157 lines
4.5 KiB
ArmAsm
157 lines
4.5 KiB
ArmAsm
/* Vector optimized 32/64 bit S/390 version of memccpy.
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Copyright (C) 2015-2017 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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