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/* Optimized strcasecmp implementation for PowerPC32.
Copyright (C) 2011 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/>. */
#include <sysdep.h>
#include <bp-sym.h>
#include <bp-asm.h>
#include <locale-defines.h>
/* int [r3] strcasecmp (const char *s1 [r3], const char *s2 [r4] )
or if defined USE_IN_EXTENDED_LOCALE_MODEL:
int [r3] strcasecmp_l (const char *s1 [r3], const char *s2 [r4],
__locale_t loc [r5]) */
#ifndef STRCMP
# define __STRCMP __strcasecmp
# define STRCMP strcasecmp
#endif
ENTRY (BP_SYM (__STRCMP))
#define rRTN r3 /* Return value */
#define rSTR1 r5 /* 1st string */
#define rSTR2 r4 /* 2nd string */
#define rLOCARG r5 /* 3rd argument: locale_t */
#define rCHAR1 r6 /* Byte readed from 1st string */
#define rCHAR2 r7 /* Byte readed from 2nd string */
#define rADDR1 r8 /* Address of tolower(rCHAR1) */
#define rADDR2 r12 /* Address of tolower(rCHAR2) */
#define rLWR1 r8 /* Byte tolower(rCHAR1) */
#define rLWR2 r12 /* Byte tolower(rCHAR2) */
#define rTMP r0
#define rGOT r9 /* Address of the Global Offset Table */
#define rLOC r11 /* Default locale address */
cmpw cr7, r3, r4
#ifndef USE_IN_EXTENDED_LOCALE_MODEL
# ifdef SHARED
mflr rTMP
bcl 20,31,.L1
.L1: mflr rGOT
addis rGOT, rGOT, _GLOBAL_OFFSET_TABLE_-.L1@ha
addi rGOT, rGOT, _GLOBAL_OFFSET_TABLE_-.L1@l
lwz rLOC, __libc_tsd_LOCALE@got@tprel(rGOT)
add rLOC, rLOC, __libc_tsd_LOCALE@tls
lwz rLOC, 0(rLOC)
mtlr rTMP
# else
lis rTMP,_GLOBAL_OFFSET_TABLE_@ha
la rLOC,_GLOBAL_OFFSET_TABLE_@l(rTMP)
lwz rLOC, __libc_tsd_LOCALE@got@tprel(rGOT)
add rLOC, rLOC, __libc_tsd_LOCALE@tls
lwz rLOC, 0(rLOC)
# endif /* SHARED */
#else
mr rLOC, rLOCARG
#endif
mr rSTR1, rRTN
lwz rLOC, LOCALE_CTYPE_TOLOWER(rLOC)
li rRTN, 0
beqlr cr7
/* Unrolling loop for POWER: loads are done with 'lbz' plus
offset and string descriptors are only updated in the end
of loop unrolling. */
L(loop):
lbz rCHAR1, 0(rSTR1) /* Load char from s1 */
lbz rCHAR2, 0(rSTR2) /* Load char from s2 */
sldi rADDR1, rCHAR1, 2 /* Calculate address for tolower(*s1) */
sldi rADDR2, rCHAR2, 2 /* Calculate address for tolower(*s2) */
lwzx rLWR1, rLOC, rADDR1 /* Load tolower(*s1) */
lwzx rLWR2, rLOC, rADDR2 /* Load tolower(*s2) */
cmpwi cr7, rCHAR1, 0 /* *s1 == '\0' ? */
subf. r3, rLWR2, rLWR1
bnelr
beqlr cr7
lbz rCHAR1, 1(rSTR1)
lbz rCHAR2, 1(rSTR2)
sldi rADDR1, rCHAR1, 2
sldi rADDR2, rCHAR2, 2
lwzx rLWR1, rLOC, rADDR1
lwzx rLWR2, rLOC, rADDR2
cmpwi cr7, rCHAR1, 0
subf. r3, rLWR2, rLWR1
bnelr
beqlr cr7
lbz rCHAR1, 2(rSTR1)
lbz rCHAR2, 2(rSTR2)
sldi rADDR1, rCHAR1, 2
sldi rADDR2, rCHAR2, 2
lwzx rLWR1, rLOC, rADDR1
lwzx rLWR2, rLOC, rADDR2
cmpwi cr7, rCHAR1, 0
subf. r3, rLWR2, rLWR1
bnelr
beqlr cr7
lbz rCHAR1, 3(rSTR1)
lbz rCHAR2, 3(rSTR2)
/* Increment both string descriptors */
addi rSTR1, rSTR1, 4
addi rSTR2, rSTR2, 4
sldi rADDR1, rCHAR1, 2
sldi rADDR2, rCHAR2, 2
lwzx rLWR1, rLOC, rADDR1
lwzx rLWR2, rLOC, rADDR2
cmpwi cr7, rCHAR1, 0
subf. r3, rLWR2, rLWR1
bnelr
bne cr7,L(loop)
blr
END (BP_SYM (__STRCMP))
weak_alias (BP_SYM (__STRCMP), BP_SYM (STRCMP))
libc_hidden_builtin_def (__STRCMP)
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