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glibc
0017-S390-Add-arch13-memmem-ifunc-variant.patch
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File 0017-S390-Add-arch13-memmem-ifunc-variant.patch of Package glibc
From 660b29adcbbc9f1d58ee0e6e342e259bea7273d6 Mon Sep 17 00:00:00 2001 From: Stefan Liebler <stli@linux.ibm.com> Date: Fri, 22 Mar 2019 11:14:09 +0100 Subject: [PATCH 17/18] S390: Add arch13 memmem ifunc variant. This patch introduces the new arch13 ifunc variant for memmem. For needles longer than 9 bytes 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 memmem-arch13. * sysdeps/s390/ifunc-memmem.h (HAVE_MEMMEM_ARCH13, MEMMEM_ARCH13, MEMMEM_Z13_ONLY_USED_AS_FALLBACK, HAVE_MEMMEM_IFUNC_AND_ARCH13_SUPPORT): New defines. * sysdeps/s390/memmem-arch13.S: New file. * sysdeps/s390/memmem-vx.c: Omit GI symbol for z13 memmem ifunc variant if it is only used as fallback. * sysdeps/s390/memmem.c (memmem): Add arch13 variant in ifunc selector. * sysdeps/s390/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list): Add ifunc variant for arch13 memmem. (cherry picked from commit 421749d693c4147017bc55f5ac3227c3a6e4bf31) --- sysdeps/s390/Makefile | 2 +- sysdeps/s390/ifunc-memmem.h | 28 +++++- sysdeps/s390/memmem-arch13.S | 161 +++++++++++++++++++++++++++++++ sysdeps/s390/memmem-vx.c | 4 +- sysdeps/s390/memmem.c | 8 +- sysdeps/s390/multiarch/ifunc-impl-list.c | 4 + 6 files changed, 201 insertions(+), 6 deletions(-) create mode 100644 sysdeps/s390/memmem-arch13.S Index: glibc-2.26/sysdeps/s390/Makefile =================================================================== --- glibc-2.26.orig/sysdeps/s390/Makefile +++ glibc-2.26/sysdeps/s390/Makefile @@ -34,5 +34,5 @@ ifeq ($(subdir),string) sysdep_routines += mempcpy memcpy memcpy-z900 \ memmove memmove-c \ strstr strstr-arch13 strstr-vx strstr-c \ - memmem memmem-vx memmem-c + memmem memmem-arch13 memmem-vx memmem-c endif Index: glibc-2.26/sysdeps/s390/ifunc-memmem.h =================================================================== --- glibc-2.26.orig/sysdeps/s390/ifunc-memmem.h +++ glibc-2.26/sysdeps/s390/ifunc-memmem.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_MEMMEM_IFUNC 1 #else # define HAVE_MEMMEM_IFUNC 0 @@ -29,14 +29,32 @@ # define HAVE_MEMMEM_IFUNC_AND_VX_SUPPORT 0 #endif -#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT +#ifdef HAVE_S390_ARCH13_ASM_SUPPORT +# define HAVE_MEMMEM_IFUNC_AND_ARCH13_SUPPORT HAVE_MEMMEM_IFUNC +#else +# define HAVE_MEMMEM_IFUNC_AND_ARCH13_SUPPORT 0 +#endif + +#if defined HAVE_S390_MIN_ARCH13_ZARCH_ASM_SUPPORT +# define MEMMEM_DEFAULT MEMMEM_ARCH13 +# define HAVE_MEMMEM_C 0 +# define HAVE_MEMMEM_Z13 1 +# define MEMMEM_Z13_ONLY_USED_AS_FALLBACK 1 +# define HAVE_MEMMEM_ARCH13 1 +#elif defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT # define MEMMEM_DEFAULT MEMMEM_Z13 # define HAVE_MEMMEM_C 0 # define HAVE_MEMMEM_Z13 1 +# define HAVE_MEMMEM_ARCH13 HAVE_MEMMEM_IFUNC_AND_ARCH13_SUPPORT #else # define MEMMEM_DEFAULT MEMMEM_C # define HAVE_MEMMEM_C 1 # define HAVE_MEMMEM_Z13 HAVE_MEMMEM_IFUNC_AND_VX_SUPPORT +# define HAVE_MEMMEM_ARCH13 HAVE_MEMMEM_IFUNC_AND_ARCH13_SUPPORT +#endif + +#ifndef MEMMEM_Z13_ONLY_USED_AS_FALLBACK +# define MEMMEM_Z13_ONLY_USED_AS_FALLBACK 0 #endif #if HAVE_MEMMEM_C @@ -50,3 +68,9 @@ #else # define MEMMEM_Z13 NULL #endif + +#if HAVE_MEMMEM_ARCH13 +# define MEMMEM_ARCH13 __memmem_arch13 +#else +# define MEMMEM_ARCH13 NULL +#endif Index: glibc-2.26/sysdeps/s390/memmem-arch13.S =================================================================== --- /dev/null +++ glibc-2.26/sysdeps/s390/memmem-arch13.S @@ -0,0 +1,161 @@ +/* Vector optimized 32/64 bit S/390 version of memmem. + 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-memmem.h> +#if HAVE_MEMMEM_ARCH13 +# include "sysdep.h" +# include "asm-syntax.h" + .text + +/* void *memmem(const void *haystack=r2, size_t haystacklen=r3, + const void *needle=r4, size_t needlelen=r5); + Locate a substring. */ +ENTRY(MEMMEM_ARCH13) + .machine "arch13" + .machinemode "zarch_nohighgprs" +# if ! defined __s390x__ + llgfr %r3,%r3 + llgfr %r5,%r5 + llgfr %r4,%r4 + llgfr %r2,%r2 +# endif /* ! defined __s390x__ */ + clgrjl %r3,%r5,.Lend_no_match /* Haystack < needle? */ + + /* Jump to fallback if needle > 9. See also strstr-arch13.S. */ +# if ! HAVE_MEMMEM_Z13 +# error The arch13 variant of memmem needs the z13 variant of memmem! +# endif + clgfi %r5,9 + jh MEMMEM_Z13 + + aghik %r0,%r5,-1 /* vll needs highest index. */ + bc 4,0(%r14) /* cc==1: return if needle-len == 0. */ + vll %v18,%r0,0(%r4) /* Load needle. */ + vlvgb %v19,%r5,7 /* v19[7] contains length of needle. */ + + clgijh %r3,16,.Lhaystack_larger_16 +.Lhaystack_smaller_16_on_bb: + aghik %r0,%r3,-1 /* vll needs highest index. */ + vll %v16,%r0,0(%r2) /* Load haystack. */ +.Lhaystack_smaller_16: + sgr %r3,%r5 /* r3 = largest valid match-index. */ + jl .Lend_no_match /* Haystack-len < needle-len? */ + vstrs %v20,%v16,%v18,%v19,0,0 + /* Vector string search without zero search where v20 will contain + the index of a partial/full match or 16 (index is named k). + cc=0 (no match; k=16): .Lend_no_match + cc=1 (only available with zero-search): Ignore + cc=2 (full match; k<16): Needle found, but could be beyond haystack! + cc=3 (partial match; k<16): Always at end of v16 and thus beyond! */ + brc 9,.Lend_no_match /* Jump away if cc == 0 || cc == 3. */ + vlgvb %r1,%v20,7 + /* Verify that the full-match (cc=2) is valid! */ + clgrjh %r1,%r3,.Lend_no_match /* Jump away if match is beyond. */ + la %r2,0(%r1,%r2) + br %r14 +.Lend_no_match: + lghi %r2,0 + br %r14 + +.Lhaystack_larger_16: + vl %v16,0(%r2) + lghi %r1,17 + lay %r4,-16(%r3,%r2) /* Boundary for loading with vl. */ + lay %r0,-64(%r3,%r2) /* Boundary for loading with 4xvl. */ + /* See also strstr-arch13.S: + min-skip-partial-match-index = (16 - n_len) + 1 */ + sgr %r1,%r5 + clgfi %r3,64 /* Set Boundary to zero ... */ + la %r3,0(%r3,%r2) + locghil %r0,0 /* ... if haystack < 64bytes. */ + jh .Lloop64 +.Lloop: + la %r2,16(%r2) + /* Vector string search with zero search. cc=0 => no match. */ + vstrs %v20,%v16,%v18,%v19,0,0 + jne .Lloop_vstrs_nonzero_cc + clgrjh %r2,%r4,.Lhaystack_too_small +.Lloop16: + vl %v16,0(%r2) + la %r2,16(%r2) + vstrs %v20,%v16,%v18,%v19,0,0 + jne .Lloop_vstrs_nonzero_cc + clgrjle %r2,%r4,.Lloop16 +.Lhaystack_too_small: + sgr %r3,%r2 /* r3 = (haystack + len) - curr_pos */ + je .Lend_no_match /* Remaining haystack is empty. */ + lcbb %r0,0(%r2),6 + jo .Lhaystack_smaller_16_on_bb + vl %v16,0(%r2) /* Load haystack. */ + j .Lhaystack_smaller_16 + +.Lend_match_found: + vlgvb %r4,%v20,7 + sgr %r2,%r1 + la %r2,0(%r4,%r2) + br %r14 + +.Lloop_vstrs_nonzero_cc32: + la %r2,16(%r2) +.Lloop_vstrs_nonzero_cc16: + la %r2,16(%r2) +.Lloop_vstrs_nonzero_cc0: + la %r2,16(%r2) +.Lloop_vstrs_nonzero_cc: + lay %r2,-16(%r1,%r2) /* Compute next load address. */ + jh .Lend_match_found /* cc == 2 (full match) */ + clgrjh %r2,%r4,.Lhaystack_too_small + vl %v16,0(%r2) +.Lloop_vstrs_nonzero_cc_loop: + la %r2,0(%r1,%r2) + vstrs %v20,%v16,%v18,%v19,0,0 + jh .Lend_match_found + clgrjh %r2,%r4,.Lhaystack_too_small + vl %v16,0(%r2) /* Next part of haystack. */ + jo .Lloop_vstrs_nonzero_cc_loop + /* Case: no-match. */ + clgrjh %r2,%r0,.Lloop /* Jump away if haystack has less than 64b. */ +.Lloop64: + vstrs %v20,%v16,%v18,%v19,0,0 + jne .Lloop_vstrs_nonzero_cc0 + vl %v16,16(%r2) /* Next part of haystack. */ + vstrs %v20,%v16,%v18,%v19,0,0 + jne .Lloop_vstrs_nonzero_cc16 + vl %v16,32(%r2) /* Next part of haystack. */ + vstrs %v20,%v16,%v18,%v19,0,0 + jne .Lloop_vstrs_nonzero_cc32 + vl %v16,48(%r2) /* Next part of haystack. */ + la %r2,64(%r2) + vstrs %v20,%v16,%v18,%v19,0,0 + jne .Lloop_vstrs_nonzero_cc + clgrjh %r2,%r4,.Lhaystack_too_small + vl %v16,0(%r2) /* Next part of haystack. */ + clgrjle %r2,%r0,.Lloop64 + j .Lloop +END(MEMMEM_ARCH13) + +# if ! HAVE_MEMMEM_IFUNC +strong_alias (MEMMEM_ARCH13, __memmem) +weak_alias (__memmem, memmem) +# endif + +# if MEMMEM_Z13_ONLY_USED_AS_FALLBACK && defined SHARED && IS_IN (libc) +weak_alias (MEMMEM_ARCH13, __GI_memmem) +strong_alias (MEMMEM_ARCH13, __GI___memmem) +# endif +#endif Index: glibc-2.26/sysdeps/s390/memmem-vx.c =================================================================== --- glibc-2.26.orig/sysdeps/s390/memmem-vx.c +++ glibc-2.26/sysdeps/s390/memmem-vx.c @@ -20,7 +20,7 @@ #if HAVE_MEMMEM_Z13 # include <string.h> -# if HAVE_MEMMEM_IFUNC +# if HAVE_MEMMEM_IFUNC || MEMMEM_Z13_ONLY_USED_AS_FALLBACK # ifndef _LIBC # define memmem MEMMEM_Z13 @@ -32,7 +32,7 @@ # undef libc_hidden_def # undef libc_hidden_weak -# if HAVE_MEMMEM_C +# if HAVE_MEMMEM_C || MEMMEM_Z13_ONLY_USED_AS_FALLBACK # define libc_hidden_def(name) # define libc_hidden_weak(name) # else Index: glibc-2.26/sysdeps/s390/memmem.c =================================================================== --- glibc-2.26.orig/sysdeps/s390/memmem.c +++ glibc-2.26/sysdeps/s390/memmem.c @@ -34,8 +34,14 @@ extern __typeof (__redirect_memmem) MEMM extern __typeof (__redirect_memmem) MEMMEM_Z13 attribute_hidden; # endif +# if HAVE_MEMMEM_ARCH13 +extern __typeof (__redirect_memmem) MEMMEM_ARCH13 attribute_hidden; +# endif + s390_libc_ifunc_expr (__redirect_memmem, __memmem, - (HAVE_MEMMEM_Z13 && (hwcap & HWCAP_S390_VX)) + (HAVE_MEMMEM_ARCH13 && (hwcap & HWCAP_S390_VXRS_EXT2)) + ? MEMMEM_ARCH13 + : (HAVE_MEMMEM_Z13 && (hwcap & HWCAP_S390_VX)) ? MEMMEM_Z13 : MEMMEM_DEFAULT ) 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 @@ -128,6 +128,10 @@ __libc_ifunc_impl_list (const char *name #if HAVE_MEMMEM_IFUNC IFUNC_IMPL (i, name, memmem, +# if HAVE_MEMMEM_ARCH13 + IFUNC_IMPL_ADD (array, i, memmem, + dl_hwcap & HWCAP_S390_VXRS_EXT2, MEMMEM_ARCH13) +# endif # if HAVE_MEMMEM_Z13 IFUNC_IMPL_ADD (array, i, memmem, dl_hwcap & HWCAP_S390_VX, MEMMEM_Z13)
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