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- /* Vector optimized 32/64 bit S/390 version of wcpcpy.
- Copyright (C) 2015-2026 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-wcpcpy.h>
- #if HAVE_WCPCPY_Z13
- # include "sysdep.h"
- # include "asm-syntax.h"
- .text
- /* wchar_t * wcpcpy (const wchar_t *dest, const wchar_t *src)
- Copy string src to dest returning a pointer to its end.
- Register usage:
- -r0=border-len for switching to vector-instructions
- -r1=tmp
- -r2=dest and return value
- -r3=src
- -r4=tmp
- -r5=current_len
- -v16=part of src
- -v17=index of zero
- -v18=part of src
- */
- ENTRY(WCPCPY_Z13)
- .machine "z13"
- .machinemode "zarch_nohighgprs"
- 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. */
- tmll %r3,3 /* Test if s is 4-byte aligned? */
- jne .Lfallback /* And use common-code variant if not. */
- vfenezf %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,.Lfound_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. */
- .Lloop:
- vl %v16,0(%r5,%r3) /* Load s. */
- vfenezfs %v17,%v16,%v16 /* Find element not equal with zero search. */
- je .Lfound_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. */
- vfenezfs %v17,%v18,%v18
- je .Lfound_v18_16
- vl %v16,32(%r5,%r3)
- vst %v18,16(%r5,%r2)
- vfenezfs %v17,%v16,%v16
- je .Lfound_v16_32
- vl %v18,48(%r5,%r3)
- vst %v16,32(%r5,%r2)
- vfenezfs %v17,%v18,%v18
- je .Lfound_v18_48
- vst %v18,48(%r5,%r2)
- aghi %r5,64
- j .Lloop /* No zero found -> loop. */
- .Lfound_v16_32:
- aghi %r5,32
- .Lfound_v16_0:
- la %r3,0(%r5,%r2)
- vlgvb %r1,%v17,7 /* Load byte index of zero. */
- aghi %r1,3 /* Also copy remaining bytes of zero. */
- vstl %v16,%r1,0(%r3) /* Copy characters including zero. */
- lay %r2,-3(%r1,%r3) /* Return pointer to zero. */
- br %r14
- .Lfound_v18_48:
- aghi %r5,32
- .Lfound_v18_16:
- la %r3,16(%r5,%r2)
- vlgvb %r1,%v17,7 /* Load byte index of zero. */
- aghi %r1,3 /* Also copy remaining bytes of zero. */
- vstl %v18,%r1,0(%r3) /* Copy characters including zero. */
- lay %r2,-3(%r1,%r3) /* Return pointer to zero. */
- br %r14
- .Lfound_align:
- aghi %r5,3 /* Also copy remaining bytes of zero. */
- vstl %v16,%r5,0(%r2) /* Copy characters including zero. */
- lay %r2,-3(%r5,%r2) /* Return pointer to zero. */
- br %r14
- .Lfallback:
- jg WCPCPY_C
- END(WCPCPY_Z13)
- # if ! HAVE_WCPCPY_IFUNC
- strong_alias (WCPCPY_Z13, __wcpcpy)
- weak_alias (__wcpcpy, wcpcpy)
- # endif
- #endif
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