mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
171 lines
4.8 KiB
ArmAsm
171 lines
4.8 KiB
ArmAsm
/* Vector optimized 32/64 bit S/390 version of strcat.
|
|
Copyright (C) 2015-2025 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-strcat.h>
|
|
#if HAVE_STRCAT_Z13
|
|
|
|
# include "sysdep.h"
|
|
# include "asm-syntax.h"
|
|
|
|
.text
|
|
|
|
/* char * strcat (const char *dest, const char *src)
|
|
Concatenate two strings.
|
|
|
|
Register usage:
|
|
-r0=saved dest pointer for return
|
|
-r1=tmp
|
|
-r2=dest
|
|
-r3=src
|
|
-r4=tmp
|
|
-r5=current_len
|
|
-v16=part of src
|
|
-v17=index of zero
|
|
-v18=part of src
|
|
*/
|
|
ENTRY(STRCAT_Z13)
|
|
.machine "z13"
|
|
.machinemode "zarch_nohighgprs"
|
|
|
|
lgr %r0,%r2 /* Save destination pointer for return. */
|
|
|
|
/* STRLEN
|
|
r1 = loaded bytes (tmp)
|
|
r4 = zero byte index (tmp)
|
|
r2 = dst
|
|
*/
|
|
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. */
|
|
|
|
vfenezb %v16,%v16,%v16 /* Find element not equal with zero search. */
|
|
vlgvb %r5,%v16,7 /* Load zero index or 16 if not found. */
|
|
clrjl %r5,%r1,.Llen_end /* Found zero within loaded bytes, end. */
|
|
|
|
/* Align s to 16 byte. */
|
|
risbgn %r1,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
|
|
lghi %r5,16 /* current_len = 16. */
|
|
slr %r5,%r1 /* Compute bytes to 16bytes boundary. */
|
|
|
|
/* Find zero in 16byte aligned loop. */
|
|
.Llen_loop:
|
|
vl %v16,0(%r5,%r2) /* Load s. */
|
|
vfenezbs %v16,%v16,%v16 /* Find element not equal with zero search. */
|
|
je .Llen_found /* Jump away if zero was found. */
|
|
vl %v16,16(%r5,%r2)
|
|
vfenezbs %v16,%v16,%v16
|
|
je .Llen_found16
|
|
vl %v16,32(%r5,%r2)
|
|
vfenezbs %v16,%v16,%v16
|
|
je .Llen_found32
|
|
vl %v16,48(%r5,%r2)
|
|
vfenezbs %v16,%v16,%v16
|
|
je .Llen_found48
|
|
|
|
aghi %r5,64
|
|
j .Llen_loop /* No zero -> loop. */
|
|
|
|
.Llen_found48:
|
|
aghi %r5,16
|
|
.Llen_found32:
|
|
aghi %r5,16
|
|
.Llen_found16:
|
|
aghi %r5,16
|
|
.Llen_found:
|
|
vlgvb %r4,%v16,7 /* Load byte index of zero. */
|
|
algr %r5,%r4
|
|
|
|
.Llen_end:
|
|
/* STRCPY
|
|
%r1 = loaded bytes (tmp)
|
|
%r4 = zero byte index (tmp)
|
|
%r3 = curr src pointer
|
|
%r2 = curr dst pointer
|
|
*/
|
|
la %r2,0(%r5,%r2) /* strcpy at end of dst-string. */
|
|
|
|
vlbb %v16,0(%r3),6 /* Load s until next 4k-byte boundary. */
|
|
lcbb %r1,0(%r3),6 /* Get bytes to 4k-byte boundary or 16. */
|
|
|
|
vfenezb %v17,%v16,%v16 /* Find element not equal with zero search. */
|
|
vlgvb %r5,%v17,7 /* Load zero index or 16 if not found. */
|
|
clrjl %r5,%r1,.Lcpy_found_align /* If found zero within loaded bytes,
|
|
copy bytes before and return. */
|
|
|
|
/* Align s to 16 byte. */
|
|
risbgn %r4,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
|
|
lghi %r5,15 /* current_len = 15. */
|
|
slr %r5,%r4 /* Compute highest index to 16byte boundary. */
|
|
|
|
vstl %v16,%r5,0(%r2) /* Copy loaded characters - no zero. */
|
|
ahi %r5,1 /* Start loop at next character. */
|
|
|
|
/* Find zero in 16byte aligned loop. */
|
|
.Lcpy_loop:
|
|
vl %v16,0(%r5,%r3) /* Load s. */
|
|
vfenezbs %v17,%v16,%v16 /* Find element not equal with zero search. */
|
|
je .Lcpy_found_v16_0 /* Jump away if zero was found. */
|
|
vl %v18,16(%r5,%r3)/* Load next part of s. */
|
|
vst %v16,0(%r5,%r2) /* Store previous part without zero to dst. */
|
|
vfenezbs %v17,%v18,%v18
|
|
je .Lcpy_found_v18_16
|
|
vl %v16,32(%r5,%r3)
|
|
vst %v18,16(%r5,%r2)
|
|
vfenezbs %v17,%v16,%v16
|
|
je .Lcpy_found_v16_32
|
|
vl %v18,48(%r5,%r3)
|
|
vst %v16,32(%r5,%r2)
|
|
vfenezbs %v17,%v18,%v18
|
|
je .Lcpy_found_v18_48
|
|
vst %v18,48(%r5,%r2)
|
|
|
|
aghi %r5,64
|
|
j .Lcpy_loop /* No zero -> loop. */
|
|
|
|
.Lcpy_found_v16_32:
|
|
aghi %r5,32
|
|
.Lcpy_found_v16_0:
|
|
la %r4,0(%r5,%r2)
|
|
vlgvb %r1,%v17,7 /* Load byte index of zero. */
|
|
vstl %v16,%r1,0(%r4) /* Copy characters including zero. */
|
|
lgr %r2,%r0 /* Load saved dest-ptr. */
|
|
br %r14
|
|
|
|
.Lcpy_found_v18_48:
|
|
aghi %r5,32
|
|
.Lcpy_found_v18_16:
|
|
la %r4,16(%r5,%r2)
|
|
vlgvb %r1,%v17,7 /* Load byte index of zero. */
|
|
vstl %v18,%r1,0(%r4) /* Copy characters including zero. */
|
|
lgr %r2,%r0 /* Load saved dest-ptr. */
|
|
br %r14
|
|
|
|
.Lcpy_found_align:
|
|
vstl %v16,%r5,0(%r2) /* Copy characters including zero. */
|
|
lgr %r2,%r0 /* Load saved dest-ptr. */
|
|
br %r14
|
|
END(STRCAT_Z13)
|
|
|
|
# if ! HAVE_STRCAT_IFUNC
|
|
strong_alias (STRCAT_Z13, strcat)
|
|
# endif
|
|
|
|
# if ! HAVE_STRCAT_C && defined SHARED && IS_IN (libc)
|
|
strong_alias (STRCAT_Z13, __GI_strcat)
|
|
# endif
|
|
#endif
|