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