

 create mode 100644 sysdeps/s390/multiarch/strncpy-vx.S

 create mode 100644 sysdeps/s390/multiarch/strncpy.c

 create mode 100644 sysdeps/s390/multiarch/wcsncpy-c.c

 create mode 100644 sysdeps/s390/multiarch/wcsncpy-vx.S

 create mode 100644 sysdeps/s390/multiarch/wcsncpy.c

 create mode 100644 sysdeps/s390/s390-32/multiarch/strncpy.c

 create mode 100644 sysdeps/s390/s390-64/multiarch/strncpy.c

 create mode 100644 wcsmbs/test-wcsncpy-ifunc.c

 create mode 100644 wcsmbs/test-wcsncpy.c

diff --git a/benchtests/Makefile b/benchtests/Makefile

index 1b491c6..f898258 100644

--- a/benchtests/Makefile

+++ b/benchtests/Makefile

@@ -38,7 +38,7 @@ string-bench := bcopy bzero memccpy memchr memcmp memcpy memmem memmove \

 		strcat strchr strchrnul strcmp strcpy strcspn strlen \

 		strncasecmp strncat strncmp strncpy strnlen strpbrk strrchr \

 		strspn strstr strcpy_chk stpcpy_chk memrchr strsep strtok

-wcsmbs-bench := wcslen wcsnlen wcscpy wcpcpy

+wcsmbs-bench := wcslen wcsnlen wcscpy wcpcpy wcsncpy

 string-bench-all := $(string-bench) ${wcsmbs-bench}

 stdlib-bench := strtod

diff --git a/benchtests/bench-strncpy.c b/benchtests/bench-strncpy.c

index 645925b..2cfd56a 100644

--- a/benchtests/bench-strncpy.c

+++ b/benchtests/bench-strncpy.c

@@ -1,5 +1,5 @@

 /* Measure strncpy functions.

-   Copyright (C) 2013 Free Software Foundation, Inc.

+   Copyright (C) 2013-2015 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

@@ -16,23 +16,56 @@

    License along with the GNU C Library; if not, see

    <http://www.gnu.org/licenses/>.  */

+#ifdef WIDE

+# include <wchar.h>

+# define CHAR wchar_t

+# define UCHAR wchar_t

+# define BIG_CHAR WCHAR_MAX

+# define SMALL_CHAR 1273

+# define MEMCMP wmemcmp

+# define MEMSET wmemset

+# define STRNLEN wcsnlen

+#else

+# define CHAR char

+# define UCHAR unsigned char

+# define BIG_CHAR CHAR_MAX

+# define SMALL_CHAR 127

+# define MEMCMP memcmp

+# define MEMSET memset

+# define STRNLEN strnlen

+#endif /* !WIDE */

+

 #ifndef STRNCPY_RESULT

 # define STRNCPY_RESULT(dst, len, n) dst

 # define TEST_MAIN

-# define TEST_NAME "strncpy"

+# ifndef WIDE

+#  define TEST_NAME "strncpy"

+# else

+#  define TEST_NAME "wcsncpy"

+# endif /* WIDE */

 # include "bench-string.h"

-char *simple_strncpy (char *, const char *, size_t);

-char *stupid_strncpy (char *, const char *, size_t);

-

-IMPL (stupid_strncpy, 0)

-IMPL (simple_strncpy, 0)

-IMPL (strncpy, 1)

-

-char *

-simple_strncpy (char *dst, const char *src, size_t n)

+# ifndef WIDE

+#  define SIMPLE_STRNCPY simple_strncpy

+#  define STUPID_STRNCPY stupid_strncpy

+#  define STRNCPY strncpy

+# else

+#  define SIMPLE_STRNCPY simple_wcsncpy

+#  define STUPID_STRNCPY stupid_wcsncpy

+#  define STRNCPY wcsncpy

+# endif /* WIDE */

+

+CHAR *SIMPLE_STRNCPY (CHAR *, const CHAR *, size_t);

+CHAR *STUPID_STRNCPY (CHAR *, const CHAR *, size_t);

+

+IMPL (STUPID_STRNCPY, 0)

+IMPL (SIMPLE_STRNCPY, 0)

+IMPL (STRNCPY, 1)

+

+CHAR *

+SIMPLE_STRNCPY (CHAR *dst, const CHAR *src, size_t n)

 {

-  char *ret = dst;

+  CHAR *ret = dst;

   while (n--)

     if ((*dst++ = *src++) == '\0')

       {

@@ -43,10 +76,10 @@ simple_strncpy (char *dst, const char *src, size_t n)

   return ret;

 }

-char *

-stupid_strncpy (char *dst, const char *src, size_t n)

+CHAR *

+STUPID_STRNCPY (CHAR *dst, const CHAR *src, size_t n)

 {

-  size_t nc = strnlen (src, n);

+  size_t nc = STRNLEN (src, n);

   size_t i;

   for (i = 0; i < nc; ++i)

@@ -55,12 +88,12 @@ stupid_strncpy (char *dst, const char *src, size_t n)

     dst[i] = '\0';

   return dst;

 }

-#endif

+#endif /* !STRNCPY_RESULT */

-typedef char *(*proto_t) (char *, const char *, size_t);

+typedef CHAR *(*proto_t) (CHAR *, const CHAR *, size_t);

 static void

-do_one_test (impl_t *impl, char *dst, const char *src, size_t len, size_t n)

+do_one_test (impl_t *impl, CHAR *dst, const CHAR *src, size_t len, size_t n)

 {

   size_t i, iters = INNER_LOOP_ITERS;

   timing_t start, stop, cur;

@@ -73,7 +106,7 @@ do_one_test (impl_t *impl, char *dst, const char *src, size_t len, size_t n)

       return;

     }

-  if (memcmp (dst, src, len > n ? n : len) != 0)

+  if (memcmp (dst, src, (len > n ? n : len) * sizeof (CHAR)) != 0)

     {

       error (0, 0, "Wrong result in function %s", impl->name);

       ret = 1;

@@ -109,23 +142,24 @@ static void

 do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char)

 {

   size_t i;

-  char *s1, *s2;

+  CHAR *s1, *s2;

   align1 &= 7;

-  if (align1 + len >= page_size)

+  if ((align1 + len) * sizeof (CHAR) >= page_size)

     return;

   align2 &= 7;

-  if (align2 + len >= page_size)

+  if ((align2 + len) * sizeof (CHAR) >= page_size)

     return;

-  s1 = (char *) (buf1 + align1);

-  s2 = (char *) (buf2 + align2);

+  s1 = (CHAR *) (buf1 + align1);

+  s2 = (CHAR *) (buf2 + align2);

   for (i = 0; i < len; ++i)

     s1[i] = 32 + 23 * i % (max_char - 32);

   s1[len] = 0;

-  for (i = len + 1; i + align1 < page_size && i < len + 64; ++i)

+  for (i = len + 1; (i + align1) * sizeof (CHAR) < page_size && i < len + 64;

+       ++i)

     s1[i] = 32 + 32 * i % (max_char - 32);

   printf ("Length %4zd, n %4zd, alignment %2zd/%2zd:", len, n, align1, align2);

@@ -150,22 +184,22 @@ test_main (void)

   for (i = 1; i < 8; ++i)

     {

-      do_test (i, i, 16, 16, 127);

-      do_test (i, i, 16, 16, 255);

-      do_test (i, 2 * i, 16, 16, 127);

-      do_test (2 * i, i, 16, 16, 255);

-      do_test (8 - i, 2 * i, 1 << i, 2 << i, 127);

-      do_test (2 * i, 8 - i, 2 << i, 1 << i, 127);

-      do_test (8 - i, 2 * i, 1 << i, 2 << i, 255);

-      do_test (2 * i, 8 - i, 2 << i, 1 << i, 255);

+      do_test (i, i, 16, 16, SMALL_CHAR);

+      do_test (i, i, 16, 16, BIG_CHAR);

+      do_test (i, 2 * i, 16, 16, SMALL_CHAR);

+      do_test (2 * i, i, 16, 16, BIG_CHAR);

+      do_test (8 - i, 2 * i, 1 << i, 2 << i, SMALL_CHAR);

+      do_test (2 * i, 8 - i, 2 << i, 1 << i, SMALL_CHAR);

+      do_test (8 - i, 2 * i, 1 << i, 2 << i, BIG_CHAR);

+      do_test (2 * i, 8 - i, 2 << i, 1 << i, BIG_CHAR);

     }

   for (i = 1; i < 8; ++i)

     {

-      do_test (0, 0, 4 << i, 8 << i, 127);

-      do_test (0, 0, 16 << i, 8 << i, 127);

-      do_test (8 - i, 2 * i, 4 << i, 8 << i, 127);

-      do_test (8 - i, 2 * i, 16 << i, 8 << i, 127);

+      do_test (0, 0, 4 << i, 8 << i, SMALL_CHAR);

+      do_test (0, 0, 16 << i, 8 << i, SMALL_CHAR);

+      do_test (8 - i, 2 * i, 4 << i, 8 << i, SMALL_CHAR);

+      do_test (8 - i, 2 * i, 16 << i, 8 << i, SMALL_CHAR);

     }

   return ret;

diff --git a/benchtests/bench-wcsncpy.c b/benchtests/bench-wcsncpy.c

new file mode 100644

index 0000000..d6f63c9

--- /dev/null

+++ b/benchtests/bench-wcsncpy.c

@@ -0,0 +1,20 @@

+/* Measure wcsncpy functions.

+   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 WIDE 1

+#include "bench-strncpy.c"

diff --git a/string/test-strncpy.c b/string/test-strncpy.c

index a623093..bdccc98 100644

--- a/string/test-strncpy.c

+++ b/string/test-strncpy.c

@@ -17,23 +17,56 @@

    License along with the GNU C Library; if not, see

    <http://www.gnu.org/licenses/>.  */

+#ifdef WIDE

+# include <wchar.h>

+# define CHAR wchar_t

+# define UCHAR wchar_t

+# define BIG_CHAR WCHAR_MAX

+# define SMALL_CHAR 1273

+# define MEMCMP wmemcmp

+# define MEMSET wmemset

+# define STRNLEN wcsnlen

+#else

+# define CHAR char

+# define UCHAR unsigned char

+# define BIG_CHAR CHAR_MAX

+# define SMALL_CHAR 127

+# define MEMCMP memcmp

+# define MEMSET memset

+# define STRNLEN strnlen

+#endif /* !WIDE */

+

+

 #ifndef STRNCPY_RESULT

 # define STRNCPY_RESULT(dst, len, n) dst

 # define TEST_MAIN

-# define TEST_NAME "strncpy"

+# ifndef WIDE

+#  define TEST_NAME "strncpy"

+# else

+#  define TEST_NAME "wcsncpy"

+# endif /* WIDE */

 # include "test-string.h"

+# ifndef WIDE

+#  define SIMPLE_STRNCPY simple_strncpy

+#  define STUPID_STRNCPY stupid_strncpy

+#  define STRNCPY strncpy

+# else

+#  define SIMPLE_STRNCPY simple_wcsncpy

+#  define STUPID_STRNCPY stupid_wcsncpy

+#  define STRNCPY wcsncpy

+# endif /* WIDE */

-char *simple_strncpy (char *, const char *, size_t);

-char *stupid_strncpy (char *, const char *, size_t);

+CHAR *SIMPLE_STRNCPY (CHAR *, const CHAR *, size_t);

+CHAR *STUPID_STRNCPY (CHAR *, const CHAR *, size_t);

-IMPL (stupid_strncpy, 0)

-IMPL (simple_strncpy, 0)

-IMPL (strncpy, 1)

+IMPL (STUPID_STRNCPY, 0)

+IMPL (SIMPLE_STRNCPY, 0)

+IMPL (STRNCPY, 1)

-char *

-simple_strncpy (char *dst, const char *src, size_t n)

+CHAR *

+SIMPLE_STRNCPY (CHAR *dst, const CHAR *src, size_t n)

 {

-  char *ret = dst;

+  CHAR *ret = dst;

   while (n--)

     if ((*dst++ = *src++) == '\0')

       {

@@ -44,10 +77,10 @@ simple_strncpy (char *dst, const char *src, size_t n)

   return ret;

 }

-char *

-stupid_strncpy (char *dst, const char *src, size_t n)

+CHAR *

+STUPID_STRNCPY (CHAR *dst, const CHAR *src, size_t n)

 {

-  size_t nc = strnlen (src, n);

+  size_t nc = STRNLEN (src, n);

   size_t i;

   for (i = 0; i < nc; ++i)

@@ -56,12 +89,12 @@ stupid_strncpy (char *dst, const char *src, size_t n)

     dst[i] = '\0';

   return dst;

 }

-#endif

+#endif /* !STRNCPY_RESULT */

-typedef char *(*proto_t) (char *, const char *, size_t);

+typedef CHAR *(*proto_t) (CHAR *, const CHAR *, size_t);

 static void

-do_one_test (impl_t *impl, char *dst, const char *src, size_t len, size_t n)

+do_one_test (impl_t *impl, CHAR *dst, const char *src, size_t len, size_t n)

 {

   if (CALL (impl, dst, src, n) != STRNCPY_RESULT (dst, len, n))

     {

@@ -71,7 +104,7 @@ do_one_test (impl_t *impl, char *dst, const char *src, size_t len, size_t n)

       return;

     }

-  if (memcmp (dst, src, len > n ? n : len) != 0)

+  if (memcmp (dst, src, (len > n ? n : len) * sizeof (CHAR)) != 0)

     {

       error (0, 0, "Wrong result in function %s", impl->name);

       ret = 1;

@@ -96,23 +129,26 @@ static void

 do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char)

 {

   size_t i;

-  char *s1, *s2;

+  CHAR *s1, *s2;

+/* For wcsncpy: align1 and align2 here mean alignment not in bytes,

+   but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t)).  */

   align1 &= 7;

-  if (align1 + len >= page_size)

+  if ((align1 + len) * sizeof (CHAR) >= page_size)

     return;

   align2 &= 7;

-  if (align2 + len >= page_size)

+  if ((align2 + len) * sizeof (CHAR) >= page_size)

     return;

-  s1 = (char *) (buf1 + align1);

-  s2 = (char *) (buf2 + align2);

+  s1 = (CHAR *) (buf1) + align1;

+  s2 = (CHAR *) (buf2) + align2;

   for (i = 0; i < len; ++i)

     s1[i] = 32 + 23 * i % (max_char - 32);

   s1[len] = 0;

-  for (i = len + 1; i + align1 < page_size && i < len + 64; ++i)

+  for (i = len + 1; (i + align1) * sizeof (CHAR) < page_size && i < len + 64;

+       ++i)

     s1[i] = 32 + 32 * i % (max_char - 32);

   FOR_EACH_IMPL (impl, 0)

@@ -123,12 +159,16 @@ static void

 do_random_tests (void)

 {

   size_t i, j, n, align1, align2, len, size, mode;

-  unsigned char *p1 = buf1 + page_size - 512;

-  unsigned char *p2 = buf2 + page_size - 512;

-  unsigned char *res;

+  UCHAR *p1 = (UCHAR *) (buf1 + page_size) - 512;

+  UCHAR *p2 = (UCHAR *) (buf2 + page_size) - 512;

+  UCHAR *res;

   for (n = 0; n < ITERATIONS; n++)

     {

+      /* For wcsncpy: align1 and align2 here mean align not in bytes,

+	 but in wchar_ts, in bytes it will equal to align * (sizeof

+	 (wchar_t)).  */

+

       mode = random ();

       if (mode & 1)

 	{

@@ -166,7 +206,7 @@ do_random_tests (void)

 	    {

 	      size = random () & 511;

 	      if (size + j > 512)

-		size = 512 - j - (random() & 31);

+		size = 512 - j - (random () & 31);

 	    }

 	  else

 	    size = 512 - j;

@@ -182,18 +222,17 @@ do_random_tests (void)

 	    p1[i] = 0;

 	  else

 	    {

-	      p1[i] = random () & 255;

+	      p1[i] = random () & BIG_CHAR;

 	      if (i >= align1 && i < len + align1 && !p1[i])

-		p1[i] = (random () & 127) + 3;

+		p1[i] = (random () & SMALL_CHAR) + 3;

 	    }

 	}

       FOR_EACH_IMPL (impl, 1)

 	{

-	  memset (p2 - 64, '\1', 512 + 64);

-	  res = (unsigned char *) CALL (impl,

-					(char *) (p2 + align2),

-					(char *) (p1 + align1), size);

+	  MEMSET (p2 - 64, '\1', 512 + 64);

+	  res = (UCHAR *) CALL (impl, (CHAR *) (p2 + align2),

+				(CHAR *) (p1 + align1), size);

 	  if (res != STRNCPY_RESULT (p2 + align2, len, size))

 	    {

 	      error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p",

@@ -235,7 +274,7 @@ do_random_tests (void)

 	  j = len + 1;

 	  if (size < j)

 	    j = size;

-	  if (memcmp (p1 + align1, p2 + align2, j))

+	  if (MEMCMP (p1 + align1, p2 + align2, j))

 	    {

 	      error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd)",

 		     n, impl->name, align1, align2, len);

@@ -259,22 +298,22 @@ test_main (void)

   for (i = 1; i < 8; ++i)

     {

-      do_test (i, i, 16, 16, 127);

-      do_test (i, i, 16, 16, 255);

-      do_test (i, 2 * i, 16, 16, 127);

-      do_test (2 * i, i, 16, 16, 255);

-      do_test (8 - i, 2 * i, 1 << i, 2 << i, 127);

-      do_test (2 * i, 8 - i, 2 << i, 1 << i, 127);

-      do_test (8 - i, 2 * i, 1 << i, 2 << i, 255);

-      do_test (2 * i, 8 - i, 2 << i, 1 << i, 255);

+      do_test (i, i, 16, 16, SMALL_CHAR);

+      do_test (i, i, 16, 16, BIG_CHAR);

+      do_test (i, 2 * i, 16, 16, SMALL_CHAR);

+      do_test (2 * i, i, 16, 16, BIG_CHAR);

+      do_test (8 - i, 2 * i, 1 << i, 2 << i, SMALL_CHAR);

+      do_test (2 * i, 8 - i, 2 << i, 1 << i, SMALL_CHAR);

+      do_test (8 - i, 2 * i, 1 << i, 2 << i, BIG_CHAR);

+      do_test (2 * i, 8 - i, 2 << i, 1 << i, BIG_CHAR);

     }

   for (i = 1; i < 8; ++i)

     {

-      do_test (0, 0, 4 << i, 8 << i, 127);

-      do_test (0, 0, 16 << i, 8 << i, 127);

-      do_test (8 - i, 2 * i, 4 << i, 8 << i, 127);

-      do_test (8 - i, 2 * i, 16 << i, 8 << i, 127);

+      do_test (0, 0, 4 << i, 8 << i, SMALL_CHAR);

+      do_test (0, 0, 16 << i, 8 << i, SMALL_CHAR);

+      do_test (8 - i, 2 * i, 4 << i, 8 << i, SMALL_CHAR);

+      do_test (8 - i, 2 * i, 16 << i, 8 << i, SMALL_CHAR);

     }

   do_random_tests ();

diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile

index 5b57342..0dff2dc 100644

--- a/sysdeps/s390/multiarch/Makefile

+++ b/sysdeps/s390/multiarch/Makefile

@@ -2,12 +2,14 @@ ifeq ($(subdir),string)

 sysdep_routines += strlen strlen-vx strlen-c \

 		   strnlen strnlen-vx strnlen-c \

 		   strcpy strcpy-vx \

-		   stpcpy stpcpy-vx stpcpy-c

+		   stpcpy stpcpy-vx stpcpy-c \

+		   strncpy strncpy-vx

 endif

 ifeq ($(subdir),wcsmbs)

 sysdep_routines += wcslen wcslen-vx wcslen-c \

 		   wcsnlen wcsnlen-vx wcsnlen-c \

 		   wcscpy wcscpy-vx wcscpy-c \

-		   wcpcpy wcpcpy-vx wcpcpy-c

+		   wcpcpy wcpcpy-vx wcpcpy-c \

+		   wcsncpy wcsncpy-vx wcsncpy-c

 endif

diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c

index a402301..940421d 100644

--- a/sysdeps/s390/multiarch/ifunc-impl-list.c

+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c

@@ -91,6 +91,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,

   IFUNC_VX_IMPL (stpcpy);

   IFUNC_VX_IMPL (wcpcpy);

+  IFUNC_VX_IMPL (strncpy);

+  IFUNC_VX_IMPL (wcsncpy);

+

 #endif /* HAVE_S390_VX_ASM_SUPPORT */

   return i;

diff --git a/sysdeps/s390/multiarch/strncpy-vx.S b/sysdeps/s390/multiarch/strncpy-vx.S

new file mode 100644

index 0000000..c18b9b7

--- /dev/null

+++ b/sysdeps/s390/multiarch/strncpy-vx.S

@@ -0,0 +1,207 @@

+/* Vector optimized 32/64 bit S/390 version of strncpy.

+   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/>.  */

+

+#if defined HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc

+

+# include "sysdep.h"

+# include "asm-syntax.h"

+

+	.text

+

+/* char * strncpy (const char *dest, const char *src, size_t n)

+   Copy at most n characters of string  src to dest.

+

+   Register usage:

+   -r0=dest pointer for return

+   -r1=tmp, zero byte index

+   -r2=dest

+   -r3=src

+   -r4=n

+   -r5=current_len

+   -r6=tmp, loaded bytes

+   -r7=tmp, border

+   -v16=part of src

+   -v17=index of zero

+   -v18=part of src

+   -v31=register save area for r6, r7

+*/

+ENTRY(__strncpy_vx)

+	.machine "z13"

+	.machinemode "zarch_nohighgprs"

+

+# if !defined __s390x__

+	llgfr	%r4,%r4

+# endif /* !defined __s390x__ */

+

+	clgfi	%r4,0

+	ber	%r14		/* Nothing to do, if n == 0.  */

+	lgr	%r0,%r2		/* Save destination pointer for return.  */

+	vlvgp	%v31,%r6,%r7	/* Save registers.  */

+

+	vlbb	%v16,0(%r3),6	/* Load s until next 4k-byte boundary.  */

+	lcbb	%r6,0(%r3),6	/* Get bytes to 4k-byte boundary or 16.  */

+	llgfr	%r6,%r6		/* Convert 32bit to 64bit.  */

+

+	lghi	%r5,0		/* current_len = 0.  */

+

+	clgrjle	%r4,%r6,.Lremaining_v16 /* If n <= loaded-bytes

+					   -> process remaining.  */

+

+	/* n > loaded-byte-count.  */

+	vfenezb	%v17,%v16,%v16	/* Find element not equal with zero search.  */

+	vlgvb	%r1,%v17,7	/* Load zero index or 16 if not found.  */

+	clrjl	%r1,%r6,.Lfound_v16_store /* Found zero within loaded bytes,

+					     copy and return.  */

+

+	/* Align s to 16 byte.  */

+	risbgn	%r7,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */

+	lghi	%r5,15		/* current_len = 15.  */

+	slr	%r5,%r7		/* Compute highest index to 16byte boundary.  */

+

+	/* Zero not found and n > loaded-byte-count.  */

+	vstl	%v16,%r5,0(%r2)	/* Copy loaded characters - no zero.  */

+	ahi	%r5,1		/* Start loop at next character.  */

+

+	/* Now we are 16byte aligned, so we can load

+	   a full vreg without page fault.  */

+	lgr	%r1,%r5		/* If %r5 + 64 < maxlen? -> loop64.  */

+	aghi	%r1,64

+	clgrjl	%r1,%r4,.Lloop64

+

+	vl	%v16,0(%r5,%r3)	/* Load s.  */

+	clgijl	%r4,17,.Lremaining_v16	/* If n <= 16, process remaining

+					   bytes.  */

+.Llt64:

+	lgr	%r7,%r4

+	slgfi	%r7,16		/* border_len = n - 16.  */

+

+	clgrjhe	%r5,%r7,.Lremaining_v16 /* If current_len >= border

+					   then process remaining bytes.  */

+	vfenezbs %v17,%v16,%v16	/* Find element not equal with zero search.  */

+	je	.Lfound_v16	/* Jump away if zero was found.  */

+	vl	%v18,16(%r5,%r3) /* Load next part of s.  */

+	vst	%v16,0(%r5,%r2)	/* Store previous part without zero to dst.  */

+	aghi	%r5,16

+

+	clgrjhe	%r5,%r7,.Lremaining_v18

+	vfenezbs %v17,%v18,%v18

+	je	.Lfound_v18

+	vl	%v16,16(%r5,%r3)

+	vst	%v18,0(%r5,%r2)

+	aghi	%r5,16

+

+	clgrjhe	%r5,%r7,.Lremaining_v16

+	vfenezbs %v17,%v16,%v16

+	je	.Lfound_v16

+	vl	%v18,16(%r5,%r3)

+	vst	%v16,0(%r5,%r2)

+	aghi	%r5,16

+

+.Lremaining_v18:

+	vlr	%v16,%v18

+.Lremaining_v16:

+	/* v16 contains the remaining bytes [1...16].

+	   Store remaining bytes and append string-termination.  */

+	vfenezb	%v17,%v16,%v16	/* Find element not equal with zero search.  */

+	slgrk	%r7,%r4,%r5	/* Remaining bytes = maxlen - current_len.  */

+	aghi	%r7,-1		/* vstl needs highest index.  */

+	la	%r2,0(%r5,%r2)	/* vstl has no index register.  */

+	vlgvb	%r1,%v17,7	/* Load zero index or 16 if not found.  */

+	/* Zero in remaining bytes? -> jump away (zero-index < max-index)

+	   Do not jump away if zero-index == max-index,

+	   but simply copy zero with vstl below.  */

+	clrjl	%r1,%r7,.Lfound_v16_store

+	vstl	%v16,%r7,0(%r2)	/* Store remaining bytes without null

+				   termination!.  */

+.Lend:

+	/* Restore saved registers.  */

+	vlgvg	%r6,%v31,0

+	vlgvg	%r7,%v31,1

+	lgr	%r2,%r0		/* Load saved dest-ptr.  */

+	br	%r14

+

+

+.Lfound_v16_32:

+	aghi	%r5,32

+	j	.Lfound_v16

+.Lfound_v18_48:

+	aghi	%r5,32

+.Lfound_v18_16:

+	aghi	%r5,16

+.Lfound_v18:

+	vlr	%v16,%v18

+.Lfound_v16:

+	/* v16 contains a zero. Store remaining bytes to zero. current_len

+	   has not reached border, thus checking for n is not needed! */

+	vlgvb	%r1,%v17,7	/* Load byte index of zero.  */

+	la	%r2,0(%r5,%r2)	/* vstl has no support for index-register.  */

+.Lfound_v16_store:

+	vstl	%v16,%r1,0(%r2)	/* Copy characters including zero.  */

+	/* Fill remaining bytes with zero - remaining count always > 0.  */