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149 lines
4.1 KiB
ArmAsm
149 lines
4.1 KiB
ArmAsm
/* Vector optimized 32/64 bit S/390 version of strncmp.
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Copyright (C) 2015-2023 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-strncmp.h>
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#if HAVE_STRNCMP_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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/* int strncmp (const char *s1, const char *s2, size_t n)
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Compare at most n characters of two strings.
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Register usage:
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-r0=tmp
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-r1=tmp
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-r2=s1
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-r3=s2
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-r4=n
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-r5=current_len
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-v16=part of s1
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-v17=part of s2
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-v18=index of unequal
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*/
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ENTRY(STRNCMP_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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clgije %r4,0,.Lend_equal /* Nothing to do if n == 0, */
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lghi %r5,0 /* current_len = 0. */
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.Lloop:
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vlbb %v16,0(%r5,%r2),6 /* Load s1 to block boundary. */
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vlbb %v17,0(%r5,%r3),6 /* Load s2 to block boundary. */
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lcbb %r0,0(%r5,%r2),6 /* Get loaded byte count of s1. */
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jo .Llt16_1 /* Jump away if vr is not fully loaded. */
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lcbb %r1,0(%r5,%r3),6 /* Get loaded byte count of s2. */
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jo .Llt16_2 /* Jump away if vr is not fully loaded. */
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aghi %r5,16 /* Both vrs are fully loaded. */
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clgrjhe %r5,%r4,.Llastcmp /* If current_len >= n ->last compare. */
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vfenezbs %v18,%v16,%v17 /* Compare not equal with zero search. */
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jno .Lfound
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vlbb %v16,0(%r5,%r2),6
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vlbb %v17,0(%r5,%r3),6
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lcbb %r0,0(%r5,%r2),6
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jo .Llt16_1
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lcbb %r1,0(%r5,%r3),6
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jo .Llt16_2
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aghi %r5,16
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clgrjhe %r5,%r4,.Llastcmp
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vfenezbs %v18,%v16,%v17
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jno .Lfound
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vlbb %v16,0(%r5,%r2),6
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vlbb %v17,0(%r5,%r3),6
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lcbb %r0,0(%r5,%r2),6
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jo .Llt16_1
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lcbb %r1,0(%r5,%r3),6
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jo .Llt16_2
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aghi %r5,16
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clgrjhe %r5,%r4,.Llastcmp
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vfenezbs %v18,%v16,%v17
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jno .Lfound
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vlbb %v16,0(%r5,%r2),6
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vlbb %v17,0(%r5,%r3),6
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lcbb %r0,0(%r5,%r2),6
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jo .Llt16_1
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lcbb %r1,0(%r5,%r3),6
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jo .Llt16_2
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aghi %r5,16
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clgrjhe %r5,%r4,.Llastcmp
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vfenezbs %v18,%v16,%v17
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jno .Lfound
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j .Lloop
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.Llt16_1:
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lcbb %r1,0(%r5,%r3),6 /* Get loaded byte count ofs2. */
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.Llt16_2:
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clr %r0,%r1 /* Compare logical. */
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locrh %r0,%r1 /* Compute minimum of bytes loaded. */
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algfr %r5,%r0 /* Add smallest loaded bytes to current_len. */
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clgrj %r5,%r4,10,.Llastcmp /* If current_len >= n ->last compare. */
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vfenezbs %v18,%v16,%v17 /* Compare not equal with zero search. */
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vlgvb %r1,%v18,7 /* Get not equal index or 16 if all equal. */
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clrjl %r1,%r0,.Lfound /* Jump away if miscompare is within
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loaded bytes (index < loaded-bytes) */
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j .Lloop
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.Llastcmp:
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/* Use comparison result only if located within first n characters.
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%r0: loaded byte count in vreg;
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%r5: current_len;
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%r4: n;
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(current_len - n): [0...16[
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First ignored match index: loaded bytes - (current_len-n): ]0...16]
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*/
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slgr %r5,%r4 /* %r5 = current_len - n. */
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slr %r0,%r5 /* %r0 = first ignored match index. */
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vfenezbs %v18,%v16,%v17 /* Compare not equal with zero search. */
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vlgvb %r1,%v18,7 /* Get not equal index or 16 if all equal. */
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clrjl %r1,%r0,.Lfound /* Jump away if miscompare is within
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loaded bytes and below n bytes. */
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j .Lend_equal /* Miscompare after n-bytes -> end equal. */
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.Lfound:
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/* Difference or end of string. */
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je .Lend_equal
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lghi %r2,1
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lghi %r1,-1
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locgrl %r2,%r1
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br %r14
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.Lend_equal:
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lghi %r2,0
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br %r14
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END(STRNCMP_Z13)
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# if ! HAVE_STRNCMP_IFUNC
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strong_alias (STRNCMP_Z13, strncmp)
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# endif
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# if ! HAVE_STRNCMP_C && defined SHARED && IS_IN (libc)
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strong_alias (STRNCMP_Z13, __GI_strncmp)
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# endif
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#endif /* HAVE_STRNCMP_Z13 */
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