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105 lines
3.2 KiB
ArmAsm
105 lines
3.2 KiB
ArmAsm
/* Vector optimized 32/64 bit S/390 version of stpcpy.
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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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/* char * stpcpy (const char *dest, const char *src)
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Copy string src to dest returning a pointer to its end.
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Register usage:
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-r1=tmp
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-r2=dest and return value
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-r3=src
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-r4=tmp
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-r5=current_len
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-v16=part of src
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-v17=index of zero
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-v18=part of src
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*/
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ENTRY(__stpcpy_vx)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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vlbb %v16,0(%r3),6 /* Load s until next 4k-byte boundary. */
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lcbb %r1,0(%r3),6 /* Get bytes to 4k-byte boundary or 16. */
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vfenezb %v17,%v16,%v16 /* Find element not equal with zero search. */
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vlgvb %r5,%v17,7 /* Load zero index or 16 if not found. */
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clrjl %r5,%r1,.Lfound_align /* If found zero within loaded bytes,
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copy bytes before and return. */
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/* Align s to 16 byte. */
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risbgn %r4,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
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lghi %r5,15 /* current_len = 15. */
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slr %r5,%r4 /* Compute highest index to 16byte boundary. */
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vstl %v16,%r5,0(%r2) /* Copy loaded characters - no zero. */
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ahi %r5,1 /* Start loop at next character. */
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/* Find zero in 16byte aligned loop. */
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.Lloop:
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vl %v16,0(%r5,%r3) /* Load s. */
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vfenezbs %v17,%v16,%v16 /* Find element not equal with zero search. */
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je .Lfound_v16_0 /* Jump away if zero was found. */
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vl %v18,16(%r5,%r3) /* Load next part of s. */
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vst %v16,0(%r5,%r2) /* Store previous part without zero to dst. */
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vfenezbs %v17,%v18,%v18
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je .Lfound_v18_16
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vl %v16,32(%r5,%r3)
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vst %v18,16(%r5,%r2)
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vfenezbs %v17,%v16,%v16
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je .Lfound_v16_32
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vl %v18,48(%r5,%r3)
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vst %v16,32(%r5,%r2)
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vfenezbs %v17,%v18,%v18
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je .Lfound_v18_48
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vst %v18,48(%r5,%r2)
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aghi %r5,64
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j .Lloop /* No zero found -> loop. */
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.Lfound_v16_32:
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aghi %r5,32
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.Lfound_v16_0:
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la %r3,0(%r5,%r2)
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vlgvb %r1,%v17,7 /* Load byte index of zero. */
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vstl %v16,%r1,0(%r3) /* Copy characters including zero. */
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la %r2,0(%r1,%r3) /* Return pointer to zero. */
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br %r14
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.Lfound_v18_48:
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aghi %r5,32
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.Lfound_v18_16:
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la %r3,16(%r5,%r2)
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vlgvb %r1,%v17,7 /* Load byte index of zero. */
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vstl %v18,%r1,0(%r3) /* Copy characters including zero. */
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la %r2,0(%r1,%r3) /* Return pointer to zero. */
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br %r14
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.Lfound_align:
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vstl %v16,%r5,0(%r2) /* Copy characters including zero. */
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la %r2,0(%r5,%r2) /* Return pointer to zero. */
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br %r14
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END(__stpcpy_vx)
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#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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