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/* Vector optimized 32/64 bit S/390 version of memmem.
Copyright (C) 2019-2025 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-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
jgh 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
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