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Diffstat (limited to 'sysdeps/s390/multiarch/memrchr-vx.S')
| -rw-r--r-- | sysdeps/s390/multiarch/memrchr-vx.S | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/sysdeps/s390/multiarch/memrchr-vx.S b/sysdeps/s390/multiarch/memrchr-vx.S deleted file mode 100644 index c6b0d34692..0000000000 --- a/sysdeps/s390/multiarch/memrchr-vx.S +++ /dev/null @@ -1,160 +0,0 @@ -/* Vector optimized 32/64 bit S/390 version of memrchr. - Copyright (C) 2015-2017 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 - -/* void *memrchr (const void *s, int c, size_t n) - Scans memory for character c backwards - and returns pointer to first c. - - Register usage: - -r0=tmp - -r1=tmp - -r2=s - -r3=c - -r4=n - -r5=s in loop - - -v16=part of s - -v17=index of found c - -v18=c replicated - -v20=permute pattern -*/ -ENTRY(__memrchr_vx) - .machine "z13" - .machinemode "zarch_nohighgprs" - -# if !defined __s390x__ - llgfr %r4,%r4 -# endif /* !defined __s390x__ */ - clgije %r4,0,.Lnot_found - - vlvgb %v18,%r3,0 /* Generate vector which elements are all c. - If c > 255, c will be truncated. */ - vrepb %v18,%v18,0 - - llcr %r3,%r3 /* char c_char = (char) c. */ - - /* check byte n - 1. */ - llc %r0,-1(%r4,%r2) - slgfi %r4,1 - clrje %r0,%r3,.Lfound_end - jh .Lnot_found /* Return NULL if n is now 0. */ - - larl %r1,.Lpermute_mask /* Load permute mask. */ - vl %v20,0(%r1) - - /* check byte n - 2. */ - llc %r0,-1(%r4,%r2) - slgfi %r4,1 - clrje %r0,%r3,.Lfound_end - jh .Lnot_found /* Return NULL if n is now 0. */ - - clgijhe %r4,64,.Lloop64 /* If n >= 64 -> loop64. */ - -.Llt64: - /* Process n < 64 bytes. */ - clgijl %r4,16,.Llt16 /* Jump away if n < 16. */ - aghi %r4,-16 - vl %v16,0(%r4,%r2) - vfeebs %v17,%v16,%v18 - jno .Lfound0 - clgijl %r4,16,.Llt16 - aghi %r4,-16 - vl %v16,0(%r4,%r2) - vfeebs %v17,%v16,%v18 - jno .Lfound0 - clgijl %r4,16,.Llt16 - aghi %r4,-16 - vl %v16,0(%r4,%r2) - vfeebs %v17,%v16,%v18 - jno .Lfound0 -.Llt16: - clgfi %r4,0 /* if remaining bytes == 0, return NULL. */ - locghie %r2,0 - ber %r14 - - aghi %r4,-1 /* vll needs highest index. */ - vll %v16,%r4,0(%r2) /* Load remaining bytes. */ - - /* Right-shift of v16 to mask bytes after highest index. */ - lhi %r0,15 - slr %r0,%r4 /* Compute byte count for vector shift right. */ - sll %r0,3 /* Convert to bit count. */ - vlvgb %v17,%r0,7 - vsrlb %v16,%v16,%v17 /* Vector shift right by byte by number of bytes - specified in bits 1-4 of byte 7 in v17. */ - j .Lfound_permute - -.Lfound48: - aghi %r4,16 -.Lfound32: - aghi %r4,16 -.Lfound16: - aghi %r4,16 -.Lfound0: - la %r2,0(%r4,%r2) /* Set pointer to start of v16. */ - lghi %r4,15 /* Set highest index in v16 to last index. */ -.Lfound_permute: - /* Search for a c in v16 in reversed byte order. v16 contains %r4 + 1 - bytes. If v16 was not fully loaded, the bytes are already - right shifted, so that the bytes in v16 can simply be reversed. */ - vperm %v16,%v16,%v16,%v20 /* Permute v16 to reversed order. */ - vfeeb %v16,%v16,%v18 /* Find c in reversed v16. */ - vlgvb %r1,%v16,7 /* Index of c or 16 if not found. */ - - /* Return NULL if there is no c in loaded bytes. */ - clrjh %r1,%r4,.Lnot_found - - slgr %r4,%r1 -.Lfound_end: - la %r2,0(%r4,%r2) /* Return pointer to c. */ - br %r14 - -.Lnot_found: - lghi %r2,0 - br %r14 - -.Lpermute_mask: - .byte 0x0F,0x0E,0x0D,0x0C,0x0B,0x0A,0x09,0x08 - .byte 0x07,0x06,0x05,0x04,0x03,0x02,0x01,0x00 - -.Lloop64: - aghi %r4,-64 - vl %v16,48(%r4,%r2) /* Load 16bytes of memory area. */ - vfeebs %v17,%v16,%v18 /* Find c. */ - jno .Lfound48 /* Jump away if c was found. */ - vl %v16,32(%r4,%r2) - vfeebs %v17,%v16,%v18 - jno .Lfound32 - vl %v16,16(%r4,%r2) - vfeebs %v17,%v16,%v18 - jno .Lfound16 - vl %v16,0(%r4,%r2) - vfeebs %v17,%v16,%v18 - jno .Lfound0 - - clgijhe %r4,64,.Lloop64 /* If n >= 64 -> loop64. */ - j .Llt64 -END(__memrchr_vx) -#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */ |