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171 lines
4.8 KiB
ArmAsm
171 lines
4.8 KiB
ArmAsm
/* Vector optimized 32/64 bit S/390 version of strcat.
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Copyright (C) 2015-2020 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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<https://www.gnu.org/licenses/>. */
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#include <ifunc-strcat.h>
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#if HAVE_STRCAT_Z13
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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 * strcat (const char *dest, const char *src)
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Concatenate two strings.
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Register usage:
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-r0=saved dest pointer for return
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-r1=tmp
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-r2=dest
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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(STRCAT_Z13)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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lgr %r0,%r2 /* Save destination pointer for return. */
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/* STRLEN
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r1 = loaded bytes (tmp)
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r4 = zero byte index (tmp)
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r2 = dst
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*/
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vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */
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lcbb %r1,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */
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vfenezb %v16,%v16,%v16 /* Find element not equal with zero search. */
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vlgvb %r5,%v16,7 /* Load zero index or 16 if not found. */
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clrjl %r5,%r1,.Llen_end /* Found zero within loaded bytes, end. */
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/* Align s to 16 byte. */
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risbgn %r1,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
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lghi %r5,16 /* current_len = 16. */
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slr %r5,%r1 /* Compute bytes to 16bytes boundary. */
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/* Find zero in 16byte aligned loop. */
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.Llen_loop:
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vl %v16,0(%r5,%r2) /* Load s. */
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vfenezbs %v16,%v16,%v16 /* Find element not equal with zero search. */
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je .Llen_found /* Jump away if zero was found. */
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vl %v16,16(%r5,%r2)
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vfenezbs %v16,%v16,%v16
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je .Llen_found16
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vl %v16,32(%r5,%r2)
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vfenezbs %v16,%v16,%v16
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je .Llen_found32
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vl %v16,48(%r5,%r2)
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vfenezbs %v16,%v16,%v16
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je .Llen_found48
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aghi %r5,64
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j .Llen_loop /* No zero -> loop. */
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.Llen_found48:
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aghi %r5,16
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.Llen_found32:
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aghi %r5,16
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.Llen_found16:
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aghi %r5,16
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.Llen_found:
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vlgvb %r4,%v16,7 /* Load byte index of zero. */
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algr %r5,%r4
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.Llen_end:
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/* STRCPY
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%r1 = loaded bytes (tmp)
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%r4 = zero byte index (tmp)
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%r3 = curr src pointer
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%r2 = curr dst pointer
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*/
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la %r2,0(%r5,%r2) /* strcpy at end of dst-string. */
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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,.Lcpy_found_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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.Lcpy_loop:
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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 .Lcpy_found_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 .Lcpy_found_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 .Lcpy_found_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 .Lcpy_found_v18_48
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vst %v18,48(%r5,%r2)
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aghi %r5,64
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j .Lcpy_loop /* No zero -> loop. */
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.Lcpy_found_v16_32:
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aghi %r5,32
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.Lcpy_found_v16_0:
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la %r4,0(%r5,%r2)
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vlgvb %r1,%v17,7 /* Load byte index of zero. */
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vstl %v16,%r1,0(%r4) /* Copy characters including zero. */
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lgr %r2,%r0 /* Load saved dest-ptr. */
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br %r14
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.Lcpy_found_v18_48:
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aghi %r5,32
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.Lcpy_found_v18_16:
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la %r4,16(%r5,%r2)
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vlgvb %r1,%v17,7 /* Load byte index of zero. */
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vstl %v18,%r1,0(%r4) /* Copy characters including zero. */
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lgr %r2,%r0 /* Load saved dest-ptr. */
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br %r14
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.Lcpy_found_align:
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vstl %v16,%r5,0(%r2) /* Copy characters including zero. */
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lgr %r2,%r0 /* Load saved dest-ptr. */
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br %r14
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END(STRCAT_Z13)
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# if ! HAVE_STRCAT_IFUNC
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strong_alias (STRCAT_Z13, strcat)
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# endif
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# if ! HAVE_STRCAT_C && defined SHARED && IS_IN (libc)
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strong_alias (STRCAT_Z13, __GI_strcat)
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# endif
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#endif
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