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479 lines
16 KiB
479 lines
16 KiB
From cca51a74315c37614042113b004505b150d305d7 Mon Sep 17 00:00:00 2001 |
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From: Stefan Liebler <stli@linux.vnet.ibm.com> |
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Date: Thu, 8 Oct 2015 10:54:21 +0200 |
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Subject: [PATCH 10/30] S390: Optimize strlen and wcslen. |
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upstream-commit-id: 9472f35a0a6dbbda82ce103aaf0f5013f5d46e34 |
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https://www.sourceware.org/ml/libc-alpha/2015-07/msg00089.html |
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This patch provides optimized versions of strlen and wcslen with the z13 vector |
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instructions. |
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The helper macro IFUNC_VX_IMPL is introduced and is used to register all |
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__<func>_c() and __<func>_vx() functions within __libc_ifunc_impl_list() |
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to the ifunc test framework. |
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ChangeLog: |
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* sysdeps/s390/multiarch/Makefile: New File. |
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* sysdeps/s390/multiarch/strlen-c.c: Likewise. |
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* sysdeps/s390/multiarch/strlen-vx.S: Likewise. |
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* sysdeps/s390/multiarch/strlen.c: Likewise. |
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* sysdeps/s390/multiarch/wcslen-c.c: Likewise. |
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* sysdeps/s390/multiarch/wcslen-vx.S: Likewise. |
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* sysdeps/s390/multiarch/wcslen.c: Likewise. |
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* string/strlen.c (STRLEN): Define and use macro. |
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* sysdeps/s390/multiarch/ifunc-impl-list.c |
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(IFUNC_VX_IMPL): New macro function. |
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(__libc_ifunc_impl_list): Add ifunc test for strlen, wcslen. |
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* benchtests/Makefile (wcsmbs-bench): New variable. |
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(string-bench-all): Added wcsmbs-bench. |
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* benchtests/bench-wcslen.c: New File. |
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--- |
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benchtests/Makefile | 3 +- |
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benchtests/bench-wcslen.c | 20 +++++++ |
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string/strlen.c | 7 ++- |
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sysdeps/s390/multiarch/Makefile | 7 +++ |
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sysdeps/s390/multiarch/ifunc-impl-list.c | 14 +++++ |
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sysdeps/s390/multiarch/strlen-c.c | 28 ++++++++++ |
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sysdeps/s390/multiarch/strlen-vx.S | 84 +++++++++++++++++++++++++++++ |
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sysdeps/s390/multiarch/strlen.c | 27 ++++++++++ |
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sysdeps/s390/multiarch/wcslen-c.c | 25 +++++++++ |
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sysdeps/s390/multiarch/wcslen-vx.S | 91 ++++++++++++++++++++++++++++++++ |
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sysdeps/s390/multiarch/wcslen.c | 28 ++++++++++ |
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11 files changed, 331 insertions(+), 3 deletions(-) |
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create mode 100644 benchtests/bench-wcslen.c |
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create mode 100644 sysdeps/s390/multiarch/Makefile |
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create mode 100644 sysdeps/s390/multiarch/strlen-c.c |
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create mode 100644 sysdeps/s390/multiarch/strlen-vx.S |
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create mode 100644 sysdeps/s390/multiarch/strlen.c |
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create mode 100644 sysdeps/s390/multiarch/wcslen-c.c |
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create mode 100644 sysdeps/s390/multiarch/wcslen-vx.S |
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create mode 100644 sysdeps/s390/multiarch/wcslen.c |
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|
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diff --git a/benchtests/Makefile b/benchtests/Makefile |
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index 9b02bc7..09ab87f 100644 |
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--- a/benchtests/Makefile |
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+++ b/benchtests/Makefile |
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@@ -38,7 +38,8 @@ string-bench := bcopy bzero memccpy memchr memcmp memcpy memmem memmove \ |
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strcat strchr strchrnul strcmp strcpy strcspn strlen \ |
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strncasecmp strncat strncmp strncpy strnlen strpbrk strrchr \ |
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strspn strstr strcpy_chk stpcpy_chk memrchr strsep strtok |
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-string-bench-all := $(string-bench) |
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+wcsmbs-bench := wcslen |
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+string-bench-all := $(string-bench) ${wcsmbs-bench} |
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|
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stdlib-bench := strtod |
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diff --git a/benchtests/bench-wcslen.c b/benchtests/bench-wcslen.c |
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new file mode 100644 |
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index 0000000..4e9d085 |
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--- /dev/null |
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+++ b/benchtests/bench-wcslen.c |
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@@ -0,0 +1,20 @@ |
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+/* Measure wcslen functions. |
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+ Copyright (C) 2015 Free Software Foundation, Inc. |
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+ This file is part of the GNU C Library. |
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+ |
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+ The GNU C Library is free software; you can redistribute it and/or |
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+ modify it under the terms of the GNU Lesser General Public |
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+ License as published by the Free Software Foundation; either |
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+ version 2.1 of the License, or (at your option) any later version. |
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+ |
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+ The GNU C Library is distributed in the hope that it will be useful, |
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of |
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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+ Lesser General Public License for more details. |
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+ |
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+ You should have received a copy of the GNU Lesser General Public |
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+ License along with the GNU C Library; if not, see |
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+ <http://www.gnu.org/licenses/>. */ |
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+ |
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+#define WIDE 1 |
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+#include "bench-strlen.c" |
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diff --git a/string/strlen.c b/string/strlen.c |
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index 5c1efda..d682693 100644 |
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--- a/string/strlen.c |
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+++ b/string/strlen.c |
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@@ -23,11 +23,14 @@ |
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#undef strlen |
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+#ifndef STRLEN |
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+# define STRLEN strlen |
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+#endif |
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+ |
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/* Return the length of the null-terminated string STR. Scan for |
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the null terminator quickly by testing four bytes at a time. */ |
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size_t |
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-strlen (str) |
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- const char *str; |
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+STRLEN (const char *str) |
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{ |
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const char *char_ptr; |
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const unsigned long int *longword_ptr; |
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diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile |
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new file mode 100644 |
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index 0000000..3a98098 |
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--- /dev/null |
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+++ b/sysdeps/s390/multiarch/Makefile |
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@@ -0,0 +1,7 @@ |
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+ifeq ($(subdir),string) |
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+sysdep_routines += strlen strlen-vx strlen-c |
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+endif |
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+ |
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+ifeq ($(subdir),wcsmbs) |
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+sysdep_routines += wcslen wcslen-vx wcslen-c |
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+endif |
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diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c |
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index c330904..e9639ef 100644 |
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--- a/sysdeps/s390/multiarch/ifunc-impl-list.c |
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+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c |
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@@ -18,6 +18,7 @@ |
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#include <assert.h> |
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#include <string.h> |
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+#include <wchar.h> |
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#include <ifunc-impl-list.h> |
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#include <ifunc-resolve.h> |
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@@ -70,5 +71,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, |
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#endif /* SHARED */ |
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+#ifdef HAVE_S390_VX_ASM_SUPPORT |
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+ |
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+# define IFUNC_VX_IMPL(FUNC) \ |
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+ IFUNC_IMPL (i, name, FUNC, \ |
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+ IFUNC_IMPL_ADD (array, i, FUNC, dl_hwcap & HWCAP_S390_VX, \ |
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+ __##FUNC##_vx) \ |
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+ IFUNC_IMPL_ADD (array, i, FUNC, 1, __##FUNC##_c)) |
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+ |
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+ IFUNC_VX_IMPL (strlen); |
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+ IFUNC_VX_IMPL (wcslen); |
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+ |
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+#endif /* HAVE_S390_VX_ASM_SUPPORT */ |
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+ |
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return i; |
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} |
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diff --git a/sysdeps/s390/multiarch/strlen-c.c b/sysdeps/s390/multiarch/strlen-c.c |
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new file mode 100644 |
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index 0000000..1cbe959 |
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--- /dev/null |
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+++ b/sysdeps/s390/multiarch/strlen-c.c |
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@@ -0,0 +1,28 @@ |
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+/* Default strlen implementation for S/390. |
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+ Copyright (C) 2015 Free Software Foundation, Inc. |
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+ This file is part of the GNU C Library. |
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+ |
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+ The GNU C Library is free software; you can redistribute it and/or |
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+ modify it under the terms of the GNU Lesser General Public |
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+ License as published by the Free Software Foundation; either |
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+ version 2.1 of the License, or (at your option) any later version. |
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+ |
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+ The GNU C Library is distributed in the hope that it will be useful, |
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of |
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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+ Lesser General Public License for more details. |
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+ |
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+ You should have received a copy of the GNU Lesser General Public |
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+ License along with the GNU C Library; if not, see |
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+ <http://www.gnu.org/licenses/>. */ |
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+ |
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+#if defined HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc |
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+# define STRLEN __strlen_c |
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+# ifdef SHARED |
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+# undef libc_hidden_builtin_def |
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+# define libc_hidden_builtin_def(name) \ |
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+ __hidden_ver1 (__strlen_c, __GI_strlen, __strlen_c); |
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+# endif /* SHARED */ |
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+ |
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+# include <string/strlen.c> |
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+#endif /* HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc */ |
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diff --git a/sysdeps/s390/multiarch/strlen-vx.S b/sysdeps/s390/multiarch/strlen-vx.S |
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new file mode 100644 |
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index 0000000..1a5cb23 |
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--- /dev/null |
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+++ b/sysdeps/s390/multiarch/strlen-vx.S |
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@@ -0,0 +1,84 @@ |
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+/* Vector optimized 32/64 bit S/390 version of strlen. |
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+ Copyright (C) 2015 Free Software Foundation, Inc. |
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+ This file is part of the GNU C Library. |
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+ |
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+ The GNU C Library is free software; you can redistribute it and/or |
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+ modify it under the terms of the GNU Lesser General Public |
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+ License as published by the Free Software Foundation; either |
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+ version 2.1 of the License, or (at your option) any later version. |
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+ |
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+ The GNU C Library is distributed in the hope that it will be useful, |
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of |
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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+ Lesser General Public License for more details. |
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+ |
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+ You should have received a copy of the GNU Lesser General Public |
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+ License along with the GNU C Library; if not, see |
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+ <http://www.gnu.org/licenses/>. */ |
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+ |
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+#if defined HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc |
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+ |
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+# include "sysdep.h" |
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+# include "asm-syntax.h" |
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+ |
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+ .text |
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+ |
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+/* size_t strlen (const char *s) |
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+ Returns length of string s. |
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+ |
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+ Register usage: |
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+ -r1=bytes to 4k-byte boundary |
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+ -r2=s |
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+ -r3=tmp |
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+ -r4=tmp |
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+ -r5=current_len and return_value |
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+ -v16=part of s |
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+*/ |
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+ENTRY(__strlen_vx) |
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+ .machine "z13" |
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+ .machinemode "zarch_nohighgprs" |
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+ |
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+ vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */ |
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+ lcbb %r1,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */ |
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+ |
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+ vfenezb %v16,%v16,%v16 /* Find element not equal with zero search. */ |
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+ vlgvb %r4,%v16,7 /* Load zero index or 16 if not found. */ |
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+ clr %r4,%r1 /* If found zero within loaded bytes? */ |
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+ locgrl %r2,%r4 /* Then copy return value. */ |
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+ blr %r14 /* And return. */ |
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+ |
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+ /* Align s to 16 byte. */ |
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+ risbgn %r3,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */ |
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+ lghi %r5,16 /* current_len = 16. */ |
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+ slr %r5,%r3 /* Compute bytes to 16bytes boundary. */ |
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+ |
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+ /* Find zero in 16 byte aligned loop. */ |
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+.Lloop: |
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+ vl %v16,0(%r5,%r2) /* Load s. */ |
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+ vfenezbs %v16,%v16,%v16 /* Find element not equal with zero search. */ |
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+ je .Lfound /* Jump away if zero was found. */ |
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+ vl %v16,16(%r5,%r2) |
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+ vfenezbs %v16,%v16,%v16 |
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+ je .Lfound16 |
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+ vl %v16,32(%r5,%r2) |
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+ vfenezbs %v16,%v16,%v16 |
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+ je .Lfound32 |
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+ vl %v16,48(%r5,%r2) |
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+ vfenezbs %v16,%v16,%v16 |
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+ je .Lfound48 |
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+ |
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+ aghi %r5,64 |
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+ j .Lloop /* No zero found -> loop. */ |
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+ |
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+.Lfound48: |
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+ aghi %r5,16 |
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+.Lfound32: |
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+ aghi %r5,16 |
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+.Lfound16: |
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+ aghi %r5,16 |
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+.Lfound: |
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+ vlgvb %r2,%v16,7 /* Load byte index of zero. */ |
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+ algr %r2,%r5 |
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+ br %r14 |
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+END(__strlen_vx) |
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+#endif /* HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc */ |
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diff --git a/sysdeps/s390/multiarch/strlen.c b/sysdeps/s390/multiarch/strlen.c |
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new file mode 100644 |
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index 0000000..ba5863f |
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--- /dev/null |
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+++ b/sysdeps/s390/multiarch/strlen.c |
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@@ -0,0 +1,27 @@ |
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+/* Multiple versions of strlen. |
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+ Copyright (C) 2015 Free Software Foundation, Inc. |
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+ This file is part of the GNU C Library. |
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+ |
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+ The GNU C Library is free software; you can redistribute it and/or |
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+ modify it under the terms of the GNU Lesser General Public |
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+ License as published by the Free Software Foundation; either |
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+ version 2.1 of the License, or (at your option) any later version. |
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+ |
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+ The GNU C Library is distributed in the hope that it will be useful, |
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of |
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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+ Lesser General Public License for more details. |
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+ |
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+ You should have received a copy of the GNU Lesser General Public |
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+ License along with the GNU C Library; if not, see |
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+ <http://www.gnu.org/licenses/>. */ |
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+ |
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+#if defined HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc |
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+# include <string.h> |
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+# include <ifunc-resolve.h> |
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+ |
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+s390_vx_libc_ifunc2 (__strlen, strlen) |
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+ |
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+#else |
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+# include <string/strlen.c> |
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+#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc) */ |
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diff --git a/sysdeps/s390/multiarch/wcslen-c.c b/sysdeps/s390/multiarch/wcslen-c.c |
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new file mode 100644 |
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index 0000000..6dd011e |
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--- /dev/null |
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+++ b/sysdeps/s390/multiarch/wcslen-c.c |
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@@ -0,0 +1,25 @@ |
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+/* Default wcslen implementation for S/390. |
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+ Copyright (C) 2015 Free Software Foundation, Inc. |
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+ This file is part of the GNU C Library. |
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+ |
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+ The GNU C Library is free software; you can redistribute it and/or |
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+ modify it under the terms of the GNU Lesser General Public |
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+ License as published by the Free Software Foundation; either |
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+ version 2.1 of the License, or (at your option) any later version. |
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+ |
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+ The GNU C Library is distributed in the hope that it will be useful, |
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of |
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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+ Lesser General Public License for more details. |
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+ |
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+ You should have received a copy of the GNU Lesser General Public |
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+ License along with the GNU C Library; if not, see |
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+ <http://www.gnu.org/licenses/>. */ |
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+ |
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+#if defined HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc |
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+# define WCSLEN __wcslen_c |
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+ |
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+# include <wchar.h> |
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+extern __typeof (__wcslen) __wcslen_c; |
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+# include <wcsmbs/wcslen.c> |
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+#endif |
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diff --git a/sysdeps/s390/multiarch/wcslen-vx.S b/sysdeps/s390/multiarch/wcslen-vx.S |
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new file mode 100644 |
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index 0000000..579e66b |
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--- /dev/null |
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+++ b/sysdeps/s390/multiarch/wcslen-vx.S |
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@@ -0,0 +1,91 @@ |
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+/* Vector optimized 32/64 bit S/390 version of wcslen. |
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+ Copyright (C) 2015 Free Software Foundation, Inc. |
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+ This file is part of the GNU C Library. |
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+ |
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+ The GNU C Library is free software; you can redistribute it and/or |
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+ modify it under the terms of the GNU Lesser General Public |
|
+ License as published by the Free Software Foundation; either |
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+ version 2.1 of the License, or (at your option) any later version. |
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+ |
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+ 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. |
|
+ |
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+ You should have received a copy of the GNU Lesser General Public |
|
+ License along with the GNU C Library; if not, see |
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+ <http://www.gnu.org/licenses/>. */ |
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+ |
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+#if defined HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc |
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+ |
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+# include "sysdep.h" |
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+# include "asm-syntax.h" |
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+ |
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+ .text |
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+ |
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+/* size_t wcslen (const wchar_t *s) |
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+ Returns length of string s. |
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+ |
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+ Register usage: |
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+ -r1=bytes to 4k-byte boundary |
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+ -r2=s |
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+ -r3=tmp |
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+ -r4=tmp |
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+ -r5=current_len and return_value |
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+ -v16=part of s |
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+*/ |
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+ENTRY(__wcslen_vx) |
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+ .machine "z13" |
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+ .machinemode "zarch_nohighgprs" |
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+ |
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+ vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */ |
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+ lcbb %r1,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */ |
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+ |
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+ tmll %r2,3 /* Test if s is 4-byte aligned? */ |
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+ jne .Lfallback /* And use common-code variant if not. */ |
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+ |
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+ vfenezf %v16,%v16,%v16 /* Find element not equal with zero search. */ |
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+ vlgvb %r4,%v16,7 /* Load zero index or 16 if not found. */ |
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+ clr %r4,%r1 /* If found zero within loaded bytes? */ |
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+ locgrl %r2,%r4 /* Then copy return value. */ |
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+ jl .Lend /* And return. */ |
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+ |
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+ /* Align s to 16 byte. */ |
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+ risbgn %r3,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */ |
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+ lghi %r5,16 /* current_len = 16. */ |
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+ slr %r5,%r3 /* Compute bytes to 16bytes boundary. */ |
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+ |
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+ /* Find zero in 16byte aligned loop. */ |
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+.Lloop: |
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+ vl %v16,0(%r5,%r2) /* Load s. */ |
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+ vfenezfs %v16,%v16,%v16 /* Find element not equal with zero search. */ |
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+ je .Lfound /* Jump away if zero was found. */ |
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+ vl %v16,16(%r5,%r2) |
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+ vfenezfs %v16,%v16,%v16 |
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+ je .Lfound16 |
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+ vl %v16,32(%r5,%r2) |
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+ vfenezfs %v16,%v16,%v16 |
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+ je .Lfound32 |
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+ vl %v16,48(%r5,%r2) |
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+ vfenezfs %v16,%v16,%v16 |
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+ je .Lfound48 |
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+ |
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+ aghi %r5,64 |
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+ j .Lloop /* No zero found -> loop. */ |
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+ |
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+.Lfound48: |
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+ aghi %r5,16 |
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+.Lfound32: |
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+ aghi %r5,16 |
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+.Lfound16: |
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+ aghi %r5,16 |
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+.Lfound: |
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+ vlgvb %r2,%v16,7 /* Load byte index of zero. */ |
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+ algr %r2,%r5 |
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+.Lend: |
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+ srlg %r2,%r2,2 /* Convert byte-count to character-count. */ |
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+ br %r14 |
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+.Lfallback: |
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+ jg __wcslen_c |
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+END(__wcslen_vx) |
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+#endif /* HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc */ |
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diff --git a/sysdeps/s390/multiarch/wcslen.c b/sysdeps/s390/multiarch/wcslen.c |
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new file mode 100644 |
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index 0000000..a7be73e |
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--- /dev/null |
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+++ b/sysdeps/s390/multiarch/wcslen.c |
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@@ -0,0 +1,28 @@ |
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+/* Multiple versions of wcslen. |
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+ 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 |
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+ <http://www.gnu.org/licenses/>. */ |
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+ |
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+#if defined HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc |
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+# include <wchar.h> |
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+# include <ifunc-resolve.h> |
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+ |
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+s390_vx_libc_ifunc (__wcslen) |
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+weak_alias (__wcslen, wcslen) |
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+ |
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+#else |
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+# include <wcsmbs/wcslen.c> |
|
+#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc) */ |
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-- |
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2.3.0 |
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|