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S390: Optimize memccpy.
This patch provides optimized versions of memccpy with the z13 vector instructions. ChangeLog: * sysdeps/s390/multiarch/memccpy-c.c: New File. * sysdeps/s390/multiarch/memccpy-vx.S: Likewise. * sysdeps/s390/multiarch/memccpy.c: Likewise. * sysdeps/s390/multiarch/Makefile (sysdep_routines): Add memccpy functions. * sysdeps/s390/multiarch/ifunc-impl-list-common.c (__libc_ifunc_impl_list_common): Add ifunc test for memccpy. * string/memccpy.c: Use MEMCCPY if defined.
This commit is contained in:
Stefan Liebler
Andreas Krebbel
parent
88eefd344b
commit
9b593dc305
11
ChangeLog
11
ChangeLog
@ -1,3 +1,14 @@
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2015-08-26 Stefan Liebler <stli@linux.vnet.ibm.com>
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* sysdeps/s390/multiarch/memccpy-c.c: New File.
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* sysdeps/s390/multiarch/memccpy-vx.S: Likewise.
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* sysdeps/s390/multiarch/memccpy.c: Likewise.
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* sysdeps/s390/multiarch/Makefile
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(sysdep_routines): Add memccpy functions.
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* sysdeps/s390/multiarch/ifunc-impl-list-common.c
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(__libc_ifunc_impl_list_common): Add ifunc test for memccpy.
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* string/memccpy.c: Use MEMCCPY if defined.
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2015-08-26 Stefan Liebler <stli@linux.vnet.ibm.com>
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* sysdeps/s390/multiarch/memchr-vx.S: New File.
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@ -20,6 +20,10 @@
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#undef __memccpy
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#undef memccpy
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#ifdef MEMCCPY
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# define __memccpy MEMCCPY
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#endif
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/* Copy no more than N bytes of SRC to DEST, stopping when C is found.
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Return the position in DEST one byte past where C was copied, or
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NULL if C was not found in the first N bytes of SRC. */
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@ -16,7 +16,8 @@ sysdep_routines += strlen strlen-vx strlen-c \
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strpbrk strpbrk-vx strpbrk-c \
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strcspn strcspn-vx strcspn-c \
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memchr memchr-vx \
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rawmemchr rawmemchr-vx rawmemchr-c
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rawmemchr rawmemchr-vx rawmemchr-c \
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memccpy memccpy-vx memccpy-c
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endif
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ifeq ($(subdir),wcsmbs)
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@ -131,6 +131,8 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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IFUNC_VX_IMPL (wmemchr);
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IFUNC_VX_IMPL (rawmemchr);
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IFUNC_VX_IMPL (memccpy);
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#endif /* HAVE_S390_VX_ASM_SUPPORT */
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return i;
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25
sysdeps/s390/multiarch/memccpy-c.c
Normal file
25
sysdeps/s390/multiarch/memccpy-c.c
Normal file
@ -0,0 +1,25 @@
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/* Default memccpy implementation for S/390.
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Copyright (C) 2015 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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# define MEMCCPY __memccpy_c
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# include <string.h>
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extern __typeof (__memccpy) __memccpy_c;
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# include <string/memccpy.c>
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#endif
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156
sysdeps/s390/multiarch/memccpy-vx.S
Normal file
156
sysdeps/s390/multiarch/memccpy-vx.S
Normal file
@ -0,0 +1,156 @@
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/* Vector optimized 32/64 bit S/390 version of memccpy.
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Copyright (C) 2015 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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/* void *memccpy (void * dest, const void *src, int c, size_t n)
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Copies no more than n bytes from src to dest,
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stopping when the character c is found
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and returns pointer next to c in dest or null if c not found.
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Register usage:
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-r0=tmp
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-r1=tmp
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-r2=dest
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-r3=src
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-r4=c
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-r5=n
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-r6=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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-v19=part #2 of s
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-v31=save area for r6
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*/
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ENTRY(__memccpy_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 %r5,%r5
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# endif /* !defined __s390x__ */
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vlvgp %v31,%r6,%r7 /* Save registers. */
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clgije %r5,0,.Lnf_end /* If len == 0 then exit. */
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vlbb %v16,0(%r3),6 /* Load s until next 4k-byte boundary. */
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lcbb %r0,0(%r3),6 /* Get bytes to 4k-byte boundary or 16. */
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llgfr %r0,%r0 /* Convert 32bit to 64bit. */
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vlvgb %v18,%r4,0 /* 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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lghi %r6,0 /* current_len = 0. */
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clgrjle %r5,%r0,.Lremaining_v16 /* If maxlen <= loaded-bytes
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-> Process remaining. */
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vfeebs %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,.Lfound_v16 /* Found c is within loaded bytes. */
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/* Align s to 16 byte. */
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risbgn %r1,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
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lghi %r6,15 /* current_len = 15. */
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slr %r6,%r1 /* Compute highest index to 16byte boundary. */
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vstl %v16,%r6,0(%r2) /* Store prcessed bytes */
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ahi %r6,1
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.Lpreloop1:
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/* Now we are 16byte aligned, so we can load
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a full vreg without page fault. */
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vl %v16,0(%r6,%r3) /* Load s. */
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clgijl %r5,17,.Lremaining_v16 /* If n <= 16,
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process remaining bytes. */
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lgr %r7,%r5
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slgfi %r7,16 /* border_len = n - 16. */
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j .Lloop1
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.Lloop2:
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vl %v16,16(%r6,%r3)
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vst %v19,0(%r6,%r2)
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aghi %r6,16
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.Lloop1:
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clgrjhe %r6,%r7,.Lremaining_v16 /* If current_len >= border
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then process remaining bytes. */
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vfeebs %v17,%v16,%v18 /* Find c. */
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jl .Lfound_v16 /* Jump away if c was found. */
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vl %v19,16(%r6,%r3) /* Load next s part. */
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vst %v16,0(%r6,%r2) /* Store previous part without c. */
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aghi %r6,16
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clgrjhe %r6,%r7,.Lremaining_v19
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vfeebs %v17,%v19,%v18
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jl .Lfound_v19
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vl %v16,16(%r6,%r3)
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vst %v19,0(%r6,%r2)
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aghi %r6,16
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clgrjhe %r6,%r7,.Lremaining_v16
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vfeebs %v17,%v16,%v18
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jl .Lfound_v16
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vl %v19,16(%r6,%r3)
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vst %v16,0(%r6,%r2)
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aghi %r6,16
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clgrjhe %r6,%r7,.Lremaining_v19
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vfeebs %v17,%v19,%v18
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jo .Lloop2
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.Lfound_v19:
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vlr %v16,%v19
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.Lfound_v16:
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/* v16 contains c. Store remaining bytes to c. currlen hasn´t
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reached border, thus checking for maxlen is not needed! */
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vlgvb %r1,%v17,7 /* Load byte index of c. */
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la %r2,0(%r6,%r2) /* vstl has no support for index-register. */
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.Lfound_v16_store:
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vstl %v16,%r1,0(%r2) /* Copy bytes including c. */
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la %r2,1(%r1,%r2) /* Return pointer next to c in dest. */
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vlgvg %r6,%v31,0
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vlgvg %r7,%v31,1
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br %r14
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.Lremaining_v19:
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vlr %v16,%v19
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.Lremaining_v16:
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/* v16 contains the remaining bytes [1...16].
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Check and store remaining bytes. */
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vfeebs %v17,%v16,%v18
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slgrk %r7,%r5,%r6 /* Remaining bytes = maxlen - current_len. */
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aghi %r7,-1 /* vstl needs highest index. */
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la %r2,0(%r6,%r2) /* vstl has no index register. */
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vlgvb %r1,%v17,7 /* Load index of c or 16 if not found. */
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/* c in remaining bytes? -> Jump away (c-index <= max-index) */
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clrjle %r1,%r7,.Lfound_v16_store
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vstl %v16,%r7,0(%r2) /* Store remaining bytes. */
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.Lnf_end:
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vlgvg %r6,%v31,0
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vlgvg %r7,%v31,1
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lghi %r2,0 /* Return null. */
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br %r14
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END(__memccpy_vx)
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#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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28
sysdeps/s390/multiarch/memccpy.c
Normal file
28
sysdeps/s390/multiarch/memccpy.c
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@ -0,0 +1,28 @@
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/* Multiple versions of memccpy.
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Copyright (C) 2015 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 <string.h>
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# include <ifunc-resolve.h>
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s390_vx_libc_ifunc (__memccpy)
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weak_alias (__memccpy, memccpy)
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#else
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# include <string/memccpy.c>
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#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
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