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101 lines
2.9 KiB
ArmAsm
101 lines
2.9 KiB
ArmAsm
/* Vector optimized 32/64 bit S/390 version of strchr.
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Copyright (C) 2015-2018 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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/* char *strchr (const char *s, int c)
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Locate character in string.
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Register usage:
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-r1=tmp
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-r2=s
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-r3=c
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-r4=tmp
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-r5=current_len
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-v16=part of s
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-v17=index of unequal
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-v18=replicated c
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*/
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ENTRY(__strchr_vx)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */
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lcbb %r1,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */
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lghi %r5,0 /* current_len = 0. */
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vlvgb %v18,%r3,0 /* Generate vector which elements are all c.
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If c > 255, c will be truncated. */
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vrepb %v18,%v18,0
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vfeezbs %v16,%v16,%v18 /* Find element equal with zero search. */
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vlgvb %r4,%v16,7 /* Load byte index of character or zero. */
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clrjl %r4,%r1,.Lfound /* Return if c/zero is in loaded bytes. */
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/* Align s to 16 byte. */
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risbgn %r4,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
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lghi %r5,16 /* current_len = 16. */
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slr %r5,%r4 /* Compute bytes to 16bytes boundary. */
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/* Find c/zero in 16 byte aligned loop */
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.Lloop:
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vl %v16,0(%r5,%r2) /* Load s. */
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vfeezbs %v16,%v16,%v18 /* Find element equal with zero search. */
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jno .Lfound /* Found c/zero (cc=0|1|2). */
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vl %v16,16(%r5,%r2)
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vfeezbs %v16,%v16,%v18
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jno .Lfound16
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vl %v16,32(%r5,%r2)
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vfeezbs %v16,%v16,%v18
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jno .Lfound32
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vl %v16,48(%r5,%r2)
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vfeezbs %v16,%v16,%v18
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jno .Lfound48
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aghi %r5,64
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j .Lloop /* No character and no zero -> loop. */
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.Lfound48:
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la %r5,16(%r5) /* Use la since aghi would clobber cc. */
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.Lfound32:
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la %r5,16(%r5)
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.Lfound16:
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la %r5,16(%r5)
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.Lfound:
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je .Lzero /* Found zero, but no c before that zero. */
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.Lcharacter:
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vlgvb %r4,%v16,7 /* Load byte index of character. */
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algr %r5,%r4
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la %r2,0(%r5,%r2) /* Return pointer to character. */
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br %r14
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.Lzero:
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llgcr %r3,%r3 /* char c_char = (char) c. */
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clije %r3,0,.Lcharacter /* Found zero and c is zero. */
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lghi %r2,0 /* Return null if character not found. */
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br %r14
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END(__strchr_vx)
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#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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