mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 13:00:06 +00:00
148 lines
3.9 KiB
ArmAsm
148 lines
3.9 KiB
ArmAsm
/* Vector optimized 32/64 bit S/390 version of strnlen.
|
|
Copyright (C) 2015-2023 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-strnlen.h>
|
|
|
|
#if HAVE_STRNLEN_Z13
|
|
|
|
# include "sysdep.h"
|
|
# include "asm-syntax.h"
|
|
|
|
.text
|
|
|
|
/* size_t strnlen (const char *s, size_t maxlen)
|
|
Returns the number of characters in s or at most maxlen.
|
|
|
|
Register usage:
|
|
-r1=tmp
|
|
-r2=address of string
|
|
-r3=maxlen (number of characters to be read)
|
|
-r4=tmp
|
|
-r5=current_len and return_value
|
|
-v16=part of s
|
|
*/
|
|
ENTRY(STRNLEN_Z13)
|
|
.machine "z13"
|
|
.machinemode "zarch_nohighgprs"
|
|
|
|
# if !defined __s390x__
|
|
llgfr %r3,%r3
|
|
# endif /* !defined __s390x__ */
|
|
|
|
clgfi %r3,0 /* if maxlen == 0, return 0. */
|
|
locgre %r2,%r3
|
|
ber %r14
|
|
|
|
vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */
|
|
lcbb %r1,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */
|
|
llgfr %r1,%r1 /* Convert 32bit to 64bit. */
|
|
|
|
vfenezb %v16,%v16,%v16 /* Find element not equal with zero search. */
|
|
clgr %r1,%r3
|
|
locgrh %r1,%r3 /* loaded_byte_count
|
|
= min (loaded_byte_count, maxlen) */
|
|
|
|
vlgvb %r5,%v16,7 /* Load zero index or 16 if not found. */
|
|
clr %r5,%r1 /* If found zero within loaded bytes? */
|
|
locgrl %r2,%r5 /* Then copy return value. */
|
|
blr %r14 /* And return. */
|
|
|
|
clgr %r1,%r3 /* If loaded_byte_count == maxlen? */
|
|
locgre %r2,%r3 /* Then copy return value. */
|
|
ber %r14 /* And return. */
|
|
|
|
/* Align s to 16 byte. */
|
|
risbgn %r4,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
|
|
lghi %r5,16 /* current_len = 16. */
|
|
slr %r5,%r4 /* Compute bytes to 16bytes boundary. */
|
|
|
|
lgr %r1,%r5 /* If %r5 + 64 < maxlen? -> loop64. */
|
|
aghi %r1,64
|
|
clgrjl %r1,%r3,.Lloop64
|
|
|
|
/* Find zero in max 64byte with aligned s. */
|
|
.Llt64:
|
|
vl %v16,0(%r5,%r2) /* Load s. */
|
|
vfenezbs %v16,%v16,%v16 /* Find element not equal with zero search. */
|
|
je .Lfound /* Jump away if zero was found. */
|
|
aghi %r5,16
|
|
clgrjhe %r5,%r3,.Lfound /* current_len >= maxlen -> end. */
|
|
vl %v16,0(%r5,%r2)
|
|
vfenezbs %v16,%v16,%v16
|
|
je .Lfound
|
|
aghi %r5,16
|
|
clgrjhe %r5,%r3,.Lfound
|
|
vl %v16,0(%r5,%r2)
|
|
vfenezbs %v16,%v16,%v16
|
|
je .Lfound
|
|
aghi %r5,16
|
|
clgrjhe %r5,%r3,.Lfound
|
|
vl %v16,0(%r5,%r2)
|
|
vfenezbs %v16,%v16,%v16
|
|
j .Lfound
|
|
|
|
.Lfound48:
|
|
aghi %r5,16
|
|
.Lfound32:
|
|
aghi %r5,16
|
|
.Lfound16:
|
|
aghi %r5,16
|
|
.Lfound:
|
|
vlgvb %r4,%v16,7 /* Load byte index of zero or 16 if no zero. */
|
|
algr %r5,%r4
|
|
|
|
clgr %r5,%r3
|
|
locgrh %r5,%r3 /* Return min (current_len, maxlen). */
|
|
lgr %r2,%r5
|
|
br %r14
|
|
|
|
/* Find zero in 16 byte aligned loop. */
|
|
.Lloop64:
|
|
vl %v16,0(%r5,%r2) /* Load s. */
|
|
vfenezbs %v16,%v16,%v16 /* Find element not equal with zero search. */
|
|
je .Lfound /* Jump away if zero was found. */
|
|
vl %v16,16(%r5,%r2)
|
|
vfenezbs %v16,%v16,%v16
|
|
je .Lfound16
|
|
vl %v16,32(%r5,%r2)
|
|
vfenezbs %v16,%v16,%v16
|
|
je .Lfound32
|
|
vl %v16,48(%r5,%r2)
|
|
vfenezbs %v16,%v16,%v16
|
|
je .Lfound48
|
|
|
|
aghi %r5,64
|
|
lgr %r1,%r5 /* If %r5 + 64 < maxlen? -> loop64. */
|
|
aghi %r1,64
|
|
clgrjl %r1,%r3,.Lloop64
|
|
|
|
j .Llt64
|
|
END(STRNLEN_Z13)
|
|
|
|
# if ! HAVE_STRNLEN_IFUNC
|
|
strong_alias (STRNLEN_Z13, __strnlen)
|
|
weak_alias (__strnlen, strnlen)
|
|
# endif
|
|
|
|
# if ! HAVE_STRNLEN_C && defined SHARED && IS_IN (libc)
|
|
strong_alias (STRNLEN_Z13, __GI_strnlen)
|
|
strong_alias (STRNLEN_Z13, __GI___strnlen)
|
|
# endif
|
|
|
|
#endif /* HAVE_STRNLEN_Z13 */
|