1/* Optimized strcasecmp implementation for PowerPC32. 2 Copyright (C) 2011-2021 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19#include <sysdep.h> 20#include <locale-defines.h> 21 22/* int [r3] strcasecmp (const char *s1 [r3], const char *s2 [r4] ) 23 24 or if defined USE_IN_EXTENDED_LOCALE_MODEL: 25 26 int [r3] strcasecmp_l (const char *s1 [r3], const char *s2 [r4], 27 locale_t loc [r5]) */ 28 29#ifndef STRCMP 30# define __STRCMP __strcasecmp 31# define STRCMP strcasecmp 32#endif 33 34ENTRY (__STRCMP) 35 36#define rRTN r3 /* Return value */ 37#define rSTR1 r5 /* 1st string */ 38#define rSTR2 r4 /* 2nd string */ 39#define rLOCARG r5 /* 3rd argument: locale_t */ 40#define rCHAR1 r6 /* Byte read from 1st string */ 41#define rCHAR2 r7 /* Byte read from 2nd string */ 42#define rADDR1 r8 /* Address of tolower(rCHAR1) */ 43#define rADDR2 r12 /* Address of tolower(rCHAR2) */ 44#define rLWR1 r8 /* Byte tolower(rCHAR1) */ 45#define rLWR2 r12 /* Byte tolower(rCHAR2) */ 46#define rTMP r0 47#define rGOT r9 /* Address of the Global Offset Table */ 48#define rLOC r11 /* Default locale address */ 49 50 cmpw cr7, r3, r4 51#ifndef USE_IN_EXTENDED_LOCALE_MODEL 52# ifdef SHARED 53 mflr rTMP 54 bcl 20,31,.L1 55.L1: mflr rGOT 56 addis rGOT, rGOT, _GLOBAL_OFFSET_TABLE_-.L1@ha 57 addi rGOT, rGOT, _GLOBAL_OFFSET_TABLE_-.L1@l 58 lwz rLOC, __libc_tsd_LOCALE@got@tprel(rGOT) 59 add rLOC, rLOC, __libc_tsd_LOCALE@tls 60 lwz rLOC, 0(rLOC) 61 mtlr rTMP 62# else 63 lis rTMP,_GLOBAL_OFFSET_TABLE_@ha 64 la rLOC,_GLOBAL_OFFSET_TABLE_@l(rTMP) 65 lwz rLOC, __libc_tsd_LOCALE@got@tprel(rGOT) 66 add rLOC, rLOC, __libc_tsd_LOCALE@tls 67 lwz rLOC, 0(rLOC) 68# endif /* SHARED */ 69#else 70 mr rLOC, rLOCARG 71#endif 72 mr rSTR1, rRTN 73 lwz rLOC, LOCALE_CTYPE_TOLOWER(rLOC) 74 li rRTN, 0 75 beqlr cr7 76 77 /* Unrolling loop for POWER: loads are done with 'lbz' plus 78 offset and string descriptors are only updated in the end 79 of loop unrolling. */ 80 81L(loop): 82 lbz rCHAR1, 0(rSTR1) /* Load char from s1 */ 83 lbz rCHAR2, 0(rSTR2) /* Load char from s2 */ 84 sldi rADDR1, rCHAR1, 2 /* Calculate address for tolower(*s1) */ 85 sldi rADDR2, rCHAR2, 2 /* Calculate address for tolower(*s2) */ 86 lwzx rLWR1, rLOC, rADDR1 /* Load tolower(*s1) */ 87 lwzx rLWR2, rLOC, rADDR2 /* Load tolower(*s2) */ 88 cmpwi cr7, rCHAR1, 0 /* *s1 == '\0' ? */ 89 subf. r3, rLWR2, rLWR1 90 bnelr 91 beqlr cr7 92 lbz rCHAR1, 1(rSTR1) 93 lbz rCHAR2, 1(rSTR2) 94 sldi rADDR1, rCHAR1, 2 95 sldi rADDR2, rCHAR2, 2 96 lwzx rLWR1, rLOC, rADDR1 97 lwzx rLWR2, rLOC, rADDR2 98 cmpwi cr7, rCHAR1, 0 99 subf. r3, rLWR2, rLWR1 100 bnelr 101 beqlr cr7 102 lbz rCHAR1, 2(rSTR1) 103 lbz rCHAR2, 2(rSTR2) 104 sldi rADDR1, rCHAR1, 2 105 sldi rADDR2, rCHAR2, 2 106 lwzx rLWR1, rLOC, rADDR1 107 lwzx rLWR2, rLOC, rADDR2 108 cmpwi cr7, rCHAR1, 0 109 subf. r3, rLWR2, rLWR1 110 bnelr 111 beqlr cr7 112 lbz rCHAR1, 3(rSTR1) 113 lbz rCHAR2, 3(rSTR2) 114 /* Increment both string descriptors */ 115 addi rSTR1, rSTR1, 4 116 addi rSTR2, rSTR2, 4 117 sldi rADDR1, rCHAR1, 2 118 sldi rADDR2, rCHAR2, 2 119 lwzx rLWR1, rLOC, rADDR1 120 lwzx rLWR2, rLOC, rADDR2 121 cmpwi cr7, rCHAR1, 0 122 subf. r3, rLWR2, rLWR1 123 bnelr 124 bne cr7,L(loop) 125 blr 126END (__STRCMP) 127 128weak_alias (__STRCMP, STRCMP) 129libc_hidden_builtin_def (__STRCMP) 130