89bfcbdf9d
The ifunc handling for memrchr is adjusted in order to omit ifunc variants if those will never be used as the minimum architecture level already supports newer CPUs by default. ChangeLog: * sysdeps/s390/multiarch/Makefile (sysdep_routines): Remove memrchr variants. * sysdeps/s390/Makefile (sysdep_routines): Add memrchr variants. * sysdeps/s390/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list): Refactor ifunc handling for memrchr. * sysdeps/s390/multiarch/memrchr-c.c: Move to ... * sysdeps/s390/memrchr-c.c: ... here and adjust ifunc handling. * sysdeps/s390/multiarch/memrchr-vx.S: Move to ... * sysdeps/s390/memrchr-vx.S: ... here and adjust ifunc handling. * sysdeps/s390/multiarch/memrchr.c: Move to ... * sysdeps/s390/memrchr.c: ... here and adjust ifunc handling. * sysdeps/s390/ifunc-memrchr.h: New file.
169 lines
4.2 KiB
ArmAsm
169 lines
4.2 KiB
ArmAsm
/* Vector optimized 32/64 bit S/390 version of memrchr.
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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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#include <ifunc-memrchr.h>
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#if HAVE_MEMRCHR_Z13
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# include "sysdep.h"
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# include "asm-syntax.h"
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.text
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/* void *memrchr (const void *s, int c, size_t n)
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Scans memory for character c backwards
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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=s in loop
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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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-v20=permute pattern
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*/
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ENTRY(MEMRCHR_Z13)
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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,.Lnot_found
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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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llcr %r3,%r3 /* char c_char = (char) c. */
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/* check byte n - 1. */
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llc %r0,-1(%r4,%r2)
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slgfi %r4,1
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clrje %r0,%r3,.Lfound_end
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jh .Lnot_found /* Return NULL if n is now 0. */
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larl %r1,.Lpermute_mask /* Load permute mask. */
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vl %v20,0(%r1)
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/* check byte n - 2. */
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llc %r0,-1(%r4,%r2)
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slgfi %r4,1
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clrje %r0,%r3,.Lfound_end
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jh .Lnot_found /* Return NULL if n is now 0. */
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clgijhe %r4,64,.Lloop64 /* If n >= 64 -> loop64. */
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.Llt64:
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/* Process n < 64 bytes. */
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clgijl %r4,16,.Llt16 /* Jump away if n < 16. */
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aghi %r4,-16
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vl %v16,0(%r4,%r2)
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vfeebs %v17,%v16,%v18
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jno .Lfound0
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clgijl %r4,16,.Llt16
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aghi %r4,-16
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vl %v16,0(%r4,%r2)
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vfeebs %v17,%v16,%v18
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jno .Lfound0
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clgijl %r4,16,.Llt16
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aghi %r4,-16
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vl %v16,0(%r4,%r2)
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vfeebs %v17,%v16,%v18
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jno .Lfound0
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.Llt16:
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clgfi %r4,0 /* if remaining bytes == 0, return NULL. */
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locghie %r2,0
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ber %r14
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aghi %r4,-1 /* vll needs highest index. */
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vll %v16,%r4,0(%r2) /* Load remaining bytes. */
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/* Right-shift of v16 to mask bytes after highest index. */
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lhi %r0,15
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slr %r0,%r4 /* Compute byte count for vector shift right. */
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sll %r0,3 /* Convert to bit count. */
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vlvgb %v17,%r0,7
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vsrlb %v16,%v16,%v17 /* Vector shift right by byte by number of bytes
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specified in bits 1-4 of byte 7 in v17. */
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j .Lfound_permute
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.Lfound48:
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aghi %r4,16
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.Lfound32:
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aghi %r4,16
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.Lfound16:
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aghi %r4,16
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.Lfound0:
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la %r2,0(%r4,%r2) /* Set pointer to start of v16. */
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lghi %r4,15 /* Set highest index in v16 to last index. */
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.Lfound_permute:
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/* Search for a c in v16 in reversed byte order. v16 contains %r4 + 1
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bytes. If v16 was not fully loaded, the bytes are already
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right shifted, so that the bytes in v16 can simply be reversed. */
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vperm %v16,%v16,%v16,%v20 /* Permute v16 to reversed order. */
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vfeeb %v16,%v16,%v18 /* Find c in reversed v16. */
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vlgvb %r1,%v16,7 /* Index of c or 16 if not found. */
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/* Return NULL if there is no c in loaded bytes. */
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clrjh %r1,%r4,.Lnot_found
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slgr %r4,%r1
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.Lfound_end:
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la %r2,0(%r4,%r2) /* Return pointer to c. */
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br %r14
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.Lnot_found:
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lghi %r2,0
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br %r14
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.Lpermute_mask:
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.byte 0x0F,0x0E,0x0D,0x0C,0x0B,0x0A,0x09,0x08
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.byte 0x07,0x06,0x05,0x04,0x03,0x02,0x01,0x00
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.Lloop64:
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aghi %r4,-64
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vl %v16,48(%r4,%r2) /* Load 16bytes of memory area. */
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vfeebs %v17,%v16,%v18 /* Find c. */
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jno .Lfound48 /* Jump away if c was found. */
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vl %v16,32(%r4,%r2)
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vfeebs %v17,%v16,%v18
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jno .Lfound32
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vl %v16,16(%r4,%r2)
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vfeebs %v17,%v16,%v18
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jno .Lfound16
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vl %v16,0(%r4,%r2)
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vfeebs %v17,%v16,%v18
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jno .Lfound0
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clgijhe %r4,64,.Lloop64 /* If n >= 64 -> loop64. */
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j .Llt64
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END(MEMRCHR_Z13)
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# if ! HAVE_MEMRCHR_IFUNC
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strong_alias (MEMRCHR_Z13, __memrchr)
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weak_alias (__memrchr, memrchr)
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# endif
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#endif /* HAVE_MEMRCHR_Z13 */
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