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253 lines
7.2 KiB
ArmAsm
253 lines
7.2 KiB
ArmAsm
/* Vector optimized 32/64 bit S/390 version of strncat.
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Copyright (C) 2015-2024 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-strncat.h>
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#if HAVE_STRNCAT_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 * strncat (const char *dest, const char *src, size_t n)
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Concatenate two strings - at most n characters of src.
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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=n
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-r5=current_len
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-r6=tmp
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-r7=tmp
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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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-v31=register save area for r6, r7
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*/
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ENTRY(STRNCAT_Z13)
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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 %r4,%r4
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# endif /* !defined __s390x__ */
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clgfi %r4,0
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ber %r14 /* Nothing to do, if n == 0. */
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lgr %r0,%r2 /* Save destination pointer for return. */
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vlvgp %v31,%r6,%r7 /* Save registers. */
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/* STRLEN
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%r1 = loaded bytes (tmp)
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%r6 = 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 %r1,%v16,7 /* Load byte index of zero. */
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algr %r5,%r1
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.Llen_end:
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/* STRCPY
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%r1 = zero byte index (tmp)
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%r6 = loaded bytes (tmp)
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%r3 = curr src pointer
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%r2 = curr dst pointer
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%r7 = border, tmp
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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 %r6,0(%r3),6 /* Get bytes to 4k-byte boundary or 16. */
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llgfr %r6,%r6 /* Convert 32bit to 64bit. */
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lghi %r5,0 /* current_len = 0. */
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clgrjle %r4,%r6,.Lcpy_remaining_v16 /* If n <= loaded-bytes
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-> process remaining. */
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/* n > loaded-byte-count. */
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vfenezb %v17,%v16,%v16 /* Find element not equal with zero search. */
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vlgvb %r1,%v17,7 /* Load zero index or 16 if not found. */
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clrjl %r1,%r6,.Lcpy_found_v16_store /* Found zero within loaded
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bytes, copy and return. */
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/* Align s to 16 byte. */
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risbgn %r7,%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,%r7 /* Compute highest index to 16byte boundary. */
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/* Zero not found and n > loaded-byte-count. */
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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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/*
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Now we are 16byte aligned, so we can load a full vreg
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without page fault.
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*/
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lgr %r1,%r5 /* If %r5 + 64 < maxlen? -> loop64. */
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aghi %r1,64
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clgrjl %r1,%r4,.Lcpy_loop64
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vl %v16,0(%r5,%r3) /* Load s. */
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clgijl %r4,17,.Lcpy_remaining_v16 /* If n <=16,
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process remaining bytes. */
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.Lcpy_lt64:
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lgr %r7,%r4
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slgfi %r7,16 /* border_len = n - 16. */
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/* If current_len >= border then process remaining bytes. */
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clgrjhe %r5,%r7,.Lcpy_remaining_v16
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vfenezbs %v17,%v16,%v16 /* Find element not equal with zero search. */
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je .Lcpy_found_v16 /* 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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aghi %r5,16
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clgrjhe %r5,%r7,.Lcpy_remaining_v18
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vfenezbs %v17,%v18,%v18
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je .Lcpy_found_v18
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vl %v16,16(%r5,%r3)
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vst %v18,0(%r5,%r2)
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aghi %r5,16
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clgrjhe %r5,%r7,.Lcpy_remaining_v16
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vfenezbs %v17,%v16,%v16
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je .Lcpy_found_v16
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vl %v18,16(%r5,%r3)
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vst %v16,0(%r5,%r2)
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aghi %r5,16
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.Lcpy_remaining_v18:
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vlr %v16,%v18
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.Lcpy_remaining_v16:
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/* v16 contains the remaining bytes [1...16].
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Store remaining bytes and append string-termination. */
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vfenezb %v17,%v16,%v16 /* Find element not equal with zero search. */
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slgrk %r7,%r4,%r5 /* Remaining bytes = maxlen - current_len. */
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aghi %r7,-1 /* vstl needs highest index. */
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vlgvb %r1,%v17,7 /* Load zero index or 16 if not found. */
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la %r2,0(%r5,%r2) /* vstl has no index register. */
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/* Zero-index within remaining-bytes, store up to zero and end. */
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clgrjle %r1,%r7,.Lcpy_found_v16_store
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vstl %v16,%r7,0(%r2) /* Store remaining bytes. */
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lghi %r1,0
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stc %r1,1(%r7,%r2) /* Store string-null-termination beyond n. */
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.Lcpy_end:
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/* Restore saved registers. */
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vlgvg %r6,%v31,0
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vlgvg %r7,%v31,1
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lgr %r2,%r0 /* Load saved dest-ptr. */
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br %r14
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.Lcpy_found_v16_32:
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aghi %r5,32
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j .Lcpy_found_v16
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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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aghi %r5,16
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.Lcpy_found_v18:
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vlr %v16,%v18
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.Lcpy_found_v16:
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/* v16 contains a zero. Store remaining bytes to zero. current_len
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has not reached border, thus checking for n is not needed! */
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vlgvb %r1,%v17,7 /* Load byte index of zero. */
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la %r2,0(%r5,%r2)
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.Lcpy_found_v16_store:
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vstl %v16,%r1,0(%r2) /* Copy characters including zero. */
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j .Lcpy_end
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/* Find zero in 16byte aligned loop. */
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.Lcpy_loop64:
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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 /* 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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lgr %r1,%r5 /* If %r5 + 64 < maxlen? -> loop64. */
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aghi %r1,64
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clgrjl %r1,%r4,.Lcpy_loop64
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vl %v16,0(%r5,%r3) /* Load s. */
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j .Lcpy_lt64
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END(STRNCAT_Z13)
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# if ! HAVE_STRNCAT_IFUNC
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strong_alias (STRNCAT_Z13, strncat)
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# endif
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# if ! HAVE_STRNCAT_C
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/* See string/strncat.c and define STRNCAT_PRIMARY. */
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strong_alias (STRNCAT_Z13, __strncat)
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# if defined SHARED && IS_IN (libc)
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strong_alias (__strncat, __GI___strncat)
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# endif
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# endif
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#endif
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