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glibc.22972
0016-S390-Add-arch13-strstr-ifunc-variant.patch
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File 0016-S390-Add-arch13-strstr-ifunc-variant.patch of Package glibc.22972
From d65ead17a0c11fc369225eb24ebf8c9a7132b2e8 Mon Sep 17 00:00:00 2001 From: Stefan Liebler <stli@linux.ibm.com> Date: Fri, 22 Mar 2019 11:14:08 +0100 Subject: [PATCH 16/18] S390: Add arch13 strstr ifunc variant. This patch introduces the new arch13 ifunc variant for strstr. For needles longer than 9 charachters it is relying on the common-code implementation. For shorter needles it is using the new vstrs instruction which is able to search a substring within a vector register. ChangeLog: * sysdeps/s390/Makefile (sysdep_routines): Add strstr-arch13. * sysdeps/s390/ifunc-strstr.h (HAVE_STRSTR_ARCH13, STRSTR_ARCH13, STRSTR_Z13_ONLY_USED_AS_FALLBACK, HAVE_STRSTR_IFUNC_AND_ARCH13_SUPPORT): New defines. * sysdeps/s390/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list): Add ifunc variant for arch13 strstr. * sysdeps/s390/strstr-arch13.S: New file. * sysdeps/s390/strstr-vx.c: Omit GI symbol for z13 strstr ifunc variant if it is only used as fallback. * sysdeps/s390/strstr.c (strstr): Add arch13 variant in ifunc selector. (cherry picked from commit 6f47401bd5fc71209219779a0426170a9a7395b0) --- sysdeps/s390/Makefile | 2 +- sysdeps/s390/ifunc-strstr.h | 28 ++++- sysdeps/s390/multiarch/ifunc-impl-list.c | 4 + sysdeps/s390/strstr-arch13.S | 179 +++++++++++++++++++++++++++++++ sysdeps/s390/strstr-vx.c | 4 +- sysdeps/s390/strstr.c | 8 +- 6 files changed, 219 insertions(+), 6 deletions(-) create mode 100644 sysdeps/s390/strstr-arch13.S Index: glibc-2.26/sysdeps/s390/Makefile =================================================================== --- glibc-2.26.orig/sysdeps/s390/Makefile +++ glibc-2.26/sysdeps/s390/Makefile @@ -33,6 +33,6 @@ endif ifeq ($(subdir),string) sysdep_routines += mempcpy memcpy memcpy-z900 \ memmove memmove-c \ - strstr strstr-vx strstr-c \ + strstr strstr-arch13 strstr-vx strstr-c \ memmem memmem-vx memmem-c endif Index: glibc-2.26/sysdeps/s390/ifunc-strstr.h =================================================================== --- glibc-2.26.orig/sysdeps/s390/ifunc-strstr.h +++ glibc-2.26/sysdeps/s390/ifunc-strstr.h @@ -17,7 +17,7 @@ <http://www.gnu.org/licenses/>. */ #if defined USE_MULTIARCH && IS_IN (libc) \ - && ! defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT + && ! defined HAVE_S390_MIN_ARCH13_ZARCH_ASM_SUPPORT # define HAVE_STRSTR_IFUNC 1 #else # define HAVE_STRSTR_IFUNC 0 @@ -29,14 +29,32 @@ # define HAVE_STRSTR_IFUNC_AND_VX_SUPPORT 0 #endif -#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT +#ifdef HAVE_S390_ARCH13_ASM_SUPPORT +# define HAVE_STRSTR_IFUNC_AND_ARCH13_SUPPORT HAVE_STRSTR_IFUNC +#else +# define HAVE_STRSTR_IFUNC_AND_ARCH13_SUPPORT 0 +#endif + +#if defined HAVE_S390_MIN_ARCH13_ZARCH_ASM_SUPPORT +# define STRSTR_DEFAULT STRSTR_ARCH13 +# define HAVE_STRSTR_C 0 +# define HAVE_STRSTR_Z13 1 +# define STRSTR_Z13_ONLY_USED_AS_FALLBACK 1 +# define HAVE_STRSTR_ARCH13 1 +#elif defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT # define STRSTR_DEFAULT STRSTR_Z13 # define HAVE_STRSTR_C 0 # define HAVE_STRSTR_Z13 1 +# define HAVE_STRSTR_ARCH13 HAVE_STRSTR_IFUNC_AND_ARCH13_SUPPORT #else # define STRSTR_DEFAULT STRSTR_C # define HAVE_STRSTR_C 1 # define HAVE_STRSTR_Z13 HAVE_STRSTR_IFUNC_AND_VX_SUPPORT +# define HAVE_STRSTR_ARCH13 HAVE_STRSTR_IFUNC_AND_ARCH13_SUPPORT +#endif + +#ifndef STRSTR_Z13_ONLY_USED_AS_FALLBACK +# define STRSTR_Z13_ONLY_USED_AS_FALLBACK 0 #endif #if HAVE_STRSTR_C @@ -50,3 +68,9 @@ #else # define STRSTR_Z13 NULL #endif + +#if HAVE_STRSTR_ARCH13 +# define STRSTR_ARCH13 __strstr_arch13 +#else +# define STRSTR_ARCH13 NULL +#endif Index: glibc-2.26/sysdeps/s390/multiarch/ifunc-impl-list.c =================================================================== --- glibc-2.26.orig/sysdeps/s390/multiarch/ifunc-impl-list.c +++ glibc-2.26/sysdeps/s390/multiarch/ifunc-impl-list.c @@ -112,6 +112,10 @@ __libc_ifunc_impl_list (const char *name #if HAVE_STRSTR_IFUNC IFUNC_IMPL (i, name, strstr, +# if HAVE_STRSTR_ARCH13 + IFUNC_IMPL_ADD (array, i, strstr, + dl_hwcap & HWCAP_S390_VXRS_EXT2, STRSTR_ARCH13) +# endif # if HAVE_STRSTR_Z13 IFUNC_IMPL_ADD (array, i, strstr, dl_hwcap & HWCAP_S390_VX, STRSTR_Z13) Index: glibc-2.26/sysdeps/s390/strstr-arch13.S =================================================================== --- /dev/null +++ glibc-2.26/sysdeps/s390/strstr-arch13.S @@ -0,0 +1,179 @@ +/* Vector optimized 32/64 bit S/390 version of strstr. + Copyright (C) 2019 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/>. */ + +#include <ifunc-strstr.h> +#if HAVE_STRSTR_ARCH13 +# include "sysdep.h" +# include "asm-syntax.h" + .text + +/* char *strstr (const char *haystack=r2, const char *needle=r3) + Locate a substring. */ +ENTRY(STRSTR_ARCH13) + .machine "arch13" + .machinemode "zarch_nohighgprs" + lcbb %r1,0(%r3),6 + jo .Lneedle_on_bb /* Needle on block-boundary? */ + vl %v18,0(%r3),6 /* Load needle. */ + vfenezb %v19,%v18,%v18 /* v19[7] contains the length of needle. */ +.Lneedle_loaded: + vlgvb %r4,%v19,7 /* Get index of zero or 16 if not found. */ + lghi %r5,17 /* See below: min-skip-partial-match-index. */ + cgibe %r4,0,0(%r14) /* Test if needle is zero and return. */ + + /* The vstrs instruction is able to handle needles up to a length of 16, + but then we may have to load the next part of haystack with a + small offset. This will be slow - see examples: + haystack =mmmmmmmmmmmmmmmm mmmmmmmmmmmmmmmmmm...mmmmmmmmmmmmmmmmmmma + needle = mmmmmmmmmmmmmma0 + => needle_len=15; vstrs reports a partial match; haystack+=2 + haystack =mmmmmmmmmmmmmmmm mmmmmmmmmmmmmmmmmm...mmmmmmmmmmmmmmmmmmma + needle = mmmmmmmma0000000 + => needle_len=9; vstrs reports a partial match; haystack+=8 */ +# if ! HAVE_STRSTR_Z13 +# error The arch13 variant of strstr needs the z13 variant of strstr! +# endif + clgfi %r4,9 + jh STRSTR_Z13 + + /* In case of a partial match, the vstrs instruction returns the index + of the partial match in a vector-register. Then we have to + reload the string at the "current-position plus this index" and run + vstrs again in order to determine if it was a full match or no match. + Transferring this index from vr to gr, compute the haystack-address + and loading with vl is quite slow as all instructions have data + dependencies. Thus we assume, that a partial match is always at the + first possible index and just load the next part of haystack from + there instead of waiting until the correct index is computed: + min-skip-partial-match-index = (16 - n_len) + 1 */ + sgr %r5,%r4 + +.Lloop: + lcbb %r1,0(%r2),6 + jo .Lloop_haystack_on_bb /* Haystack on block-boundary? */ + vl %v16,0(%r2) /* Load next part of haystack. */ +.Lloop_haystack_loaded: + /* Vector string search with zero search (cc=0 => no match). */ + vstrs %v20,%v16,%v18,%v19,0,2 + jne .Lloop_vstrs_nonzero_cc + lcbb %r1,16(%r2),6 /* Next part of haystack. */ + jo .Lloop_haystack_on_bb16 + vl %v16,16(%r2) + vstrs %v20,%v16,%v18,%v19,0,2 + jne .Lloop_vstrs_nonzero_cc16 + lcbb %r1,32(%r2),6 /* Next part of haystack. */ + jo .Lloop_haystack_on_bb32 + vl %v16,32(%r2) + vstrs %v20,%v16,%v18,%v19,0,2 + jne .Lloop_vstrs_nonzero_cc32 + lcbb %r1,48(%r2),6 /* Next part of haystack. */ + jo .Lloop_haystack_on_bb48 + vl %v16,48(%r2) + vstrs %v20,%v16,%v18,%v19,0,2 + jne .Lloop_vstrs_nonzero_cc48 + la %r2,64(%r2) + j .Lloop + +.Lloop_vstrs_nonzero_cc48: + la %r2,16(%r2) +.Lloop_vstrs_nonzero_cc32: + la %r2,16(%r2) +.Lloop_vstrs_nonzero_cc16: + la %r2,16(%r2) +.Lloop_vstrs_nonzero_cc: + jh .Lend_match_found /* cc == 2 (full match) */ + jl .Lend_no_match /* cc == 1 (no match, end of string) */ + /* cc == 3 (partial match) See above: min-skip-partial-match-index! */ + lcbb %r1,0(%r5,%r2),6 + la %r2,0(%r5,%r2) + jo .Lloop_haystack_on_bb + vl %v16,0(%r2) + vstrs %v20,%v16,%v18,%v19,0,2 +.Lloop_vstrs_nonzero_cc_loop: + jh .Lend_match_found + jl .Lend_no_match + la %r2,0(%r5,%r2) + je .Lloop + lcbb %r1,0(%r2),6 /* Next part of haystack. */ + jo .Lloop_haystack_on_bb + vl %v16,0(%r2) + vstrs %v20,%v16,%v18,%v19,0,2 + jh .Lend_match_found + jl .Lend_no_match + la %r2,0(%r5,%r2) + je .Lloop + lcbb %r1,0(%r2),6 /* Next part of haystack. */ + jo .Lloop_haystack_on_bb + vl %v16,0(%r2) + vstrs %v20,%v16,%v18,%v19,0,2 + jh .Lend_match_found + jl .Lend_no_match + la %r2,0(%r5,%r2) + je .Lloop + lcbb %r1,0(%r2),6 /* Next part of haystack. */ + jo .Lloop_haystack_on_bb + vl %v16,0(%r2) + vstrs %v20,%v16,%v18,%v19,0,2 + j .Lloop_vstrs_nonzero_cc_loop + +.Lend_no_match: + lghi %r2,0 + br %r14 +.Lend_match_found: + vlgvb %r4,%v20,7 + la %r2,0(%r4,%r2) + br %r14 + +.Lloop_haystack_on_bb48: + la %r2,16(%r2) +.Lloop_haystack_on_bb32: + la %r2,16(%r2) +.Lloop_haystack_on_bb16: + la %r2,16(%r2) +.Lloop_haystack_on_bb: + /* Haystack located on page-boundary. */ + ahi %r1,-1 /* vll needs highest index instead of count. */ + vll %v16,%r1,0(%r2) + vlvgb %v21,%r1,7 + vfenezb %v17,%v16,%v16 /* Search zero in loaded haystack bytes. */ + veclb %v17,%v21 /* Zero index <= loaded byte index? */ + jle .Lloop_haystack_loaded /* -> v16 contains full haystack. */ + vl %v16,0(%r2) /* Load haystack beyond page boundary. */ + j .Lloop_haystack_loaded + +.Lneedle_on_bb: + /* Needle located on page-boundary. */ + ahi %r1,-1 /* vll needs highest index instead of count. */ + vll %v18,%r1,0(%r3) + vlvgb %v21,%r1,7 + vfenezb %v19,%v18,%v18 /* Search zero in loaded needle bytes. */ + veclb %v19,%v21 /* Zero index <= max loaded byte index? */ + jle .Lneedle_loaded /* -> v18 contains full needle. */ + vl %v16,0(%r3) /* Load needle beyond page boundary. */ + vfenezb %v19,%v18,%v18 + j .Lneedle_loaded +END(STRSTR_ARCH13) + +# if ! HAVE_STRSTR_IFUNC +strong_alias (STRSTR_ARCH13, strstr) +# endif + +# if STRSTR_Z13_ONLY_USED_AS_FALLBACK && defined SHARED && IS_IN (libc) +strong_alias (STRSTR_ARCH13, __GI_strstr) +# endif +#endif Index: glibc-2.26/sysdeps/s390/strstr-vx.c =================================================================== --- glibc-2.26.orig/sysdeps/s390/strstr-vx.c +++ glibc-2.26/sysdeps/s390/strstr-vx.c @@ -19,11 +19,11 @@ #include <ifunc-strstr.h> #if HAVE_STRSTR_Z13 -# if HAVE_STRSTR_IFUNC +# if HAVE_STRSTR_IFUNC || STRSTR_Z13_ONLY_USED_AS_FALLBACK # define STRSTR STRSTR_Z13 # if defined SHARED && IS_IN (libc) # undef libc_hidden_builtin_def -# if HAVE_STRSTR_C +# if HAVE_STRSTR_C || STRSTR_Z13_ONLY_USED_AS_FALLBACK # define libc_hidden_builtin_def(name) # else # define libc_hidden_builtin_def(name) \ Index: glibc-2.26/sysdeps/s390/strstr.c =================================================================== --- glibc-2.26.orig/sysdeps/s390/strstr.c +++ glibc-2.26/sysdeps/s390/strstr.c @@ -32,8 +32,14 @@ extern __typeof (__redirect_strstr) STRS extern __typeof (__redirect_strstr) STRSTR_Z13 attribute_hidden; # endif +# if HAVE_STRSTR_ARCH13 +extern __typeof (__redirect_strstr) STRSTR_ARCH13 attribute_hidden; +# endif + s390_libc_ifunc_expr (__redirect_strstr, strstr, - (HAVE_STRSTR_Z13 && (hwcap & HWCAP_S390_VX)) + (HAVE_STRSTR_ARCH13 && (hwcap & HWCAP_S390_VXRS_EXT2)) + ? STRSTR_ARCH13 + : (HAVE_STRSTR_Z13 && (hwcap & HWCAP_S390_VX)) ? STRSTR_Z13 : STRSTR_DEFAULT )
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