mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 01:21:06 +00:00
581c785bf3
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
180 lines
6.0 KiB
ArmAsm
180 lines
6.0 KiB
ArmAsm
/* Vector optimized 32/64 bit S/390 version of strstr.
|
|
Copyright (C) 2019-2022 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
|
|
<https://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
|
|
jgh 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 %v18,0(%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
|