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Diffstat (limited to 'sysdeps/s390/multiarch/memchr-vx.S')
| -rw-r--r-- | sysdeps/s390/multiarch/memchr-vx.S | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/sysdeps/s390/multiarch/memchr-vx.S b/sysdeps/s390/multiarch/memchr-vx.S new file mode 100644 index 0000000000..e0aa9e691b --- /dev/null +++ b/sysdeps/s390/multiarch/memchr-vx.S @@ -0,0 +1,159 @@ +/* Vector optimized 32/64 bit S/390 version of memchr. + Copyright (C) 2015 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 *memchr (const void *s, int c, size_t n) + Scans memory for character c + and returns pointer to first c. + + Register usage: + -r0=tmp + -r1=tmp + -r2=s + -r3=c + -r4=n + -r5=current_len + -v16=part of s + -v17=index of found c + -v18=c replicated +*/ +ENTRY(__memchr_vx) + + .machine "z13" + .machinemode "zarch_nohighgprs" + +# if !defined __s390x__ + llgfr %r4,%r4 +# endif /* !defined __s390x__ */ + + clgije %r4,0,.Lnf_end /* If len == 0 then exit. */ + + vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */ + lcbb %r0,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */ + llgfr %r0,%r0 /* Convert 32bit to 64bit. */ + + vlvgb %v18,%r3,0 /* Generate vector which elements are all c. + if c > 255, c will be truncated. */ + vrepb %v18,%v18,0 + lghi %r5,16 /* current_len = 16. */ + + clgrjhe %r0,%r4,.Llastcmp /* If (bytes to boundary) >= n, + jump to lastcmp. */ + + vfeebs %v17,%v16,%v18 /* Find c. */ + vlgvb %r1,%v17,7 /* Load byte index of c. */ + clgrjl %r1,%r0,.Lfound2 /* Found c is within loaded bytes. */ + + /* Align s to 16 byte. */ + risbgn %r1,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */ + slr %r5,%r1 /* Compute bytes to 16bytes boundary. */ + + lgr %r0,%r5 /* If %r5 + 64 < n? -> loop64. */ + aghi %r0,64 + clgrjl %r0,%r4,.Lloop64 +.Llt64: + vl %v16,0(%r5,%r2) + aghi %r5,16 + clgrjhe %r5,%r4,.Llastcmp /* Do last compare if curr-len >= n. */ + vfeebs %v17,%v16,%v18 /* Find c. */ + jl .Lfound /* Jump away if c was found. */ + + vl %v16,0(%r5,%r2) + aghi %r5,16 + clgrjhe %r5,%r4,.Llastcmp + vfeebs %v17,%v16,%v18 + jl .Lfound + + vl %v16,0(%r5,%r2) + aghi %r5,16 + clgrjhe %r5,%r4,.Llastcmp + vfeebs %v17,%v16,%v18 + jl .Lfound + + vl %v16,0(%r5,%r2) + aghi %r5,16 + +.Llastcmp: + /* Use comparision result only if located within first n characters. + %r5: current_len; + %r4: n; + (current_len - n): [0...16[ + first ignored match index: vr-width - (current_len - n) ]0...16] + */ + vfeebs %v17,%v16,%v18 /* Find c. */ + slgrk %r4,%r5,%r4 /* %r5 = current_len - n. */ + lghi %r0,16 /* Register width = 16. */ + vlgvb %r1,%v17,7 /* Extract found index or 16 if all equal. */ + slr %r0,%r4 /* %r0 = first ignored match index. */ + clrjl %r1,%r0,.Lfound2 /* Go away if miscompare is below n bytes. */ + /* c not found within n-bytes. */ +.Lnf_end: + lghi %r2,0 /* Return null. */ + br %r14 + +.Lfound48: + aghi %r5,16 +.Lfound32: + aghi %r5,16 +.Lfound16: + aghi %r5,16 +.Lfound0: + aghi %r5,16 +.Lfound: + vlgvb %r1,%v17,7 /* Load byte index of c. */ +.Lfound2: + slgfi %r5,16 /* current_len -=16 */ + algr %r5,%r1 /* Zero byte index is added to current len. */ + la %r2,0(%r5,%r2) /* Return pointer to c. */ + br %r14 + + +.Lloop64: + vl %v16,0(%r5,%r2) + vfeebs %v17,%v16,%v18 /* Find c. */ + jl .Lfound0 /* Jump away if c was found. */ + vl %v16,16(%r5,%r2) + vfeebs %v17,%v16,%v18 + jl .Lfound16 + vl %v16,32(%r5,%r2) + vfeebs %v17,%v16,%v18 + jl .Lfound32 + vl %v16,48(%r5,%r2) + vfeebs %v17,%v16,%v18 + jl .Lfound48 + + aghi %r5,64 + lgr %r0,%r5 /* If %r5 + 64 < n? -> loop64. */ + aghi %r0,64 + clgrjl %r0,%r4,.Lloop64 + + j .Llt64 +END(__memchr_vx) + +# define memchr __memchr_c +# undef libc_hidden_builtin_def +# define libc_hidden_builtin_def(name) strong_alias(__memchr_c, __GI_memchr) +#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */ + +#include <memchr.S> |