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From 250962053fadd0911accad515802d9b957c9d019 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 13:24:58 +0200
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Subject: [PATCH 30/30] S390: Optimize memrchr.
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upstream-commit-id: 798f5b4b5d24e5687dd55acc535954ed1d59c10c
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https://www.sourceware.org/ml/libc-alpha/2015-07/msg00092.html
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This patch provides optimized version of memrchr with the z13 vector
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instructions.
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ChangeLog:
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* sysdeps/s390/multiarch/memrchr-c.c: New File.
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* sysdeps/s390/multiarch/memrchr-vx.S: Likewise.
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* sysdeps/s390/multiarch/memrchr.c: Likewise.
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* sysdeps/s390/multiarch/Makefile
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(sysdep_routines): Add memrchr 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 memrchr.
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---
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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/memrchr-c.c | 25 +++++
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sysdeps/s390/multiarch/memrchr-vx.S | 160 +++++++++++++++++++++++++++++++
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sysdeps/s390/multiarch/memrchr.c | 28 ++++++
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5 files changed, 217 insertions(+), 1 deletion(-)
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create mode 100644 sysdeps/s390/multiarch/memrchr-c.c
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create mode 100644 sysdeps/s390/multiarch/memrchr-vx.S
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create mode 100644 sysdeps/s390/multiarch/memrchr.c
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diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
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index 929a545..0805b07 100644
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--- a/sysdeps/s390/multiarch/Makefile
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+++ b/sysdeps/s390/multiarch/Makefile
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@@ -17,7 +17,8 @@ sysdep_routines += strlen strlen-vx strlen-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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- memccpy memccpy-vx memccpy-c
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+ memccpy memccpy-vx memccpy-c \
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+ memrchr memrchr-vx memrchr-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 5ea258b..c235bdc 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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@@ -137,6 +137,8 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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IFUNC_VX_IMPL (wmemcmp);
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+ IFUNC_VX_IMPL (memrchr);
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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/memrchr-c.c b/sysdeps/s390/multiarch/memrchr-c.c
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new file mode 100644
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index 0000000..6a32861
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--- /dev/null
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+++ b/sysdeps/s390/multiarch/memrchr-c.c
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@@ -0,0 +1,25 @@
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+/* Default memrchr 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 MEMRCHR __memrchr_c
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+
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+# include <string.h>
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+extern __typeof (__memrchr) __memrchr_c;
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+# include <string/memrchr.c>
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+#endif
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diff --git a/sysdeps/s390/multiarch/memrchr-vx.S b/sysdeps/s390/multiarch/memrchr-vx.S
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new file mode 100644
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index 0000000..da6dbdf
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--- /dev/null
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+++ b/sysdeps/s390/multiarch/memrchr-vx.S
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@@ -0,0 +1,160 @@
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+/* Vector optimized 32/64 bit S/390 version of memrchr.
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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 *memrchr (const void *s, int c, size_t n)
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+ Scans memory for character c backwards
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+ and returns pointer to first c.
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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=s
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+ -r3=c
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+ -r4=n
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+ -r5=s in loop
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+
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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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+ -v20=permute pattern
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+*/
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+ENTRY(__memrchr_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 %r4,%r4
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+# endif /* !defined __s390x__ */
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+ clgije %r4,0,.Lnot_found
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+
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+ vlvgb %v18,%r3,0 /* 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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+
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+ llcr %r3,%r3 /* char c_char = (char) c. */
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+
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+ /* check byte n - 1. */
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+ llc %r0,-1(%r4,%r2)
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+ slgfi %r4,1
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+ clrje %r0,%r3,.Lfound_end
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+ jh .Lnot_found /* Return NULL if n is now 0. */
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+
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+ larl %r1,.Lpermute_mask /* Load permute mask. */
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+ vl %v20,0(%r1)
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+
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+ /* check byte n - 2. */
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+ llc %r0,-1(%r4,%r2)
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+ slgfi %r4,1
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+ clrje %r0,%r3,.Lfound_end
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+ jh .Lnot_found /* Return NULL if n is now 0. */
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+
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+ clgijhe %r4,64,.Lloop64 /* If n >= 64 -> loop64. */
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+
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+.Llt64:
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+ /* Process n < 64 bytes. */
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+ clgijl %r4,16,.Llt16 /* Jump away if n < 16. */
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+ aghi %r4,-16
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+ vl %v16,0(%r4,%r2)
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+ vfeebs %v17,%v16,%v18
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+ jno .Lfound0
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+ clgijl %r4,16,.Llt16
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+ aghi %r4,-16
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+ vl %v16,0(%r4,%r2)
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+ vfeebs %v17,%v16,%v18
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+ jno .Lfound0
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+ clgijl %r4,16,.Llt16
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+ aghi %r4,-16
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+ vl %v16,0(%r4,%r2)
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+ vfeebs %v17,%v16,%v18
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+ jno .Lfound0
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+.Llt16:
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+ clgfi %r4,0 /* if remaining bytes == 0, return NULL. */
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+ locghie %r2,0
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+ ber %r14
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+
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+ aghi %r4,-1 /* vll needs highest index. */
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+ vll %v16,%r4,0(%r2) /* Load remaining bytes. */
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+
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+ /* Right-shift of v16 to mask bytes after highest index. */
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+ lhi %r0,15
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+ slr %r0,%r4 /* Compute byte count for vector shift right. */
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+ sll %r0,3 /* Convert to bit count. */
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+ vlvgb %v17,%r0,7
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+ vsrlb %v16,%v16,%v17 /* Vector shift right by byte by number of bytes
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+ specified in bits 1-4 of byte 7 in v17. */
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+ j .Lfound_permute
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+
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+.Lfound48:
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+ aghi %r4,16
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+.Lfound32:
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+ aghi %r4,16
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+.Lfound16:
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+ aghi %r4,16
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+.Lfound0:
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+ la %r2,0(%r4,%r2) /* Set pointer to start of v16. */
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+ lghi %r4,15 /* Set highest index in v16 to last index. */
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+.Lfound_permute:
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+ /* Search for a c in v16 in reversed byte order. v16 contains %r4 + 1
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+ bytes. If v16 was not fully loaded, the bytes are already
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+ right shifted, so that the bytes in v16 can simply be reversed. */
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+ vperm %v16,%v16,%v16,%v20 /* Permute v16 to reversed order. */
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+ vfeeb %v16,%v16,%v18 /* Find c in reversed v16. */
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+ vlgvb %r1,%v16,7 /* Index of c or 16 if not found. */
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+
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+ /* Return NULL if there is no c in loaded bytes. */
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+ clrjh %r1,%r4,.Lnot_found
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+
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+ slgr %r4,%r1
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+.Lfound_end:
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+ la %r2,0(%r4,%r2) /* Return pointer to c. */
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+ br %r14
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+
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+.Lnot_found:
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+ lghi %r2,0
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+ br %r14
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+
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+.Lpermute_mask:
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+ .byte 0x0F,0x0E,0x0D,0x0C,0x0B,0x0A,0x09,0x08
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+ .byte 0x07,0x06,0x05,0x04,0x03,0x02,0x01,0x00
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+
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+.Lloop64:
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+ aghi %r4,-64
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+ vl %v16,48(%r4,%r2) /* Load 16bytes of memory area. */
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+ vfeebs %v17,%v16,%v18 /* Find c. */
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+ jno .Lfound48 /* Jump away if c was found. */
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+ vl %v16,32(%r4,%r2)
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+ vfeebs %v17,%v16,%v18
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+ jno .Lfound32
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+ vl %v16,16(%r4,%r2)
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+ vfeebs %v17,%v16,%v18
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+ jno .Lfound16
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+ vl %v16,0(%r4,%r2)
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+ vfeebs %v17,%v16,%v18
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+ jno .Lfound0
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+
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+ clgijhe %r4,64,.Lloop64 /* If n >= 64 -> loop64. */
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ce426f |
+ j .Llt64
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ce426f |
+END(__memrchr_vx)
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ce426f |
+#endif /* HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc */
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diff --git a/sysdeps/s390/multiarch/memrchr.c b/sysdeps/s390/multiarch/memrchr.c
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new file mode 100644
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index 0000000..6596067
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--- /dev/null
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+++ b/sysdeps/s390/multiarch/memrchr.c
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ce426f |
@@ -0,0 +1,28 @@
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ce426f |
+/* Multiple versions of memrchr.
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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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ce426f |
+ modify it under the terms of the GNU Lesser General Public
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ce426f |
+ License as published by the Free Software Foundation; either
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ce426f |
+ version 2.1 of the License, or (at your option) any later version.
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ce426f |
+
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ce426f |
+ The GNU C Library is distributed in the hope that it will be useful,
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|
ce426f |
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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|
ce426f |
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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ce426f |
+ Lesser General Public License for more details.
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ce426f |
+
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ce426f |
+ You should have received a copy of the GNU Lesser General Public
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ce426f |
+ License along with the GNU C Library; if not, see
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ce426f |
+ <http://www.gnu.org/licenses/>. */
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ce426f |
+
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ce426f |
+#if defined HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc
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ce426f |
+# include <string.h>
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ce426f |
+# include <ifunc-resolve.h>
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ce426f |
+
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ce426f |
+s390_vx_libc_ifunc (__memrchr)
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ce426f |
+weak_alias (__memrchr, memrchr)
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ce426f |
+
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+#else
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+# include <string/memrchr.c>
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+#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc) */
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ce426f |
--
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2.3.0
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ce426f |
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