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/* Vector optimized 32/64 bit S/390 version of wcscmp.
Copyright (C) 2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
# include "sysdep.h"
# include "asm-syntax.h"
.text
/* int wcscmp (const wchar_t *s1, const wchar_t *s2)
Compare two strings
Register usage:
-r1=loaded byte count s1
-r2=s1
-r3=s2
-r4=loaded byte coutn s2, tmp
-r5=current_len
-v16=part of s1
-v17=part of s2
-v18=index of unequal
*/
ENTRY(__wcscmp_vx)
.machine "z13"
.machinemode "zarch_nohighgprs"
lghi %r5,0 /* current_len = 0. */
.Lloop:
vlbb %v16,0(%r5,%r2),6 /* Load s1 to block boundary. */
vlbb %v17,0(%r5,%r3),6 /* Load s2 to block boundary. */
lcbb %r1,0(%r5,%r2),6 /* Get loaded byte count of s1. */
jo .Llt16_1 /* Jump away if vr is not fully loaded. */
lcbb %r4,0(%r5,%r3),6
jo .Llt16_2 /* Jump away if vr is not fully loaded. */
/* Both vrs are fully loaded. */
aghi %r5,16
vfenezfs %v18,%v16,%v17 /* Compare not equal with zero search. */
jno .Lfound
vlbb %v16,0(%r5,%r2),6
vlbb %v17,0(%r5,%r3),6
lcbb %r1,0(%r5,%r2),6
jo .Llt16_1
lcbb %r4,0(%r5,%r3),6
jo .Llt16_2
aghi %r5,16
vfenezfs %v18,%v16,%v17
jno .Lfound
vlbb %v16,0(%r5,%r2),6
vlbb %v17,0(%r5,%r3),6
lcbb %r1,0(%r5,%r2),6
jo .Llt16_1
lcbb %r4,0(%r5,%r3),6
jo .Llt16_2
aghi %r5,16
vfenezfs %v18,%v16,%v17
jno .Lfound
vlbb %v16,0(%r5,%r2),6
vlbb %v17,0(%r5,%r3),6
lcbb %r1,0(%r5,%r2),6
jo .Llt16_1
lcbb %r4,0(%r5,%r3),6
jo .Llt16_2
aghi %r5,16
vfenezfs %v18,%v16,%v17
jno .Lfound
j .Lloop
.Lcmp_one_char:
/* At least one of both strings is not 4-byte aligned
and there is no full character before next block-boundary.
Compare one character to get over the boundary and
proceed with normal loop! */
vlef %v16,0(%r5,%r2),0 /* Load one character. */
vlef %v17,0(%r5,%r3),0
lghi %r1,4 /* Loaded byte count is 4. */
j .Llt_cmp /* Proceed with comparision. */
.Llt16_1:
lcbb %r4,0(%r5,%r3),6 /* Get loaded byte count of s2. */
.Llt16_2:
clr %r1,%r4
locrh %r1,%r4 /* Get minimum of bytes loaded in s1/2. */
nill %r1,65532 /* Align bytes loaded to full characters. */
jz .Lcmp_one_char /* Jump away if no full char is available. */
.Llt_cmp:
algfr %r5,%r1 /* Add smallest loaded bytes to current_len. */
vfenezfs %v18,%v16,%v17 /* Compare not equal with zero search. */
vlgvb %r4,%v18,7 /* Get not equal index or 16 if all equal. */
clrjl %r4,%r1,.Lfound /* Jump away if miscompare is within loaded
bytes. */
j .Lloop
.Lfound:
/* vfenezf found an unequal element or zero.
This instruction compares unsigned words, but wchar_t is signed.
Thus we have to compare the found element again. */
vlgvb %r4,%v18,7 /* Extract not equal byte-index, */
srl %r4,2 /* Convert it to character-index. */
vlgvf %r3,%v16,0(%r4) /* Load character-values. */
vlgvf %r4,%v17,0(%r4)
cr %r3,%r4
je .Lend_equal
lghi %r2,1
lghi %r1,-1
locgrl %r2,%r1
br %r14
.Lend_equal:
lghi %r2,0
br %r14
END(__wcscmp_vx)
#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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