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commit 6f47401bd5fc71209219779a0426170a9a7395b0
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Author: Stefan Liebler <stli@linux.ibm.com>
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Date: Fri Mar 22 11:14:08 2019 +0100
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S390: Add arch13 strstr ifunc variant.
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This patch introduces the new arch13 ifunc variant for strstr.
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For needles longer than 9 charachters it is relying on the common-code
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implementation. For shorter needles it is using the new vstrs instruction
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which is able to search a substring within a vector register.
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ChangeLog:
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* sysdeps/s390/Makefile (sysdep_routines): Add strstr-arch13.
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* sysdeps/s390/ifunc-strstr.h (HAVE_STRSTR_ARCH13, STRSTR_ARCH13,
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STRSTR_Z13_ONLY_USED_AS_FALLBACK, HAVE_STRSTR_IFUNC_AND_ARCH13_SUPPORT):
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New defines.
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* sysdeps/s390/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Add ifunc variant for arch13 strstr.
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* sysdeps/s390/strstr-arch13.S: New file.
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* sysdeps/s390/strstr-vx.c: Omit GI symbol for z13 strstr ifunc variant
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if it is only used as fallback.
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* sysdeps/s390/strstr.c (strstr): Add arch13 variant in ifunc selector.
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diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
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index 3f7de6613c343819..7287b1833da9500f 100644
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--- a/sysdeps/s390/Makefile
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+++ b/sysdeps/s390/Makefile
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@@ -35,7 +35,7 @@ sysdep_routines += bzero memset memset-z900 \
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memcmp memcmp-z900 \
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mempcpy memcpy memcpy-z900 \
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memmove memmove-c \
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- strstr strstr-vx strstr-c \
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+ strstr strstr-arch13 strstr-vx strstr-c \
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memmem memmem-vx memmem-c \
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strlen strlen-vx strlen-c \
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strnlen strnlen-vx strnlen-c \
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diff --git a/sysdeps/s390/ifunc-strstr.h b/sysdeps/s390/ifunc-strstr.h
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index e6ccfd4e44a1a790..809184d425ad06b0 100644
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--- a/sysdeps/s390/ifunc-strstr.h
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+++ b/sysdeps/s390/ifunc-strstr.h
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@@ -17,7 +17,7 @@
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<http://www.gnu.org/licenses/>. */
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#if defined USE_MULTIARCH && IS_IN (libc) \
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- && ! defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
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+ && ! defined HAVE_S390_MIN_ARCH13_ZARCH_ASM_SUPPORT
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# define HAVE_STRSTR_IFUNC 1
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#else
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# define HAVE_STRSTR_IFUNC 0
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@@ -29,14 +29,32 @@
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# define HAVE_STRSTR_IFUNC_AND_VX_SUPPORT 0
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#endif
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-#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
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+#ifdef HAVE_S390_ARCH13_ASM_SUPPORT
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+# define HAVE_STRSTR_IFUNC_AND_ARCH13_SUPPORT HAVE_STRSTR_IFUNC
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+#else
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+# define HAVE_STRSTR_IFUNC_AND_ARCH13_SUPPORT 0
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+#endif
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+
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+#if defined HAVE_S390_MIN_ARCH13_ZARCH_ASM_SUPPORT
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+# define STRSTR_DEFAULT STRSTR_ARCH13
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+# define HAVE_STRSTR_C 0
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+# define HAVE_STRSTR_Z13 1
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+# define STRSTR_Z13_ONLY_USED_AS_FALLBACK 1
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+# define HAVE_STRSTR_ARCH13 1
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+#elif defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
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# define STRSTR_DEFAULT STRSTR_Z13
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# define HAVE_STRSTR_C 0
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# define HAVE_STRSTR_Z13 1
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+# define HAVE_STRSTR_ARCH13 HAVE_STRSTR_IFUNC_AND_ARCH13_SUPPORT
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#else
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# define STRSTR_DEFAULT STRSTR_C
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# define HAVE_STRSTR_C 1
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# define HAVE_STRSTR_Z13 HAVE_STRSTR_IFUNC_AND_VX_SUPPORT
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+# define HAVE_STRSTR_ARCH13 HAVE_STRSTR_IFUNC_AND_ARCH13_SUPPORT
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+#endif
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+
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+#ifndef STRSTR_Z13_ONLY_USED_AS_FALLBACK
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+# define STRSTR_Z13_ONLY_USED_AS_FALLBACK 0
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#endif
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#if HAVE_STRSTR_C
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@@ -50,3 +68,9 @@
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#else
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# define STRSTR_Z13 NULL
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#endif
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+
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+#if HAVE_STRSTR_ARCH13
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+# define STRSTR_ARCH13 __strstr_arch13
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+#else
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+# define STRSTR_ARCH13 NULL
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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 c24bfc95f2d7a22d..67a6a9c94afccd48 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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@@ -186,6 +186,10 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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#if HAVE_STRSTR_IFUNC
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IFUNC_IMPL (i, name, strstr,
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+# if HAVE_STRSTR_ARCH13
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+ IFUNC_IMPL_ADD (array, i, strstr,
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+ dl_hwcap & HWCAP_S390_VXRS_EXT2, STRSTR_ARCH13)
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+# endif
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# if HAVE_STRSTR_Z13
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IFUNC_IMPL_ADD (array, i, strstr,
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dl_hwcap & HWCAP_S390_VX, STRSTR_Z13)
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diff --git a/sysdeps/s390/strstr-arch13.S b/sysdeps/s390/strstr-arch13.S
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new file mode 100644
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index 0000000000000000..929b026adfeba740
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--- /dev/null
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+++ b/sysdeps/s390/strstr-arch13.S
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@@ -0,0 +1,179 @@
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+/* Vector optimized 32/64 bit S/390 version of strstr.
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+ Copyright (C) 2019 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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+#include <ifunc-strstr.h>
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+#if HAVE_STRSTR_ARCH13
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+# include "sysdep.h"
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+# include "asm-syntax.h"
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+ .text
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+
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+/* char *strstr (const char *haystack=r2, const char *needle=r3)
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+ Locate a substring. */
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+ENTRY(STRSTR_ARCH13)
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+ .machine "arch13"
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+ .machinemode "zarch_nohighgprs"
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+ lcbb %r1,0(%r3),6
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+ jo .Lneedle_on_bb /* Needle on block-boundary? */
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+ vl %v18,0(%r3),6 /* Load needle. */
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+ vfenezb %v19,%v18,%v18 /* v19[7] contains the length of needle. */
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+.Lneedle_loaded:
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+ vlgvb %r4,%v19,7 /* Get index of zero or 16 if not found. */
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+ lghi %r5,17 /* See below: min-skip-partial-match-index. */
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+ cgibe %r4,0,0(%r14) /* Test if needle is zero and return. */
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+
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+ /* The vstrs instruction is able to handle needles up to a length of 16,
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+ but then we may have to load the next part of haystack with a
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+ small offset. This will be slow - see examples:
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+ haystack =mmmmmmmmmmmmmmmm mmmmmmmmmmmmmmmmmm...mmmmmmmmmmmmmmmmmmma
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+ needle = mmmmmmmmmmmmmma0
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+ => needle_len=15; vstrs reports a partial match; haystack+=2
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+ haystack =mmmmmmmmmmmmmmmm mmmmmmmmmmmmmmmmmm...mmmmmmmmmmmmmmmmmmma
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+ needle = mmmmmmmma0000000
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+ => needle_len=9; vstrs reports a partial match; haystack+=8 */
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+# if ! HAVE_STRSTR_Z13
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+# error The arch13 variant of strstr needs the z13 variant of strstr!
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+# endif
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+ clgfi %r4,9
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+ jh STRSTR_Z13
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+
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+ /* In case of a partial match, the vstrs instruction returns the index
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+ of the partial match in a vector-register. Then we have to
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+ reload the string at the "current-position plus this index" and run
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+ vstrs again in order to determine if it was a full match or no match.
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+ Transferring this index from vr to gr, compute the haystack-address
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+ and loading with vl is quite slow as all instructions have data
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+ dependencies. Thus we assume, that a partial match is always at the
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+ first possible index and just load the next part of haystack from
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+ there instead of waiting until the correct index is computed:
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+ min-skip-partial-match-index = (16 - n_len) + 1 */
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+ sgr %r5,%r4
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+
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+.Lloop:
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+ lcbb %r1,0(%r2),6
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+ jo .Lloop_haystack_on_bb /* Haystack on block-boundary? */
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+ vl %v16,0(%r2) /* Load next part of haystack. */
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+.Lloop_haystack_loaded:
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+ /* Vector string search with zero search (cc=0 => no match). */
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+ vstrs %v20,%v16,%v18,%v19,0,2
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+ jne .Lloop_vstrs_nonzero_cc
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+ lcbb %r1,16(%r2),6 /* Next part of haystack. */
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+ jo .Lloop_haystack_on_bb16
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+ vl %v16,16(%r2)
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+ vstrs %v20,%v16,%v18,%v19,0,2
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+ jne .Lloop_vstrs_nonzero_cc16
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+ lcbb %r1,32(%r2),6 /* Next part of haystack. */
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+ jo .Lloop_haystack_on_bb32
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+ vl %v16,32(%r2)
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+ vstrs %v20,%v16,%v18,%v19,0,2
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+ jne .Lloop_vstrs_nonzero_cc32
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+ lcbb %r1,48(%r2),6 /* Next part of haystack. */
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+ jo .Lloop_haystack_on_bb48
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+ vl %v16,48(%r2)
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+ vstrs %v20,%v16,%v18,%v19,0,2
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+ jne .Lloop_vstrs_nonzero_cc48
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+ la %r2,64(%r2)
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+ j .Lloop
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+
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+.Lloop_vstrs_nonzero_cc48:
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+ la %r2,16(%r2)
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+.Lloop_vstrs_nonzero_cc32:
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+ la %r2,16(%r2)
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+.Lloop_vstrs_nonzero_cc16:
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+ la %r2,16(%r2)
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+.Lloop_vstrs_nonzero_cc:
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+ jh .Lend_match_found /* cc == 2 (full match) */
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+ jl .Lend_no_match /* cc == 1 (no match, end of string) */
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+ /* cc == 3 (partial match) See above: min-skip-partial-match-index! */
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+ lcbb %r1,0(%r5,%r2),6
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+ la %r2,0(%r5,%r2)
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+ jo .Lloop_haystack_on_bb
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+ vl %v16,0(%r2)
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+ vstrs %v20,%v16,%v18,%v19,0,2
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+.Lloop_vstrs_nonzero_cc_loop:
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+ jh .Lend_match_found
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+ jl .Lend_no_match
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+ la %r2,0(%r5,%r2)
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+ je .Lloop
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+ lcbb %r1,0(%r2),6 /* Next part of haystack. */
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+ jo .Lloop_haystack_on_bb
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+ vl %v16,0(%r2)
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+ vstrs %v20,%v16,%v18,%v19,0,2
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+ jh .Lend_match_found
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+ jl .Lend_no_match
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+ la %r2,0(%r5,%r2)
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+ je .Lloop
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+ lcbb %r1,0(%r2),6 /* Next part of haystack. */
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+ jo .Lloop_haystack_on_bb
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+ vl %v16,0(%r2)
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+ vstrs %v20,%v16,%v18,%v19,0,2
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+ jh .Lend_match_found
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+ jl .Lend_no_match
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+ la %r2,0(%r5,%r2)
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+ je .Lloop
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+ lcbb %r1,0(%r2),6 /* Next part of haystack. */
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+ jo .Lloop_haystack_on_bb
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+ vl %v16,0(%r2)
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+ vstrs %v20,%v16,%v18,%v19,0,2
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+ j .Lloop_vstrs_nonzero_cc_loop
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+
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+.Lend_no_match:
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+ lghi %r2,0
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+ br %r14
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+.Lend_match_found:
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+ vlgvb %r4,%v20,7
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+ la %r2,0(%r4,%r2)
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+ br %r14
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+
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+.Lloop_haystack_on_bb48:
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+ la %r2,16(%r2)
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+.Lloop_haystack_on_bb32:
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+ la %r2,16(%r2)
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+.Lloop_haystack_on_bb16:
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+ la %r2,16(%r2)
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077c9d |
+.Lloop_haystack_on_bb:
|
|
|
077c9d |
+ /* Haystack located on page-boundary. */
|
|
|
077c9d |
+ ahi %r1,-1 /* vll needs highest index instead of count. */
|
|
|
077c9d |
+ vll %v16,%r1,0(%r2)
|
|
|
077c9d |
+ vlvgb %v21,%r1,7
|
|
|
077c9d |
+ vfenezb %v17,%v16,%v16 /* Search zero in loaded haystack bytes. */
|
|
|
077c9d |
+ veclb %v17,%v21 /* Zero index <= loaded byte index? */
|
|
|
077c9d |
+ jle .Lloop_haystack_loaded /* -> v16 contains full haystack. */
|
|
|
077c9d |
+ vl %v16,0(%r2) /* Load haystack beyond page boundary. */
|
|
|
077c9d |
+ j .Lloop_haystack_loaded
|
|
|
077c9d |
+
|
|
|
077c9d |
+.Lneedle_on_bb:
|
|
|
077c9d |
+ /* Needle located on page-boundary. */
|
|
|
077c9d |
+ ahi %r1,-1 /* vll needs highest index instead of count. */
|
|
|
077c9d |
+ vll %v18,%r1,0(%r3)
|
|
|
077c9d |
+ vlvgb %v21,%r1,7
|
|
|
077c9d |
+ vfenezb %v19,%v18,%v18 /* Search zero in loaded needle bytes. */
|
|
|
077c9d |
+ veclb %v19,%v21 /* Zero index <= max loaded byte index? */
|
|
|
077c9d |
+ jle .Lneedle_loaded /* -> v18 contains full needle. */
|
|
|
077c9d |
+ vl %v16,0(%r3) /* Load needle beyond page boundary. */
|
|
|
077c9d |
+ vfenezb %v19,%v18,%v18
|
|
|
077c9d |
+ j .Lneedle_loaded
|
|
|
077c9d |
+END(STRSTR_ARCH13)
|
|
|
077c9d |
+
|
|
|
077c9d |
+# if ! HAVE_STRSTR_IFUNC
|
|
|
077c9d |
+strong_alias (STRSTR_ARCH13, strstr)
|
|
|
077c9d |
+# endif
|
|
|
077c9d |
+
|
|
|
077c9d |
+# if STRSTR_Z13_ONLY_USED_AS_FALLBACK && defined SHARED && IS_IN (libc)
|
|
|
077c9d |
+strong_alias (STRSTR_ARCH13, __GI_strstr)
|
|
|
077c9d |
+# endif
|
|
|
077c9d |
+#endif
|
|
|
077c9d |
diff --git a/sysdeps/s390/strstr-vx.c b/sysdeps/s390/strstr-vx.c
|
|
|
077c9d |
index effae9d5eb7d2fb1..f69159ffc198b10b 100644
|
|
|
077c9d |
--- a/sysdeps/s390/strstr-vx.c
|
|
|
077c9d |
+++ b/sysdeps/s390/strstr-vx.c
|
|
|
077c9d |
@@ -19,11 +19,11 @@
|
|
|
077c9d |
#include <ifunc-strstr.h>
|
|
|
077c9d |
|
|
|
077c9d |
#if HAVE_STRSTR_Z13
|
|
|
077c9d |
-# if HAVE_STRSTR_IFUNC
|
|
|
077c9d |
+# if HAVE_STRSTR_IFUNC || STRSTR_Z13_ONLY_USED_AS_FALLBACK
|
|
|
077c9d |
# define STRSTR STRSTR_Z13
|
|
|
077c9d |
# if defined SHARED && IS_IN (libc)
|
|
|
077c9d |
# undef libc_hidden_builtin_def
|
|
|
077c9d |
-# if HAVE_STRSTR_C
|
|
|
077c9d |
+# if HAVE_STRSTR_C || STRSTR_Z13_ONLY_USED_AS_FALLBACK
|
|
|
077c9d |
# define libc_hidden_builtin_def(name)
|
|
|
077c9d |
# else
|
|
|
077c9d |
# define libc_hidden_builtin_def(name) \
|
|
|
077c9d |
diff --git a/sysdeps/s390/strstr.c b/sysdeps/s390/strstr.c
|
|
|
077c9d |
index f8432349a7254cc6..d2969fd0a68fadbf 100644
|
|
|
077c9d |
--- a/sysdeps/s390/strstr.c
|
|
|
077c9d |
+++ b/sysdeps/s390/strstr.c
|
|
|
077c9d |
@@ -32,8 +32,14 @@ extern __typeof (__redirect_strstr) STRSTR_C attribute_hidden;
|
|
|
077c9d |
extern __typeof (__redirect_strstr) STRSTR_Z13 attribute_hidden;
|
|
|
077c9d |
# endif
|
|
|
077c9d |
|
|
|
077c9d |
+# if HAVE_STRSTR_ARCH13
|
|
|
077c9d |
+extern __typeof (__redirect_strstr) STRSTR_ARCH13 attribute_hidden;
|
|
|
077c9d |
+# endif
|
|
|
077c9d |
+
|
|
|
077c9d |
s390_libc_ifunc_expr (__redirect_strstr, strstr,
|
|
|
077c9d |
- (HAVE_STRSTR_Z13 && (hwcap & HWCAP_S390_VX))
|
|
|
077c9d |
+ (HAVE_STRSTR_ARCH13 && (hwcap & HWCAP_S390_VXRS_EXT2))
|
|
|
077c9d |
+ ? STRSTR_ARCH13
|
|
|
077c9d |
+ : (HAVE_STRSTR_Z13 && (hwcap & HWCAP_S390_VX))
|
|
|
077c9d |
? STRSTR_Z13
|
|
|
077c9d |
: STRSTR_DEFAULT
|
|
|
077c9d |
)
|