| 1 | /* Optimized strstr implementation for PowerPC64/POWER7. |
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| 2 | Copyright (C) 2015-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <sysdep.h> |
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| 20 | |
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| 21 | /* Char * [r3] strstr (char *s [r3], char * pat[r4]) */ |
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| 22 | |
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| 23 | /* The performance gain is obtained using aligned memory access, load |
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| 24 | * doubleword and usage of cmpb instruction for quicker comparison. */ |
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| 25 | |
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| 26 | #define ITERATIONS 64 |
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| 27 | |
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| 28 | #ifndef STRSTR |
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| 29 | # define STRSTR strstr |
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| 30 | #endif |
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| 31 | |
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| 32 | #ifndef STRLEN |
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| 33 | /* For builds with no IFUNC support, local calls should be made to internal |
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| 34 | GLIBC symbol (created by libc_hidden_builtin_def). */ |
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| 35 | # ifdef SHARED |
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| 36 | # define STRLEN __GI_strlen |
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| 37 | # define STRLEN_is_local |
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| 38 | # else |
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| 39 | # define STRLEN strlen |
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| 40 | # endif |
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| 41 | #endif |
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| 42 | |
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| 43 | #ifndef STRNLEN |
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| 44 | /* For builds with no IFUNC support, local calls should be made to internal |
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| 45 | GLIBC symbol (created by libc_hidden_builtin_def). */ |
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| 46 | # ifdef SHARED |
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| 47 | # define STRNLEN __GI_strnlen |
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| 48 | # define STRNLEN_is_local |
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| 49 | # else |
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| 50 | # define STRNLEN __strnlen |
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| 51 | # endif |
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| 52 | #endif |
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| 53 | |
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| 54 | #ifndef STRCHR |
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| 55 | # ifdef SHARED |
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| 56 | # define STRCHR __GI_strchr |
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| 57 | # define STRCHR_is_local |
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| 58 | # else |
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| 59 | # define STRCHR strchr |
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| 60 | # endif |
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| 61 | #endif |
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| 62 | |
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| 63 | #define FRAMESIZE (FRAME_MIN_SIZE+32) |
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| 64 | .machine power7 |
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| 65 | /* Can't be ENTRY_TOCLESS due to calling __strstr_ppc which uses r2. */ |
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| 66 | ENTRY (STRSTR, 4) |
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| 67 | CALL_MCOUNT 2 |
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| 68 | mflr r0 /* Load link register LR to r0. */ |
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| 69 | std r31, -8(r1) /* Save callers register r31. */ |
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| 70 | std r30, -16(r1) /* Save callers register r30. */ |
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| 71 | std r29, -24(r1) /* Save callers register r29. */ |
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| 72 | std r28, -32(r1) /* Save callers register r28. */ |
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| 73 | std r0, 16(r1) /* Store the link register. */ |
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| 74 | cfi_offset(r31, -8) |
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| 75 | cfi_offset(r30, -16) |
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| 76 | cfi_offset(r28, -32) |
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| 77 | cfi_offset(r29, -24) |
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| 78 | cfi_offset(lr, 16) |
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| 79 | stdu r1, -FRAMESIZE(r1) /* Create the stack frame. */ |
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| 80 | cfi_adjust_cfa_offset(FRAMESIZE) |
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| 81 | |
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| 82 | dcbt 0, r3 |
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| 83 | dcbt 0, r4 |
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| 84 | cmpdi cr7, r3, 0 |
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| 85 | beq cr7, L(retnull) |
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| 86 | cmpdi cr7, r4, 0 |
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| 87 | beq cr7, L(retnull) |
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| 88 | |
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| 89 | mr r29, r3 |
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| 90 | mr r30, r4 |
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| 91 | mr r3, r4 |
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| 92 | bl STRLEN |
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| 93 | #ifndef STRLEN_is_local |
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| 94 | nop |
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| 95 | #endif |
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| 96 | |
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| 97 | cmpdi cr7, r3, 0 /* If search str is null. */ |
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| 98 | beq cr7, L(ret_r3) |
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| 99 | |
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| 100 | mr r31, r3 |
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| 101 | mr r4, r3 |
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| 102 | mr r3, r29 |
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| 103 | bl STRNLEN |
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| 104 | #ifndef STRNLEN_is_local |
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| 105 | nop |
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| 106 | #endif |
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| 107 | |
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| 108 | cmpd cr7, r3, r31 /* If len(r3) < len(r4). */ |
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| 109 | blt cr7, L(retnull) |
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| 110 | mr r3, r29 |
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| 111 | lbz r4, 0(r30) |
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| 112 | bl STRCHR |
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| 113 | #ifndef STRCHR_is_local |
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| 114 | nop |
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| 115 | #endif |
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| 116 | |
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| 117 | mr r11, r3 |
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| 118 | /* If first char of search str is not present. */ |
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| 119 | cmpdi cr7, r3, 0 |
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| 120 | ble cr7, L(end) |
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| 121 | /* Reg r28 is used to count the number of iterations. */ |
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| 122 | li r28, 0 |
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| 123 | rldicl r8, r3, 0, 52 /* Page cross check. */ |
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| 124 | cmpldi cr7, r8, 4096-16 |
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| 125 | bgt cr7, L(bytebybyte) |
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| 126 | |
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| 127 | rldicl r8, r30, 0, 52 |
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| 128 | cmpldi cr7, r8, 4096-16 |
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| 129 | bgt cr7, L(bytebybyte) |
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| 130 | |
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| 131 | /* If len(r4) < 8 handle in a different way. */ |
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| 132 | /* Shift position based on null and use cmpb. */ |
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| 133 | cmpdi cr7, r31, 8 |
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| 134 | blt cr7, L(lessthan8) |
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| 135 | |
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| 136 | /* Len(r4) >= 8 reaches here. */ |
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| 137 | mr r8, r3 /* Save r3 for future use. */ |
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| 138 | mr r4, r30 /* Restore r4. */ |
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| 139 | li r0, 0 |
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| 140 | rlwinm r10, r30, 3, 26, 28 /* Calculate padding in bits. */ |
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| 141 | clrrdi r4, r4, 3 /* Make r4 aligned to 8. */ |
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| 142 | ld r6, 0(r4) |
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| 143 | addi r4, r4, 8 |
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| 144 | cmpdi cr7, r10, 0 /* Check if its already aligned? */ |
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| 145 | beq cr7, L(begin1) |
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| 146 | #ifdef __LITTLE_ENDIAN__ |
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| 147 | srd r6, r6, r10 /* Discard unwanted bits. */ |
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| 148 | #else |
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| 149 | sld r6, r6, r10 |
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| 150 | #endif |
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| 151 | ld r9, 0(r4) |
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| 152 | subfic r10, r10, 64 |
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| 153 | #ifdef __LITTLE_ENDIAN__ |
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| 154 | sld r9, r9, r10 /* Discard unwanted bits. */ |
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| 155 | #else |
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| 156 | srd r9, r9, r10 |
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| 157 | #endif |
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| 158 | or r6, r6, r9 /* Form complete search str. */ |
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| 159 | L(begin1): |
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| 160 | mr r29, r6 |
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| 161 | rlwinm r10, r3, 3, 26, 28 |
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| 162 | clrrdi r3, r3, 3 |
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| 163 | ld r5, 0(r3) |
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| 164 | cmpb r9, r0, r6 /* Check if input has null. */ |
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| 165 | cmpdi cr7, r9, 0 |
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| 166 | bne cr7, L(return3) |
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| 167 | cmpb r9, r0, r5 /* Check if input has null. */ |
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| 168 | #ifdef __LITTLE_ENDIAN__ |
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| 169 | srd r9, r9, r10 |
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| 170 | #else |
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| 171 | sld r9, r9, r10 |
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| 172 | #endif |
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| 173 | cmpdi cr7, r9, 0 |
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| 174 | bne cr7, L(retnull) |
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| 175 | |
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| 176 | li r12, -8 /* Shift values. */ |
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| 177 | li r11, 72 /* Shift values. */ |
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| 178 | cmpdi cr7, r10, 0 |
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| 179 | beq cr7, L(nextbyte1) |
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| 180 | mr r12, r10 |
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| 181 | addi r12, r12, -8 |
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| 182 | subfic r11, r12, 64 |
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| 183 | |
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| 184 | L(nextbyte1): |
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| 185 | ldu r7, 8(r3) /* Load next dw. */ |
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| 186 | addi r12, r12, 8 /* Shift one byte and compare. */ |
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| 187 | addi r11, r11, -8 |
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| 188 | #ifdef __LITTLE_ENDIAN__ |
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| 189 | srd r9, r5, r12 /* Rotate based on mask. */ |
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| 190 | sld r10, r7, r11 |
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| 191 | #else |
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| 192 | sld r9, r5, r12 |
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| 193 | srd r10, r7, r11 |
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| 194 | #endif |
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| 195 | /* Form single dw from few bytes on first load and second load. */ |
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| 196 | or r10, r9, r10 |
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| 197 | /* Check for null in the formed dw. */ |
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| 198 | cmpb r9, r0, r10 |
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| 199 | cmpdi cr7, r9, 0 |
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| 200 | bne cr7, L(retnull) |
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| 201 | /* Cmpb search str and input str. */ |
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| 202 | cmpb r9, r10, r6 |
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| 203 | cmpdi cr7, r9, -1 |
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| 204 | beq cr7, L(match) |
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| 205 | addi r8, r8, 1 |
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| 206 | b L(begin) |
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| 207 | |
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| 208 | .align 4 |
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| 209 | L(match): |
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| 210 | /* There is a match of 8 bytes, check next bytes. */ |
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| 211 | cmpdi cr7, r31, 8 |
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| 212 | beq cr7, L(return) |
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| 213 | /* Update next starting point r8. */ |
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| 214 | srdi r9, r11, 3 |
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| 215 | subf r9, r9, r3 |
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| 216 | mr r8, r9 |
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| 217 | |
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| 218 | L(secondmatch): |
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| 219 | mr r5, r7 |
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| 220 | rlwinm r10, r30, 3, 26, 28 /* Calculate padding in bits. */ |
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| 221 | ld r6, 0(r4) |
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| 222 | addi r4, r4, 8 |
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| 223 | cmpdi cr7, r10, 0 /* Check if its already aligned? */ |
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| 224 | beq cr7, L(proceed3) |
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| 225 | #ifdef __LITTLE_ENDIAN__ |
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| 226 | srd r6, r6, r10 /* Discard unwanted bits. */ |
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| 227 | cmpb r9, r0, r6 |
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| 228 | sld r9, r9, r10 |
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| 229 | #else |
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| 230 | sld r6, r6, r10 |
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| 231 | cmpb r9, r0, r6 |
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| 232 | srd r9, r9, r10 |
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| 233 | #endif |
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| 234 | cmpdi cr7, r9, 0 |
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| 235 | bne cr7, L(proceed3) |
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| 236 | ld r9, 0(r4) |
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| 237 | subfic r10, r10, 64 |
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| 238 | #ifdef __LITTLE_ENDIAN__ |
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| 239 | sld r9, r9, r10 /* Discard unwanted bits. */ |
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| 240 | #else |
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| 241 | srd r9, r9, r10 |
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| 242 | #endif |
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| 243 | or r6, r6, r9 /* Form complete search str. */ |
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| 244 | |
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| 245 | L(proceed3): |
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| 246 | li r7, 0 |
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| 247 | addi r3, r3, 8 |
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| 248 | cmpb r9, r0, r5 |
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| 249 | cmpdi cr7, r9, 0 |
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| 250 | bne cr7, L(proceed4) |
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| 251 | ld r7, 0(r3) |
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| 252 | L(proceed4): |
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| 253 | #ifdef __LITTLE_ENDIAN__ |
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| 254 | srd r9, r5, r12 |
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| 255 | sld r10, r7, r11 |
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| 256 | #else |
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| 257 | sld r9, r5, r12 |
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| 258 | srd r10, r7, r11 |
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| 259 | #endif |
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| 260 | /* Form single dw with few bytes from first and second load. */ |
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| 261 | or r10, r9, r10 |
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| 262 | cmpb r9, r0, r6 |
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| 263 | cmpdi cr7, r9, 0 |
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| 264 | bne cr7, L(return4) |
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| 265 | /* Check for null in the formed dw. */ |
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| 266 | cmpb r9, r0, r10 |
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| 267 | cmpdi cr7, r9, 0 |
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| 268 | bne cr7, L(retnull) |
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| 269 | /* If the next 8 bytes dont match, start search again. */ |
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| 270 | cmpb r9, r10, r6 |
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| 271 | cmpdi cr7, r9, -1 |
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| 272 | bne cr7, L(reset) |
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| 273 | /* If the next 8 bytes match, load and compare next 8. */ |
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| 274 | b L(secondmatch) |
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| 275 | |
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| 276 | .align 4 |
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| 277 | L(reset): |
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| 278 | /* Start the search again. */ |
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| 279 | addi r8, r8, 1 |
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| 280 | b L(begin) |
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| 281 | |
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| 282 | .align 4 |
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| 283 | L(return3): |
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| 284 | /* Count leading zeros and compare partial dw. */ |
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| 285 | #ifdef __LITTLE_ENDIAN__ |
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| 286 | addi r7, r9, -1 |
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| 287 | andc r7, r7, r9 |
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| 288 | popcntd r7, r7 |
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| 289 | subfic r7, r7, 64 |
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| 290 | sld r10, r5, r7 |
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| 291 | sld r6, r6, r7 |
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| 292 | #else |
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| 293 | cntlzd r7, r9 |
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| 294 | subfic r7, r7, 64 |
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| 295 | srd r10, r5, r7 |
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| 296 | srd r6, r6, r7 |
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| 297 | #endif |
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| 298 | cmpb r9, r10, r6 |
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| 299 | cmpdi cr7, r9, -1 |
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| 300 | addi r8, r8, 1 |
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| 301 | /* Start search again if there is no match. */ |
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| 302 | bne cr7, L(begin) |
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| 303 | /* If the words match, update return values. */ |
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| 304 | subfic r7, r7, 64 |
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| 305 | srdi r7, r7, 3 |
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| 306 | add r3, r3, r7 |
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| 307 | subf r3, r31, r3 |
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| 308 | b L(end) |
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| 309 | |
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| 310 | .align 4 |
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| 311 | L(return4): |
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| 312 | /* Count leading zeros and compare partial dw. */ |
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| 313 | #ifdef __LITTLE_ENDIAN__ |
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| 314 | addi r7, r9, -1 |
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| 315 | andc r7, r7, r9 |
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| 316 | popcntd r7, r7 |
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| 317 | subfic r7, r7, 64 |
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| 318 | sld r10, r10, r7 |
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| 319 | sld r6, r6, r7 |
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| 320 | #else |
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| 321 | cntlzd r7, r9 |
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| 322 | subfic r7, r7, 64 |
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| 323 | srd r10, r10, r7 |
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| 324 | srd r6, r6, r7 |
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| 325 | #endif |
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| 326 | cmpb r9, r10, r6 |
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| 327 | cmpdi cr7, r9, -1 |
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| 328 | addi r8, r8, 1 |
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| 329 | bne cr7, L(begin) |
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| 330 | subfic r7, r7, 64 |
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| 331 | srdi r11, r11, 3 |
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| 332 | subf r3, r11, r3 |
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| 333 | srdi r7, r7, 3 |
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| 334 | add r3, r3, r7 |
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| 335 | subf r3, r31, r3 |
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| 336 | b L(end) |
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| 337 | |
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| 338 | .align 4 |
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| 339 | L(begin): |
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| 340 | mr r3, r8 |
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| 341 | /* When our iterations exceed ITERATIONS,fall back to default. */ |
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| 342 | addi r28, r28, 1 |
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| 343 | cmpdi cr7, r28, ITERATIONS |
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| 344 | beq cr7, L(default) |
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| 345 | lbz r4, 0(r30) |
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| 346 | bl STRCHR |
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| 347 | #ifndef STRCHR_is_local |
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| 348 | nop |
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| 349 | #endif |
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| 350 | /* If first char of search str is not present. */ |
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| 351 | cmpdi cr7, r3, 0 |
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| 352 | ble cr7, L(end) |
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| 353 | mr r8, r3 |
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| 354 | mr r4, r30 /* Restore r4. */ |
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| 355 | li r0, 0 |
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| 356 | mr r6, r29 |
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| 357 | clrrdi r4, r4, 3 |
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| 358 | addi r4, r4, 8 |
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| 359 | b L(begin1) |
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| 360 | |
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| 361 | /* Handle less than 8 search string. */ |
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| 362 | .align 4 |
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| 363 | L(lessthan8): |
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| 364 | mr r4, r3 |
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| 365 | mr r9, r30 |
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| 366 | li r0, 0 |
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| 367 | |
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| 368 | rlwinm r10, r9, 3, 26, 28 /* Calculate padding in bits. */ |
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| 369 | srdi r8, r10, 3 /* Padding in bytes. */ |
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| 370 | clrrdi r9, r9, 3 /* Make r4 aligned to 8. */ |
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| 371 | ld r6, 0(r9) |
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| 372 | cmpdi cr7, r10, 0 /* Check if its already aligned? */ |
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| 373 | beq cr7, L(proceed2) |
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| 374 | #ifdef __LITTLE_ENDIAN__ |
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| 375 | srd r6, r6, r10 /* Discard unwanted bits. */ |
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| 376 | #else |
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| 377 | sld r6, r6, r10 |
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| 378 | #endif |
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| 379 | subfic r8, r8, 8 |
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| 380 | cmpd cr7, r8, r31 /* Next load needed? */ |
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| 381 | bge cr7, L(proceed2) |
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| 382 | ld r7, 8(r9) |
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| 383 | subfic r10, r10, 64 |
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| 384 | #ifdef __LITTLE_ENDIAN__ |
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| 385 | sld r7, r7, r10 /* Discard unwanted bits. */ |
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| 386 | #else |
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| 387 | srd r7, r7, r10 |
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| 388 | #endif |
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| 389 | or r6, r6, r7 /* Form complete search str. */ |
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| 390 | L(proceed2): |
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| 391 | mr r29, r6 |
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| 392 | rlwinm r10, r3, 3, 26, 28 |
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| 393 | clrrdi r7, r3, 3 /* Make r3 aligned. */ |
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| 394 | ld r5, 0(r7) |
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| 395 | sldi r8, r31, 3 |
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| 396 | subfic r8, r8, 64 |
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| 397 | #ifdef __LITTLE_ENDIAN__ |
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| 398 | sld r6, r6, r8 |
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| 399 | cmpb r9, r0, r5 |
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| 400 | srd r9, r9, r10 |
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| 401 | #else |
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| 402 | srd r6, r6, r8 |
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| 403 | cmpb r9, r0, r5 |
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| 404 | sld r9, r9, r10 |
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| 405 | #endif |
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| 406 | cmpdi cr7, r9, 0 |
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| 407 | bne cr7, L(noload) |
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| 408 | cmpdi cr7, r10, 0 |
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| 409 | beq cr7, L(continue) |
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| 410 | ld r7, 8(r7) |
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| 411 | L(continue1): |
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| 412 | mr r12, r10 |
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| 413 | addi r12, r12, -8 |
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| 414 | subfic r11, r12, 64 |
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| 415 | b L(nextbyte) |
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| 416 | |
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| 417 | .align 4 |
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| 418 | L(continue): |
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| 419 | ld r7, 8(r7) |
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| 420 | li r12, -8 /* Shift values. */ |
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| 421 | li r11, 72 /* Shift values. */ |
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| 422 | L(nextbyte): |
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| 423 | addi r12, r12, 8 /* Mask for rotation. */ |
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| 424 | addi r11, r11, -8 |
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| 425 | #ifdef __LITTLE_ENDIAN__ |
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| 426 | srd r9, r5, r12 |
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| 427 | sld r10, r7, r11 |
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| 428 | or r10, r9, r10 |
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| 429 | sld r10, r10, r8 |
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| 430 | cmpb r9, r0, r10 |
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| 431 | srd r9, r9, r8 |
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| 432 | #else |
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| 433 | sld r9, r5, r12 |
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| 434 | srd r10, r7, r11 |
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| 435 | or r10, r9, r10 |
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| 436 | srd r10, r10, r8 |
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| 437 | cmpb r9, r0, r10 |
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| 438 | sld r9, r9, r8 |
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| 439 | #endif |
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| 440 | cmpdi cr7, r9, 0 |
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| 441 | bne cr7, L(retnull) |
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| 442 | cmpb r9, r10, r6 |
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| 443 | cmpdi cr7, r9, -1 |
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| 444 | beq cr7, L(end) |
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| 445 | addi r3, r4, 1 |
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| 446 | /* When our iterations exceed ITERATIONS,fall back to default. */ |
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| 447 | addi r28, r28, 1 |
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| 448 | cmpdi cr7, r28, ITERATIONS |
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| 449 | beq cr7, L(default) |
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| 450 | lbz r4, 0(r30) |
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| 451 | bl STRCHR |
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| 452 | #ifndef STRCHR_is_local |
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| 453 | nop |
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| 454 | #endif |
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| 455 | /* If first char of search str is not present. */ |
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| 456 | cmpdi cr7, r3, 0 |
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| 457 | ble cr7, L(end) |
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| 458 | mr r4, r3 |
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| 459 | mr r6, r29 |
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| 460 | li r0, 0 |
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| 461 | b L(proceed2) |
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| 462 | |
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| 463 | .align 4 |
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| 464 | L(noload): |
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| 465 | /* Reached null in r3, so skip next load. */ |
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| 466 | li r7, 0 |
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| 467 | b L(continue1) |
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| 468 | |
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| 469 | .align 4 |
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| 470 | L(return): |
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| 471 | /* Update return values. */ |
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| 472 | srdi r9, r11, 3 |
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| 473 | subf r3, r9, r3 |
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| 474 | b L(end) |
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| 475 | |
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| 476 | /* Handling byte by byte. */ |
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| 477 | .align 4 |
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| 478 | L(bytebybyte): |
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| 479 | mr r8, r3 |
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| 480 | addi r8, r8, -1 |
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| 481 | L(loop1): |
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| 482 | addi r8, r8, 1 |
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| 483 | mr r3, r8 |
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| 484 | mr r4, r30 |
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| 485 | lbz r6, 0(r4) |
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| 486 | cmpdi cr7, r6, 0 |
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| 487 | beq cr7, L(updater3) |
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| 488 | L(loop): |
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| 489 | lbz r5, 0(r3) |
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| 490 | cmpdi cr7, r5, 0 |
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| 491 | beq cr7, L(retnull) |
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| 492 | cmpld cr7, r6, r5 |
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| 493 | bne cr7, L(loop1) |
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| 494 | addi r3, r3, 1 |
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| 495 | addi r4, r4, 1 |
|---|
| 496 | lbz r6, 0(r4) |
|---|
| 497 | cmpdi cr7, r6, 0 |
|---|
| 498 | beq cr7, L(updater3) |
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| 499 | b L(loop) |
|---|
| 500 | |
|---|
| 501 | /* Handling return values. */ |
|---|
| 502 | .align 4 |
|---|
| 503 | L(updater3): |
|---|
| 504 | subf r3, r31, r3 /* Reduce len of r4 from r3. */ |
|---|
| 505 | b L(end) |
|---|
| 506 | |
|---|
| 507 | .align 4 |
|---|
| 508 | L(ret_r3): |
|---|
| 509 | mr r3, r29 /* Return r3. */ |
|---|
| 510 | b L(end) |
|---|
| 511 | |
|---|
| 512 | .align 4 |
|---|
| 513 | L(retnull): |
|---|
| 514 | li r3, 0 /* Return NULL. */ |
|---|
| 515 | b L(end) |
|---|
| 516 | |
|---|
| 517 | .align 4 |
|---|
| 518 | L(default): |
|---|
| 519 | mr r4, r30 |
|---|
| 520 | bl __strstr_ppc |
|---|
| 521 | nop |
|---|
| 522 | |
|---|
| 523 | .align 4 |
|---|
| 524 | L(end): |
|---|
| 525 | addi r1, r1, FRAMESIZE /* Restore stack pointer. */ |
|---|
| 526 | cfi_adjust_cfa_offset(-FRAMESIZE) |
|---|
| 527 | ld r0, 16(r1) /* Restore the saved link register. */ |
|---|
| 528 | ld r28, -32(r1) /* Restore callers save register r28. */ |
|---|
| 529 | ld r29, -24(r1) /* Restore callers save register r29. */ |
|---|
| 530 | ld r30, -16(r1) /* Restore callers save register r30. */ |
|---|
| 531 | ld r31, -8(r1) /* Restore callers save register r31. */ |
|---|
| 532 | mtlr r0 /* Branch to link register. */ |
|---|
| 533 | blr |
|---|
| 534 | END (STRSTR) |
|---|
| 535 | libc_hidden_builtin_def (strstr) |
|---|
| 536 | |
|---|
