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/* Vector Optimized 32/64 bit S/390 version of wmemset.
Copyright (C) 2015-2018 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
/* wchar_t *wmemset(wchar_t *dest, wchar_t wc, size_t n)
Fill an array of wide-characters with a constant wide character
and returns dest.
Register usage:
-r0=tmp
-r1=tmp
-r2=dest or current-pointer
-r3=wc
-r4=n
-r5=tmp
-v16=replicated wc
-v17,v18,v19=copy of v16 for vstm
-v31=saved dest for return
*/
ENTRY(__wmemset_vx)
.machine "z13"
.machinemode "zarch_nohighgprs"
# if !defined __s390x__
llgfr %r4,%r4
# endif /* !defined __s390x__ */
vlvgg %v31,%r2,0 /* Save destination pointer for return. */
clgije %r4,0,.Lend
vlvgf %v16,%r3,0 /* Generate vector with wchar_t wc. */
vrepf %v16,%v16,0
/* Check range of maxlen and convert to byte-count. */
# ifdef __s390x__
tmhh %r4,49152 /* Test bit 0 or 1 of maxlen. */
lghi %r5,-4 /* Max byte-count is 18446744073709551612. */
# else
tmlh %r4,49152 /* Test bit 0 or 1 of maxlen. */
llilf %r5,4294967292 /* Max byte-count is 4294967292. */
# endif /* !__s390x__ */
sllg %r4,%r4,2 /* Convert character-count to byte-count. */
locgrne %r4,%r5 /* Use max byte-count, if bit 0/1 was one. */
/* Align dest to 16 byte. */
risbg %r0,%r2,60,128+63,0 /* Test if s is aligned and
%r3 = bits 60-63 'and' 15. */
je .Lpreloop /* If s is aligned, loop aligned. */
tmll %r2,3 /* Test if s is 4-byte aligned? */
jne .Lfallback /* And use common-code variant if not. */
lghi %r1,16
slr %r1,%r0 /* Compute byte count to load (16-x). */
clgr %r1,%r4
locgrh %r1,%r4 /* min (byte count, n) */
aghik %r5,%r1,-1 /* vstl needs highest index. */
vstl %v16,%r5,0(%r2) /* Store remaining bytes. */
clgrje %r1,%r4,.Lend /* Return if n bytes where set. */
slgr %r4,%r1 /* Compute remaining byte count. */
la %r2,0(%r1,%r2)
.Lpreloop:
/* Now we are 16-byte aligned. */
clgijl %r4,17,.Lremaining
srlg %r1,%r4,8 /* Split into 256byte blocks */
clgije %r1,0,.Lpreloop64
vlr %v17,%v16
vlr %v18,%v16
vlr %v19,%v16
.Lloop256:
vstm %v16,%v19,0(%r2)
vstm %v16,%v19,64(%r2)
vstm %v16,%v19,128(%r2)
vstm %v16,%v19,192(%r2)
la %r2,256(%r2)
brctg %r1,.Lloop256 /* Loop until all blocks are processed. */
llgfr %r4,%r4
nilf %r4,255 /* Get remaining bytes */
je .Lend /* Skip store remaining bytes if zero. */
.Lpreloop64:
clgijl %r4,17,.Lremaining
clgijl %r4,33,.Lpreloop16
srlg %r1,%r4,5 /* Split into 32byte blocks */
.Lloop32:
vst %v16,0(%r2)
vst %v16,16(%r2)
la %r2,32(%r2)
brctg %r1,.Lloop32 /* Loop until all blocks are processed. */
llgfr %r4,%r4
nilf %r4,31 /* Get remaining bytes */
je .Lend /* Skip store remaining bytes if zero. */
.Lpreloop16:
clgijl %r4,17,.Lremaining
srlg %r1,%r4,4 /* Split into 16byte blocks */
.Lloop16:
vst %v16,0(%r2)
la %r2,16(%r2)
brctg %r1,.Lloop16 /* Loop until all blocks are processed. */
llgfr %r4,%r4
nilf %r4,15 /* Get remaining bytes */
je .Lend /* Skip store remaining bytes if zero. */
.Lremaining:
aghi %r4,-1 /* vstl needs highest index. */
vstl %v16,%r4,0(%r2)
.Lend:
vlgvg %r2,%v31,0 /* Load saved dest for return value. */
br %r14
.Lfallback:
srlg %r4,%r4,2 /* Convert byte-count to character-count. */
jg __wmemset_c
END(__wmemset_vx)
#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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