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167 lines
4.5 KiB
ArmAsm
167 lines
4.5 KiB
ArmAsm
/* Vector optimized 32/64 bit S/390 version of wmemchr.
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Copyright (C) 2015-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
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# include "sysdep.h"
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# include "asm-syntax.h"
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.text
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/* wchar_t *wmemchr (const wchar_t *s, wchar_t c, size_t n)
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Scans memory for character c
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and returns pointer to first c.
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Register usage:
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-r0=tmp
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-r1=tmp
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-r2=s
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-r3=c
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-r4=n
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-r5=current_len
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-v16=part of s
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-v17=index of found c
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-v18=c replicated
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*/
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ENTRY(__wmemchr_vx)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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# if !defined __s390x__
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llgfr %r4,%r4
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# endif /* !defined __s390x__ */
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clgije %r4,0,.Lnf_end /* If len == 0 then exit. */
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vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */
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lcbb %r0,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */
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llgfr %r0,%r0 /* Convert 32bit to 64bit. */
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tmll %r2,3 /* Test if s is 4-byte aligned? */
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jne .Lfallback /* And use common-code variant if not. */
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vlvgf %v18,%r3,0 /* Generate vector which elements are all c. */
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vrepf %v18,%v18,0
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lghi %r5,16 /* current_len = 16. */
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/* Check range of maxlen and convert to byte-count. */
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# ifdef __s390x__
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tmhh %r4,49152 /* Test bit 0 or 1 of maxlen. */
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lghi %r1,-4 /* Max byte-count is 18446744073709551612. */
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# else
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tmlh %r4,49152 /* Test bit 0 or 1 of maxlen. */
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llilf %r1,4294967292 /* Max byte-count is 4294967292. */
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# endif /* !__s390x__ */
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sllg %r4,%r4,2 /* Convert character-count to byte-count. */
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locgrne %r4,%r1 /* Use max byte-count, if bit 0/1 was one. */
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clgrjhe %r0,%r4,.Llastcmp /* If (bytes to boundary) >= n,
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jump to lastcmp. */
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vfeefs %v17,%v16,%v18 /* Find c. */
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vlgvb %r1,%v17,7 /* Load byte index of c. */
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clgrjl %r1,%r0,.Lfound2 /* Found c is within loaded bytes. */
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/* Align s to 16 byte. */
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risbgn %r1,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
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slr %r5,%r1 /* Compute bytes to 16bytes boundary. */
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lgr %r0,%r5 /* If %r5 + 64 < n? -> loop64. */
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aghi %r0,64
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clgrjl %r0,%r4,.Lloop64
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.Llt64:
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vl %v16,0(%r5,%r2)
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aghi %r5,16
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clgrjhe %r5,%r4,.Llastcmp /* Do last compare if curr-len >= n. */
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vfeefs %v17,%v16,%v18 /* Find c. */
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jl .Lfound /* Jump away if c was found. */
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vl %v16,0(%r5,%r2)
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aghi %r5,16
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clgrjhe %r5,%r4,.Llastcmp
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vfeefs %v17,%v16,%v18
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jl .Lfound
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vl %v16,0(%r5,%r2)
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aghi %r5,16
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clgrjhe %r5,%r4,.Llastcmp
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vfeefs %v17,%v16,%v18
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jl .Lfound
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vl %v16,0(%r5,%r2)
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aghi %r5,16
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.Llastcmp:
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/* Use comparision result only if located within first n characters.
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%r5: current_len;
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%r4: n;
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(current_len - n): [0...16[
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first ignored match index = vr-width - (current_len - n) ]0...16]
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*/
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vfeefs %v17,%v16,%v18 /* Find c. */
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slgrk %r4,%r5,%r4 /* %r5 = current_len - n. */
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lghi %r0,16 /* Register width = 16. */
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vlgvb %r1,%v17,7 /* Extract found index or 16 if all equal. */
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slr %r0,%r4 /* %r0 = first ignored match index. */
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clrjl %r1,%r0,.Lfound2 /* Go away if miscompare is below n bytes. */
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/* c not found within n-bytes. */
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.Lnf_end:
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lghi %r2,0 /* Return null. */
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br %r14
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.Lfound48:
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aghi %r5,16
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.Lfound32:
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aghi %r5,16
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.Lfound16:
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aghi %r5,16
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.Lfound0:
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aghi %r5,16
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.Lfound:
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vlgvb %r1,%v17,7 /* Load byte index of c. */
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.Lfound2:
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slgfi %r5,16 /* current_len -=16 */
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algr %r5,%r1 /* Zero byte index is added to current len. */
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la %r2,0(%r5,%r2) /* Return pointer to c. */
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br %r14
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.Lloop64:
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vl %v16,0(%r5,%r2)
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vfeefs %v17,%v16,%v18 /* Find c. */
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jl .Lfound0 /* Jump away if c was found. */
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vl %v16,16(%r5,%r2)
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vfeefs %v17,%v16,%v18
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jl .Lfound16
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vl %v16,32(%r5,%r2)
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vfeefs %v17,%v16,%v18
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jl .Lfound32
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vl %v16,48(%r5,%r2)
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vfeefs %v17,%v16,%v18
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jl .Lfound48
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aghi %r5,64
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lgr %r0,%r5 /* If %r5 + 64 < n? -> loop64. */
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aghi %r0,64
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clgrjl %r0,%r4,.Lloop64
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j .Llt64
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.Lfallback:
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jg __wmemchr_c
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END(__wmemchr_vx)
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#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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