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/* Vector optimized 32/64 bit S/390 version of stpcpy.
Copyright (C) 2015-2016 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
<http://www.gnu.org/licenses/>. */
#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
# include "sysdep.h"
# include "asm-syntax.h"
.text
/* char * stpcpy (const char *dest, const char *src)
Copy string src to dest returning a pointer to its end.
Register usage:
-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(__stpcpy_vx)
.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. */
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,.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. */
vfenezbs %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. */
vfenezbs %v17,%v18,%v18
je .Lfound_v18_16
vl %v16,32(%r5,%r3)
vst %v18,16(%r5,%r2)
vfenezbs %v17,%v16,%v16
je .Lfound_v16_32
vl %v18,48(%r5,%r3)
vst %v16,32(%r5,%r2)
vfenezbs %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. */
vstl %v16,%r1,0(%r3) /* Copy characters including zero. */
la %r2,0(%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. */
vstl %v18,%r1,0(%r3) /* Copy characters including zero. */
la %r2,0(%r1,%r3) /* Return pointer to zero. */
br %r14
.Lfound_align:
vstl %v16,%r5,0(%r2) /* Copy characters including zero. */
la %r2,0(%r5,%r2) /* Return pointer to zero. */
br %r14
END(__stpcpy_vx)
#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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