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From 130a0ae7cad6bc7a2d102624027a1d8de19cc3b3 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 13:21:11 +0200
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Subject: [PATCH 27/30] S390: Optimize memccpy.
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upstream-commit-id: 9b593dc3055d44a4179c03050be58a437ae385a1
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https://www.sourceware.org/ml/libc-alpha/2015-07/msg00100.html
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This patch provides optimized versions of memccpy with the z13 vector
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instructions.
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ChangeLog:
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* sysdeps/s390/multiarch/memccpy-c.c: New File.
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* sysdeps/s390/multiarch/memccpy-vx.S: Likewise.
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* sysdeps/s390/multiarch/memccpy.c: Likewise.
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* sysdeps/s390/multiarch/Makefile
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(sysdep_routines): Add memccpy functions.
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* sysdeps/s390/multiarch/ifunc-impl-list-common.c
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(__libc_ifunc_impl_list_common): Add ifunc test for memccpy.
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* string/memccpy.c: Use MEMCCPY if defined.
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---
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string/memccpy.c | 4 +
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sysdeps/s390/multiarch/Makefile | 3 +-
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sysdeps/s390/multiarch/ifunc-impl-list.c | 2 +
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sysdeps/s390/multiarch/memccpy-c.c | 27 ++++++
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sysdeps/s390/multiarch/memccpy-vx.S | 156 +++++++++++++++++++++++++++++++
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sysdeps/s390/multiarch/memccpy.c | 28 ++++++
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6 files changed, 219 insertions(+), 1 deletion(-)
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create mode 100644 sysdeps/s390/multiarch/memccpy-c.c
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create mode 100644 sysdeps/s390/multiarch/memccpy-vx.S
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create mode 100644 sysdeps/s390/multiarch/memccpy.c
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diff --git a/string/memccpy.c b/string/memccpy.c
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index a8649ff..78c13b6 100644
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--- a/string/memccpy.c
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+++ b/string/memccpy.c
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@@ -20,6 +20,10 @@
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#undef __memccpy
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#undef memccpy
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+#ifdef MEMCCPY
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+# define __memccpy MEMCCPY
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+#endif
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+
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/* Copy no more than N bytes of SRC to DEST, stopping when C is found.
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Return the position in DEST one byte past where C was copied, or
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NULL if C was not found in the first N bytes of SRC. */
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diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
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index 4a04c34..87dff0f 100644
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--- a/sysdeps/s390/multiarch/Makefile
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+++ b/sysdeps/s390/multiarch/Makefile
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@@ -16,7 +16,8 @@ sysdep_routines += strlen strlen-vx strlen-c \
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strpbrk strpbrk-vx strpbrk-c \
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strcspn strcspn-vx strcspn-c \
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memchr memchr-vx \
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- rawmemchr rawmemchr-vx rawmemchr-c
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+ rawmemchr rawmemchr-vx rawmemchr-c \
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+ memccpy memccpy-vx memccpy-c
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endif
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ifeq ($(subdir),wcsmbs)
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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 d4c7c0d..c90fb6b 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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@@ -131,6 +131,8 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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IFUNC_VX_IMPL (wmemchr);
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IFUNC_VX_IMPL (rawmemchr);
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+ IFUNC_VX_IMPL (memccpy);
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+
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#endif /* HAVE_S390_VX_ASM_SUPPORT */
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return i;
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diff --git a/sysdeps/s390/multiarch/memccpy-c.c b/sysdeps/s390/multiarch/memccpy-c.c
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new file mode 100644
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index 0000000..4d07b63
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--- /dev/null
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+++ b/sysdeps/s390/multiarch/memccpy-c.c
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@@ -0,0 +1,27 @@
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+/* Default memccpy 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 MEMCCPY __memccpy_c
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+# undef weak_alias
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+# define weak_alias(a, b)
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+
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+# include <string.h>
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+extern __typeof (__memccpy) __memccpy_c;
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+# include <string/memccpy.c>
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+#endif
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diff --git a/sysdeps/s390/multiarch/memccpy-vx.S b/sysdeps/s390/multiarch/memccpy-vx.S
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new file mode 100644
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index 0000000..b1dc69c
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--- /dev/null
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+++ b/sysdeps/s390/multiarch/memccpy-vx.S
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@@ -0,0 +1,156 @@
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+/* Vector optimized 32/64 bit S/390 version of memccpy.
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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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+/* void *memccpy (void * dest, const void *src, int c, size_t n)
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+ Copies no more than n bytes from src to dest,
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+ stopping when the character c is found
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+ and returns pointer next to c in dest or null if c not found.
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+
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+ Register usage:
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+ -r0=tmp
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+ -r1=tmp
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+ -r2=dest
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+ -r3=src
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+ -r4=c
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+ -r5=n
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+ -r6=current_len
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+ -v16=part of s
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+ -v17=index of found c
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+ -v18=c replicated
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+ -v19=part #2 of s
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+ -v31=save area for r6
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+*/
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+ENTRY(__memccpy_vx)
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+ .machine "z13"
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+ .machinemode "zarch_nohighgprs"
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+
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+# if !defined __s390x__
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+ llgfr %r5,%r5
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+# endif /* !defined __s390x__ */
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+
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+ vlvgp %v31,%r6,%r7 /* Save registers. */
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+ clgije %r5,0,.Lnf_end /* If len == 0 then exit. */
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+
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+ vlbb %v16,0(%r3),6 /* Load s until next 4k-byte boundary. */
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+ lcbb %r0,0(%r3),6 /* Get bytes to 4k-byte boundary or 16. */
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+ llgfr %r0,%r0 /* Convert 32bit to 64bit. */
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+
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+ vlvgb %v18,%r4,0 /* Generate vector which elements are all c.
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+ if c > 255, c will be truncated. */
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+ vrepb %v18,%v18,0
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+ lghi %r6,0 /* current_len = 0. */
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+
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+ clgrjle %r5,%r0,.Lremaining_v16 /* If maxlen <= loaded-bytes
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+ -> Process remaining. */
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+
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+ vfeebs %v17,%v16,%v18 /* Find c. */
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+ vlgvb %r1,%v17,7 /* Load byte index of c. */
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+ clgrjl %r1,%r0,.Lfound_v16 /* Found c is within loaded bytes. */
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+
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+ /* Align s to 16 byte. */
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+ risbgn %r1,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
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+ lghi %r6,15 /* current_len = 15. */
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+ slr %r6,%r1 /* Compute highest index to 16byte boundary. */
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+
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+ vstl %v16,%r6,0(%r2) /* Store prcessed bytes */
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+ ahi %r6,1
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+
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+.Lpreloop1:
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+ /* Now we are 16byte aligned, so we can load
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+ a full vreg without page fault. */
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+ vl %v16,0(%r6,%r3) /* Load s. */
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+ clgijl %r5,17,.Lremaining_v16 /* If n <= 16,
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+ process remaining bytes. */
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+ lgr %r7,%r5
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+ slgfi %r7,16 /* border_len = n - 16. */
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+ j .Lloop1
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+
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+.Lloop2:
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+ vl %v16,16(%r6,%r3)
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+ vst %v19,0(%r6,%r2)
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+ aghi %r6,16
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+
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+.Lloop1:
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+ clgrjhe %r6,%r7,.Lremaining_v16 /* If current_len >= border
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+ then process remaining bytes. */
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+ vfeebs %v17,%v16,%v18 /* Find c. */
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+ jl .Lfound_v16 /* Jump away if c was found. */
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+ vl %v19,16(%r6,%r3) /* Load next s part. */
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+ vst %v16,0(%r6,%r2) /* Store previous part without c. */
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+ aghi %r6,16
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+
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+ clgrjhe %r6,%r7,.Lremaining_v19
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+ vfeebs %v17,%v19,%v18
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+ jl .Lfound_v19
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+ vl %v16,16(%r6,%r3)
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+ vst %v19,0(%r6,%r2)
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+ aghi %r6,16
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+
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+ clgrjhe %r6,%r7,.Lremaining_v16
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+ vfeebs %v17,%v16,%v18
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+ jl .Lfound_v16
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+ vl %v19,16(%r6,%r3)
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+ vst %v16,0(%r6,%r2)
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+ aghi %r6,16
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+
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+ clgrjhe %r6,%r7,.Lremaining_v19
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+ vfeebs %v17,%v19,%v18
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+ jo .Lloop2
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+
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+.Lfound_v19:
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+ vlr %v16,%v19
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+.Lfound_v16:
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+ /* v16 contains c. Store remaining bytes to c. currlen hasn´t
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+ reached border, thus checking for maxlen is not needed! */
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+ vlgvb %r1,%v17,7 /* Load byte index of c. */
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+ la %r2,0(%r6,%r2) /* vstl has no support for index-register. */
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+.Lfound_v16_store:
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+ vstl %v16,%r1,0(%r2) /* Copy bytes including c. */
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+ la %r2,1(%r1,%r2) /* Return pointer next to c in dest. */
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+ vlgvg %r6,%v31,0
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+ vlgvg %r7,%v31,1
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+ br %r14
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+
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+.Lremaining_v19:
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+ vlr %v16,%v19
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+.Lremaining_v16:
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+ /* v16 contains the remaining bytes [1...16].
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+ Check and store remaining bytes. */
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+ vfeebs %v17,%v16,%v18
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+ slgrk %r7,%r5,%r6 /* Remaining bytes = maxlen - current_len. */
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+ aghi %r7,-1 /* vstl needs highest index. */
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+ la %r2,0(%r6,%r2) /* vstl has no index register. */
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+ vlgvb %r1,%v17,7 /* Load index of c or 16 if not found. */
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+ /* c in remaining bytes? -> Jump away (c-index <= max-index) */
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+ clrjle %r1,%r7,.Lfound_v16_store
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+ vstl %v16,%r7,0(%r2) /* Store remaining bytes. */
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+
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+.Lnf_end:
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+ vlgvg %r6,%v31,0
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+ vlgvg %r7,%v31,1
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+ lghi %r2,0 /* Return null. */
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+ br %r14
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+END(__memccpy_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/memccpy.c b/sysdeps/s390/multiarch/memccpy.c
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new file mode 100644
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index 0000000..746bc25
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--- /dev/null
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+++ b/sysdeps/s390/multiarch/memccpy.c
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@@ -0,0 +1,28 @@
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+/* Multiple versions of memccpy.
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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_ifunc (__memccpy)
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+weak_alias (__memccpy, memccpy)
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+
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+#else
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+# include <string/memccpy.c>
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+#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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|