mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
04277e02d7
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
229 lines
7.1 KiB
ArmAsm
229 lines
7.1 KiB
ArmAsm
/* Vector optimized 32/64 bit S/390 version of wcpncpy.
|
|
Copyright (C) 2015-2019 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/>. */
|
|
|
|
#include <ifunc-wcpncpy.h>
|
|
#if HAVE_WCPNCPY_Z13
|
|
|
|
# include "sysdep.h"
|
|
# include "asm-syntax.h"
|
|
|
|
.text
|
|
|
|
/* wchar_t * wcpncpy (wchar_t *dest, const wchar_t *src, size_t n)
|
|
Copies at most n characters of string src to dest
|
|
returning a pointer to its end or dest+n
|
|
if src is smaller than n.
|
|
|
|
Register usage:
|
|
-%r0 = return value
|
|
-%r1 = zero byte index
|
|
-%r2 = curr dst pointer
|
|
-%r3 = curr src pointer
|
|
-%r4 = n
|
|
-%r5 = current_len
|
|
-%r6 = loaded bytes
|
|
-%r7 = border, tmp
|
|
*/
|
|
ENTRY(WCPNCPY_Z13)
|
|
.machine "z13"
|
|
.machinemode "zarch_nohighgprs"
|
|
|
|
# if !defined __s390x__
|
|
llgfr %r4,%r4
|
|
# endif /* !defined __s390x__ */
|
|
|
|
clgfi %r4,0
|
|
ber %r14 /* Nothing to do, if n == 0. */
|
|
|
|
vlbb %v16,0(%r3),6 /* Load s until next 4k-byte boundary. */
|
|
|
|
tmll %r3,3 /* Test if s is 4-byte aligned? */
|
|
jne .Lfallback /* And use common-code variant if not. */
|
|
|
|
vlvgp %v31,%r6,%r7 /* Save registers. */
|
|
lghi %r5,0 /* current_len = 0. */
|
|
|
|
lcbb %r6,0(%r3),6 /* Get bytes to 4k-byte boundary or 16. */
|
|
llgfr %r6,%r6 /* Convert 32bit to 64bit. */
|
|
|
|
/* Check range of maxlen and convert to byte-count. */
|
|
# ifdef __s390x__
|
|
tmhh %r4,49152 /* Test bit 0 or 1 of maxlen. */
|
|
lghi %r1,-4 /* Max byte-count is 18446744073709551612. */
|
|
# else
|
|
tmlh %r4,49152 /* Test bit 0 or 1 of maxlen. */
|
|
llilf %r1,4294967292 /* Max byte-count is 4294967292. */
|
|
# endif /* !__s390x__ */
|
|
sllg %r4,%r4,2 /* Convert character-count to byte-count. */
|
|
locgrne %r4,%r1 /* Use max byte-count, if bit 0/1 was one. */
|
|
|
|
la %r0,0(%r4,%r2) /* Save destination pointer + n for return. */
|
|
|
|
clgrjle %r4,%r6,.Lremaining_v16 /* If n <= loaded-bytes
|
|
-> process remaining. */
|
|
|
|
/* n > loaded-byte-count */
|
|
vfenezf %v17,%v16,%v16 /* Find element not equal with zero search. */
|
|
vlgvb %r1,%v17,7 /* Load zero index or 16 if not found. */
|
|
aghi %r1,3 /* Also copy remaining bytes of zero. */
|
|
clrjl %r1,%r6,.Lfound_v16_store /* Found zero within loaded bytes,
|
|
copy and return. */
|
|
|
|
/* Align s to 16 byte. */
|
|
risbgn %r7,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
|
|
lghi %r5,15 /* current_len = 15. */
|
|
slr %r5,%r7 /* Compute highest index to 16byte boundary. */
|
|
|
|
/* Zero not found and n > loaded-byte-count. */
|
|
vstl %v16,%r5,0(%r2) /* Copy loaded characters - no zero. */
|
|
ahi %r5,1 /* Start loop at next character. */
|
|
|
|
/* Now we are 16byte aligned, so we can load a full vreg
|
|
without page fault. */
|
|
lgr %r1,%r5 /* If %r5 + 64 < maxlen? -> loop64. */
|
|
aghi %r1,64
|
|
clgrjl %r1,%r4,.Lloop64
|
|
|
|
vl %v16,0(%r5,%r3) /* Load s. */
|
|
clgijl %r4,17,.Lremaining_v16 /* If n <=16,
|
|
process remaining bytes. */
|
|
.Llt64:
|
|
lgr %r7,%r4
|
|
slgfi %r7,16 /* border_len = n - 16. */
|
|
|
|
clgrjhe %r5,%r7,.Lremaining_v16 /* If current_len >= border
|
|
then process remaining bytes. */
|
|
vfenezfs %v17,%v16,%v16 /* Find element not equal with zero search. */
|
|
je .Lfound_v16 /* 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. */
|
|
aghi %r5,16
|
|
|
|
clgrjhe %r5,%r7,.Lremaining_v18
|
|
vfenezfs %v17,%v18,%v18
|
|
je .Lfound_v18
|
|
vl %v16,16(%r5,%r3)
|
|
vst %v18,0(%r5,%r2)
|
|
aghi %r5,16
|
|
|
|
clgrjhe %r5,%r7,.Lremaining_v16
|
|
vfenezfs %v17,%v16,%v16
|
|
je .Lfound_v16
|
|
vl %v18,16(%r5,%r3)
|
|
vst %v16,0(%r5,%r2)
|
|
aghi %r5,16
|
|
|
|
.Lremaining_v18:
|
|
vlr %v16,%v18
|
|
.Lremaining_v16:
|
|
/* v16 contains the remaining bytes [1...16].
|
|
Store remaining bytes and append string-termination. */
|
|
vfenezf %v17,%v16,%v16 /* Find element not equal with zero search. */
|
|
slgrk %r7,%r4,%r5 /* Remaining bytes = maxlen - current_len */
|
|
aghi %r7,-1 /* vstl needs highest index. */
|
|
la %r2,0(%r5,%r2) /* vstl has no index register. */
|
|
vlgvb %r1,%v17,7 /* Load zero index or 16 if not found. */
|
|
aghi %r1,3 /* Also copy remaining bytes of zero. */
|
|
/* Zero in remaining bytes? -> jump away (zero-index <= max-index). */
|
|
clrjle %r1,%r7,.Lfound_v16_store
|
|
vstl %v16,%r7,0(%r2) /* Store remaining bytes without null
|
|
termination! */
|
|
.Lend:
|
|
/* Restore saved registers. */
|
|
vlgvg %r6,%v31,0
|
|
vlgvg %r7,%v31,1
|
|
lgr %r2,%r0 /* Load saved dest-ptr. */
|
|
br %r14
|
|
|
|
.Lfound_v16_32:
|
|
aghi %r5,32
|
|
j .Lfound_v16
|
|
.Lfound_v18_48:
|
|
aghi %r5,32
|
|
.Lfound_v18_16:
|
|
aghi %r5,16
|
|
.Lfound_v18:
|
|
vlr %v16,%v18
|
|
.Lfound_v16:
|
|
/* v16 contains a zero. Store remaining bytes to zero. current_len
|
|
has not reached border, thus checking for n is not needed! */
|
|
vlgvb %r1,%v17,7 /* Load byte index of zero. */
|
|
la %r2,0(%r5,%r2) /* vstl has no support for index-register. */
|
|
aghi %r1,3 /* Also copy remaining bytes of zero. */
|
|
.Lfound_v16_store:
|
|
vstl %v16,%r1,0(%r2) /* Copy characters including zero. */
|
|
/* Fill remaining bytes with zero - remaining byte count always > 0. */
|
|
algr %r5,%r1 /* Remaining bytes (=%r4) = ... */
|
|
slgr %r4,%r5 /* = n - (currlen + zero_index + 1) */
|
|
la %r2,0(%r1,%r2) /* Pointer to zero. start filling beyond. */
|
|
lay %r0,-3(%r2) /* Save return-pointer to found zero. */
|
|
clgije %r4,1,.Lend /* Skip zero-filling, if found-zero is last
|
|
possible character.
|
|
(1 is substracted from r4 below!). */
|
|
aghi %r4,-2 /* mvc with exrl needs count - 1.
|
|
(additional -1, see remaining bytes above) */
|
|
srlg %r6,%r4,8 /* Split into 256 byte blocks. */
|
|
ltgr %r6,%r6
|
|
je .Lzero_lt256
|
|
.Lzero_loop256:
|
|
mvc 1(256,%r2),0(%r2) /* Fill 256 zeros at once. */
|
|
la %r2,256(%r2)
|
|
brctg %r6,.Lzero_loop256 /* Loop until all blocks are processed. */
|
|
.Lzero_lt256:
|
|
exrl %r4,.Lmvc_lt256
|
|
j .Lend
|
|
.Lmvc_lt256:
|
|
mvc 1(1,%r2),0(%r2)
|
|
|
|
/* Find zero in 16byte aligned loop. */
|
|
.Lloop64:
|
|
vl %v16,0(%r5,%r3)
|
|
vfenezfs %v17,%v16,%v16 /* Find element not equal with zero search. */
|
|
je .Lfound_v16 /* 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
|
|
lgr %r1,%r5 /* If %r5 + 64 < maxlen? -> loop64. */
|
|
aghi %r1,64
|
|
clgrjl %r1,%r4,.Lloop64
|
|
|
|
vl %v16,0(%r5,%r3) /* Load s. */
|
|
j .Llt64
|
|
|
|
.Lfallback:
|
|
jg WCPNCPY_C
|
|
END(WCPNCPY_Z13)
|
|
|
|
# if ! HAVE_WCPNCPY_IFUNC
|
|
strong_alias (WCPNCPY_Z13, __wcpncpy)
|
|
weak_alias (__wcpncpy, wcpncpy)
|
|
# endif
|
|
#endif
|