| 1 | /* Optimized memmove implementation for PowerPC64/POWER7. |
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| 2 | Copyright (C) 2014-2024 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 | |
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| 22 | /* void* [r3] memmove (void *dest [r3], const void *src [r4], size_t len [r5]) |
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| 23 | |
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| 24 | This optimization check if memory 'dest' overlaps with 'src'. If it does |
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| 25 | not then it calls an optimized memcpy call (similar to memcpy for POWER7, |
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| 26 | embedded here to gain some cycles). |
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| 27 | If source and destiny overlaps, a optimized backwards memcpy is used |
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| 28 | instead. */ |
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| 29 | |
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| 30 | #ifndef MEMMOVE |
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| 31 | # define MEMMOVE memmove |
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| 32 | #endif |
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| 33 | .machine power7 |
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| 34 | ENTRY_TOCLESS (MEMMOVE, 5) |
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| 35 | CALL_MCOUNT 3 |
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| 36 | |
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| 37 | L(_memmove): |
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| 38 | subf r9,r4,r3 |
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| 39 | cmpld cr7,r9,r5 |
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| 40 | blt cr7,L(memmove_bwd) |
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| 41 | |
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| 42 | cmpldi cr1,r5,31 |
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| 43 | neg 0,3 |
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| 44 | ble cr1, L(copy_LT_32) /* If move < 32 bytes use short move |
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| 45 | code. */ |
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| 46 | |
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| 47 | andi. 10,3,15 |
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| 48 | clrldi 11,4,60 |
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| 49 | cmpld cr6,10,11 /* SRC and DST alignments match? */ |
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| 50 | |
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| 51 | mr r11,3 |
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| 52 | bne cr6,L(copy_GE_32_unaligned) |
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| 53 | beq L(aligned_copy) |
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| 54 | |
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| 55 | mtocrf 0x01,0 |
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| 56 | clrldi 0,0,60 |
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| 57 | |
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| 58 | /* Get the DST and SRC aligned to 8 bytes (16 for little-endian). */ |
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| 59 | 1: |
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| 60 | bf 31,2f |
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| 61 | lbz 6,0(r4) |
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| 62 | addi r4,r4,1 |
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| 63 | stb 6,0(r11) |
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| 64 | addi r11,r11,1 |
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| 65 | 2: |
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| 66 | bf 30,4f |
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| 67 | lhz 6,0(r4) |
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| 68 | addi r4,r4,2 |
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| 69 | sth 6,0(r11) |
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| 70 | addi r11,r11,2 |
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| 71 | 4: |
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| 72 | bf 29,8f |
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| 73 | lwz 6,0(r4) |
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| 74 | addi r4,r4,4 |
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| 75 | stw 6,0(r11) |
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| 76 | addi r11,r11,4 |
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| 77 | 8: |
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| 78 | bf 28,16f |
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| 79 | ld 6,0(r4) |
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| 80 | addi r4,r4,8 |
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| 81 | std 6,0(r11) |
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| 82 | addi r11,r11,8 |
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| 83 | 16: |
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| 84 | subf r5,0,r5 |
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| 85 | |
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| 86 | /* Main aligned copy loop. Copies 128 bytes at a time. */ |
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| 87 | L(aligned_copy): |
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| 88 | li 6,16 |
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| 89 | li 7,32 |
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| 90 | li 8,48 |
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| 91 | mtocrf 0x02,r5 |
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| 92 | srdi 12,r5,7 |
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| 93 | cmpdi 12,0 |
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| 94 | beq L(aligned_tail) |
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| 95 | lvx 6,0,r4 |
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| 96 | lvx 7,r4,6 |
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| 97 | mtctr 12 |
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| 98 | b L(aligned_128loop) |
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| 99 | |
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| 100 | .align 4 |
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| 101 | L(aligned_128head): |
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| 102 | /* for the 2nd + iteration of this loop. */ |
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| 103 | lvx 6,0,r4 |
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| 104 | lvx 7,r4,6 |
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| 105 | L(aligned_128loop): |
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| 106 | lvx 8,r4,7 |
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| 107 | lvx 9,r4,8 |
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| 108 | stvx 6,0,r11 |
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| 109 | addi r4,r4,64 |
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| 110 | stvx 7,r11,6 |
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| 111 | stvx 8,r11,7 |
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| 112 | stvx 9,r11,8 |
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| 113 | lvx 6,0,r4 |
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| 114 | lvx 7,r4,6 |
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| 115 | addi r11,r11,64 |
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| 116 | lvx 8,r4,7 |
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| 117 | lvx 9,r4,8 |
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| 118 | addi r4,r4,64 |
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| 119 | stvx 6,0,r11 |
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| 120 | stvx 7,r11,6 |
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| 121 | stvx 8,r11,7 |
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| 122 | stvx 9,r11,8 |
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| 123 | addi r11,r11,64 |
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| 124 | bdnz L(aligned_128head) |
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| 125 | |
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| 126 | L(aligned_tail): |
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| 127 | mtocrf 0x01,r5 |
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| 128 | bf 25,32f |
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| 129 | lvx 6,0,r4 |
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| 130 | lvx 7,r4,6 |
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| 131 | lvx 8,r4,7 |
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| 132 | lvx 9,r4,8 |
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| 133 | addi r4,r4,64 |
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| 134 | stvx 6,0,r11 |
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| 135 | stvx 7,r11,6 |
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| 136 | stvx 8,r11,7 |
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| 137 | stvx 9,r11,8 |
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| 138 | addi r11,r11,64 |
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| 139 | 32: |
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| 140 | bf 26,16f |
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| 141 | lvx 6,0,r4 |
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| 142 | lvx 7,r4,6 |
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| 143 | addi r4,r4,32 |
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| 144 | stvx 6,0,r11 |
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| 145 | stvx 7,r11,6 |
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| 146 | addi r11,r11,32 |
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| 147 | 16: |
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| 148 | bf 27,8f |
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| 149 | lvx 6,0,r4 |
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| 150 | addi r4,r4,16 |
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| 151 | stvx 6,0,r11 |
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| 152 | addi r11,r11,16 |
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| 153 | 8: |
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| 154 | bf 28,4f |
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| 155 | ld 6,0(r4) |
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| 156 | addi r4,r4,8 |
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| 157 | std 6,0(r11) |
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| 158 | addi r11,r11,8 |
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| 159 | 4: /* Copies 4~7 bytes. */ |
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| 160 | bf 29,L(tail2) |
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| 161 | lwz 6,0(r4) |
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| 162 | stw 6,0(r11) |
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| 163 | bf 30,L(tail5) |
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| 164 | lhz 7,4(r4) |
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| 165 | sth 7,4(r11) |
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| 166 | bflr 31 |
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| 167 | lbz 8,6(r4) |
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| 168 | stb 8,6(r11) |
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| 169 | /* Return original DST pointer. */ |
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| 170 | blr |
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| 171 | |
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| 172 | /* Handle copies of 0~31 bytes. */ |
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| 173 | .align 4 |
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| 174 | L(copy_LT_32): |
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| 175 | mr r11,3 |
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| 176 | cmpldi cr6,r5,8 |
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| 177 | mtocrf 0x01,r5 |
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| 178 | ble cr6,L(copy_LE_8) |
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| 179 | |
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| 180 | /* At least 9 bytes to go. */ |
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| 181 | neg 8,4 |
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| 182 | andi. 0,8,3 |
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| 183 | cmpldi cr1,r5,16 |
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| 184 | beq L(copy_LT_32_aligned) |
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| 185 | |
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| 186 | /* Force 4-byte alignment for SRC. */ |
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| 187 | mtocrf 0x01,0 |
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| 188 | subf r5,0,r5 |
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| 189 | 2: |
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| 190 | bf 30,1f |
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| 191 | lhz 6,0(r4) |
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| 192 | addi r4,r4,2 |
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| 193 | sth 6,0(r11) |
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| 194 | addi r11,r11,2 |
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| 195 | 1: |
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| 196 | bf 31,L(end_4bytes_alignment) |
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| 197 | lbz 6,0(r4) |
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| 198 | addi r4,r4,1 |
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| 199 | stb 6,0(r11) |
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| 200 | addi r11,r11,1 |
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| 201 | |
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| 202 | .align 4 |
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| 203 | L(end_4bytes_alignment): |
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| 204 | cmpldi cr1,r5,16 |
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| 205 | mtocrf 0x01,r5 |
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| 206 | |
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| 207 | L(copy_LT_32_aligned): |
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| 208 | /* At least 6 bytes to go, and SRC is word-aligned. */ |
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| 209 | blt cr1,8f |
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| 210 | |
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| 211 | /* Copy 16 bytes. */ |
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| 212 | lwz 6,0(r4) |
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| 213 | lwz 7,4(r4) |
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| 214 | stw 6,0(r11) |
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| 215 | lwz 8,8(r4) |
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| 216 | stw 7,4(r11) |
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| 217 | lwz 6,12(r4) |
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| 218 | addi r4,r4,16 |
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| 219 | stw 8,8(r11) |
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| 220 | stw 6,12(r11) |
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| 221 | addi r11,r11,16 |
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| 222 | 8: /* Copy 8 bytes. */ |
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| 223 | bf 28,L(tail4) |
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| 224 | lwz 6,0(r4) |
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| 225 | lwz 7,4(r4) |
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| 226 | addi r4,r4,8 |
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| 227 | stw 6,0(r11) |
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| 228 | stw 7,4(r11) |
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| 229 | addi r11,r11,8 |
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| 230 | |
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| 231 | .align 4 |
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| 232 | /* Copies 4~7 bytes. */ |
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| 233 | L(tail4): |
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| 234 | bf 29,L(tail2) |
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| 235 | lwz 6,0(r4) |
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| 236 | stw 6,0(r11) |
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| 237 | bf 30,L(tail5) |
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| 238 | lhz 7,4(r4) |
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| 239 | sth 7,4(r11) |
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| 240 | bflr 31 |
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| 241 | lbz 8,6(r4) |
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| 242 | stb 8,6(r11) |
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| 243 | /* Return original DST pointer. */ |
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| 244 | blr |
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| 245 | |
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| 246 | .align 4 |
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| 247 | /* Copies 2~3 bytes. */ |
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| 248 | L(tail2): |
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| 249 | bf 30,1f |
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| 250 | lhz 6,0(r4) |
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| 251 | sth 6,0(r11) |
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| 252 | bflr 31 |
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| 253 | lbz 7,2(r4) |
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| 254 | stb 7,2(r11) |
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| 255 | blr |
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| 256 | |
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| 257 | .align 4 |
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| 258 | L(tail5): |
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| 259 | bflr 31 |
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| 260 | lbz 6,4(r4) |
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| 261 | stb 6,4(r11) |
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| 262 | blr |
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| 263 | |
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| 264 | .align 4 |
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| 265 | 1: |
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| 266 | bflr 31 |
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| 267 | lbz 6,0(r4) |
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| 268 | stb 6,0(r11) |
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| 269 | /* Return original DST pointer. */ |
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| 270 | blr |
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| 271 | |
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| 272 | /* Handles copies of 0~8 bytes. */ |
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| 273 | .align 4 |
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| 274 | L(copy_LE_8): |
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| 275 | bne cr6,L(tail4) |
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| 276 | |
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| 277 | /* Though we could've used ld/std here, they are still |
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| 278 | slow for unaligned cases. */ |
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| 279 | |
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| 280 | lwz 6,0(r4) |
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| 281 | lwz 7,4(r4) |
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| 282 | stw 6,0(r11) |
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| 283 | stw 7,4(r11) |
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| 284 | blr |
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| 285 | |
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| 286 | |
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| 287 | /* Handle copies of 32+ bytes where DST is aligned (to quadword) but |
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| 288 | SRC is not. Use aligned quadword loads from SRC, shifted to realign |
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| 289 | the data, allowing for aligned DST stores. */ |
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| 290 | .align 4 |
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| 291 | L(copy_GE_32_unaligned): |
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| 292 | clrldi 0,0,60 /* Number of bytes until the 1st r11 quadword. */ |
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| 293 | srdi 9,r5,4 /* Number of full quadwords remaining. */ |
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| 294 | |
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| 295 | beq L(copy_GE_32_unaligned_cont) |
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| 296 | |
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| 297 | /* DST is not quadword aligned, get it aligned. */ |
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| 298 | |
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| 299 | mtocrf 0x01,0 |
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| 300 | subf r5,0,r5 |
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| 301 | |
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| 302 | /* Vector instructions work best when proper alignment (16-bytes) |
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| 303 | is present. Move 0~15 bytes as needed to get DST quadword-aligned. */ |
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| 304 | 1: |
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| 305 | bf 31,2f |
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| 306 | lbz 6,0(r4) |
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| 307 | addi r4,r4,1 |
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| 308 | stb 6,0(r11) |
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| 309 | addi r11,r11,1 |
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| 310 | 2: |
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| 311 | bf 30,4f |
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| 312 | lhz 6,0(r4) |
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| 313 | addi r4,r4,2 |
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| 314 | sth 6,0(r11) |
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| 315 | addi r11,r11,2 |
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| 316 | 4: |
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| 317 | bf 29,8f |
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| 318 | lwz 6,0(r4) |
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| 319 | addi r4,r4,4 |
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| 320 | stw 6,0(r11) |
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| 321 | addi r11,r11,4 |
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| 322 | 8: |
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| 323 | bf 28,0f |
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| 324 | ld 6,0(r4) |
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| 325 | addi r4,r4,8 |
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| 326 | std 6,0(r11) |
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| 327 | addi r11,r11,8 |
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| 328 | 0: |
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| 329 | srdi 9,r5,4 /* Number of full quadwords remaining. */ |
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| 330 | |
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| 331 | /* The proper alignment is present, it is OK to copy the bytes now. */ |
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| 332 | L(copy_GE_32_unaligned_cont): |
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| 333 | |
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| 334 | /* Setup two indexes to speed up the indexed vector operations. */ |
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| 335 | clrldi 10,r5,60 |
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| 336 | li 6,16 /* Index for 16-bytes offsets. */ |
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| 337 | li 7,32 /* Index for 32-bytes offsets. */ |
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| 338 | cmpldi cr1,10,0 |
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| 339 | srdi 8,r5,5 /* Setup the loop counter. */ |
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| 340 | mtocrf 0x01,9 |
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| 341 | cmpldi cr6,9,1 |
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| 342 | #ifdef __LITTLE_ENDIAN__ |
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| 343 | lvsr 5,0,r4 |
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| 344 | #else |
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| 345 | lvsl 5,0,r4 |
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| 346 | #endif |
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| 347 | lvx 3,0,r4 |
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| 348 | li 0,0 |
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| 349 | bf 31,L(setup_unaligned_loop) |
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| 350 | |
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| 351 | /* Copy another 16 bytes to align to 32-bytes due to the loop. */ |
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| 352 | lvx 4,r4,6 |
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| 353 | #ifdef __LITTLE_ENDIAN__ |
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| 354 | vperm 6,4,3,5 |
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| 355 | #else |
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| 356 | vperm 6,3,4,5 |
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| 357 | #endif |
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| 358 | addi r4,r4,16 |
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| 359 | stvx 6,0,r11 |
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| 360 | addi r11,r11,16 |
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| 361 | vor 3,4,4 |
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| 362 | clrrdi 0,r4,60 |
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| 363 | |
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| 364 | L(setup_unaligned_loop): |
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| 365 | mtctr 8 |
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| 366 | ble cr6,L(end_unaligned_loop) |
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| 367 | |
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| 368 | /* Copy 32 bytes at a time using vector instructions. */ |
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| 369 | .align 4 |
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| 370 | L(unaligned_loop): |
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| 371 | |
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| 372 | /* Note: vr6/vr10 may contain data that was already copied, |
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| 373 | but in order to get proper alignment, we may have to copy |
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| 374 | some portions again. This is faster than having unaligned |
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| 375 | vector instructions though. */ |
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| 376 | |
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| 377 | lvx 4,r4,6 |
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| 378 | #ifdef __LITTLE_ENDIAN__ |
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| 379 | vperm 6,4,3,5 |
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| 380 | #else |
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| 381 | vperm 6,3,4,5 |
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| 382 | #endif |
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| 383 | lvx 3,r4,7 |
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| 384 | #ifdef __LITTLE_ENDIAN__ |
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| 385 | vperm 10,3,4,5 |
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| 386 | #else |
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| 387 | vperm 10,4,3,5 |
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| 388 | #endif |
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| 389 | addi r4,r4,32 |
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| 390 | stvx 6,0,r11 |
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| 391 | stvx 10,r11,6 |
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| 392 | addi r11,r11,32 |
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| 393 | bdnz L(unaligned_loop) |
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| 394 | |
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| 395 | clrrdi 0,r4,60 |
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| 396 | |
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| 397 | .align 4 |
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| 398 | L(end_unaligned_loop): |
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| 399 | |
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| 400 | /* Check for tail bytes. */ |
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| 401 | mtocrf 0x01,r5 |
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| 402 | beqlr cr1 |
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| 403 | |
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| 404 | add r4,r4,0 |
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| 405 | |
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| 406 | /* We have 1~15 tail bytes to copy, and DST is quadword aligned. */ |
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| 407 | /* Copy 8 bytes. */ |
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| 408 | bf 28,4f |
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| 409 | lwz 6,0(r4) |
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| 410 | lwz 7,4(r4) |
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| 411 | addi r4,r4,8 |
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| 412 | stw 6,0(r11) |
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| 413 | stw 7,4(r11) |
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| 414 | addi r11,r11,8 |
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| 415 | 4: /* Copy 4~7 bytes. */ |
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| 416 | bf 29,L(tail2) |
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| 417 | lwz 6,0(r4) |
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| 418 | stw 6,0(r11) |
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| 419 | bf 30,L(tail5) |
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| 420 | lhz 7,4(r4) |
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| 421 | sth 7,4(r11) |
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| 422 | bflr 31 |
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| 423 | lbz 8,6(r4) |
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| 424 | stb 8,6(r11) |
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| 425 | /* Return original DST pointer. */ |
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| 426 | blr |
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| 427 | |
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| 428 | /* Start to memcpy backward implementation: the algorithm first check if |
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| 429 | src and dest have the same alignment and if it does align both to 16 |
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| 430 | bytes and copy using VSX instructions. |
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| 431 | If does not, align dest to 16 bytes and use VMX (altivec) instruction |
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| 432 | to read two 16 bytes at time, shift/permute the bytes read and write |
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| 433 | aligned to dest. */ |
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| 434 | L(memmove_bwd): |
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| 435 | cmpldi cr1,r5,31 |
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| 436 | /* Copy is done backwards: update the pointers and check alignment. */ |
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| 437 | add r11,r3,r5 |
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| 438 | add r4,r4,r5 |
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| 439 | mr r0,r11 |
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| 440 | ble cr1, L(copy_LT_32_bwd) /* If move < 32 bytes use short move |
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| 441 | code. */ |
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| 442 | |
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| 443 | andi. r10,r11,15 /* Check if r11 is aligned to 16 bytes */ |
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| 444 | clrldi r9,r4,60 /* Check if r4 is aligned to 16 bytes */ |
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| 445 | cmpld cr6,r10,r9 /* SRC and DST alignments match? */ |
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| 446 | |
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| 447 | bne cr6,L(copy_GE_32_unaligned_bwd) |
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| 448 | beq L(aligned_copy_bwd) |
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| 449 | |
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| 450 | mtocrf 0x01,r0 |
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| 451 | clrldi r0,r0,60 |
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| 452 | |
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| 453 | /* Get the DST and SRC aligned to 16 bytes. */ |
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| 454 | 1: |
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| 455 | bf 31,2f |
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| 456 | lbz r6,-1(r4) |
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| 457 | subi r4,r4,1 |
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| 458 | stb r6,-1(r11) |
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| 459 | subi r11,r11,1 |
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| 460 | 2: |
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| 461 | bf 30,4f |
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| 462 | lhz r6,-2(r4) |
|---|
| 463 | subi r4,r4,2 |
|---|
| 464 | sth r6,-2(r11) |
|---|
| 465 | subi r11,r11,2 |
|---|
| 466 | 4: |
|---|
| 467 | bf 29,8f |
|---|
| 468 | lwz r6,-4(r4) |
|---|
| 469 | subi r4,r4,4 |
|---|
| 470 | stw r6,-4(r11) |
|---|
| 471 | subi r11,r11,4 |
|---|
| 472 | 8: |
|---|
| 473 | bf 28,16f |
|---|
| 474 | ld r6,-8(r4) |
|---|
| 475 | subi r4,r4,8 |
|---|
| 476 | std r6,-8(r11) |
|---|
| 477 | subi r11,r11,8 |
|---|
| 478 | 16: |
|---|
| 479 | subf r5,0,r5 |
|---|
| 480 | |
|---|
| 481 | /* Main aligned copy loop. Copies 128 bytes at a time. */ |
|---|
| 482 | L(aligned_copy_bwd): |
|---|
| 483 | li r6,-16 |
|---|
| 484 | li r7,-32 |
|---|
| 485 | li r8,-48 |
|---|
| 486 | li r9,-64 |
|---|
| 487 | mtocrf 0x02,r5 |
|---|
| 488 | srdi r12,r5,7 |
|---|
| 489 | cmpdi r12,0 |
|---|
| 490 | beq L(aligned_tail_bwd) |
|---|
| 491 | lvx v6,r4,r6 |
|---|
| 492 | lvx v7,r4,r7 |
|---|
| 493 | mtctr 12 |
|---|
| 494 | b L(aligned_128loop_bwd) |
|---|
| 495 | |
|---|
| 496 | .align 4 |
|---|
| 497 | L(aligned_128head_bwd): |
|---|
| 498 | /* for the 2nd + iteration of this loop. */ |
|---|
| 499 | lvx v6,r4,r6 |
|---|
| 500 | lvx v7,r4,r7 |
|---|
| 501 | L(aligned_128loop_bwd): |
|---|
| 502 | lvx v8,r4,r8 |
|---|
| 503 | lvx v9,r4,r9 |
|---|
| 504 | stvx v6,r11,r6 |
|---|
| 505 | subi r4,r4,64 |
|---|
| 506 | stvx v7,r11,r7 |
|---|
| 507 | stvx v8,r11,r8 |
|---|
| 508 | stvx v9,r11,r9 |
|---|
| 509 | lvx v6,r4,r6 |
|---|
| 510 | lvx v7,r4,7 |
|---|
| 511 | subi r11,r11,64 |
|---|
| 512 | lvx v8,r4,r8 |
|---|
| 513 | lvx v9,r4,r9 |
|---|
| 514 | subi r4,r4,64 |
|---|
| 515 | stvx v6,r11,r6 |
|---|
| 516 | stvx v7,r11,r7 |
|---|
| 517 | stvx v8,r11,r8 |
|---|
| 518 | stvx v9,r11,r9 |
|---|
| 519 | subi r11,r11,64 |
|---|
| 520 | bdnz L(aligned_128head_bwd) |
|---|
| 521 | |
|---|
| 522 | L(aligned_tail_bwd): |
|---|
| 523 | mtocrf 0x01,r5 |
|---|
| 524 | bf 25,32f |
|---|
| 525 | lvx v6,r4,r6 |
|---|
| 526 | lvx v7,r4,r7 |
|---|
| 527 | lvx v8,r4,r8 |
|---|
| 528 | lvx v9,r4,r9 |
|---|
| 529 | subi r4,r4,64 |
|---|
| 530 | stvx v6,r11,r6 |
|---|
| 531 | stvx v7,r11,r7 |
|---|
| 532 | stvx v8,r11,r8 |
|---|
| 533 | stvx v9,r11,r9 |
|---|
| 534 | subi r11,r11,64 |
|---|
| 535 | 32: |
|---|
| 536 | bf 26,16f |
|---|
| 537 | lvx v6,r4,r6 |
|---|
| 538 | lvx v7,r4,r7 |
|---|
| 539 | subi r4,r4,32 |
|---|
| 540 | stvx v6,r11,r6 |
|---|
| 541 | stvx v7,r11,r7 |
|---|
| 542 | subi r11,r11,32 |
|---|
| 543 | 16: |
|---|
| 544 | bf 27,8f |
|---|
| 545 | lvx v6,r4,r6 |
|---|
| 546 | subi r4,r4,16 |
|---|
| 547 | stvx v6,r11,r6 |
|---|
| 548 | subi r11,r11,16 |
|---|
| 549 | 8: |
|---|
| 550 | bf 28,4f |
|---|
| 551 | ld r6,-8(r4) |
|---|
| 552 | subi r4,r4,8 |
|---|
| 553 | std r6,-8(r11) |
|---|
| 554 | subi r11,r11,8 |
|---|
| 555 | 4: /* Copies 4~7 bytes. */ |
|---|
| 556 | bf 29,L(tail2_bwd) |
|---|
| 557 | lwz r6,-4(r4) |
|---|
| 558 | stw r6,-4(r11) |
|---|
| 559 | bf 30,L(tail5_bwd) |
|---|
| 560 | lhz r7,-6(r4) |
|---|
| 561 | sth r7,-6(r11) |
|---|
| 562 | bflr 31 |
|---|
| 563 | lbz r8,-7(r4) |
|---|
| 564 | stb r8,-7(r11) |
|---|
| 565 | /* Return original DST pointer. */ |
|---|
| 566 | blr |
|---|
| 567 | |
|---|
| 568 | /* Handle copies of 0~31 bytes. */ |
|---|
| 569 | .align 4 |
|---|
| 570 | L(copy_LT_32_bwd): |
|---|
| 571 | cmpldi cr6,r5,8 |
|---|
| 572 | mtocrf 0x01,r5 |
|---|
| 573 | ble cr6,L(copy_LE_8_bwd) |
|---|
| 574 | |
|---|
| 575 | /* At least 9 bytes to go. */ |
|---|
| 576 | neg r8,r4 |
|---|
| 577 | andi. r0,r8,3 |
|---|
| 578 | cmpldi cr1,r5,16 |
|---|
| 579 | beq L(copy_LT_32_aligned_bwd) |
|---|
| 580 | |
|---|
| 581 | /* Force 4-byte alignment for SRC. */ |
|---|
| 582 | mtocrf 0x01,0 |
|---|
| 583 | subf r5,0,r5 |
|---|
| 584 | 2: |
|---|
| 585 | bf 30,1f |
|---|
| 586 | lhz r6,-2(r4) |
|---|
| 587 | subi r4,r4,2 |
|---|
| 588 | sth r6,-2(r11) |
|---|
| 589 | subi r11,r11,2 |
|---|
| 590 | 1: |
|---|
| 591 | bf 31,L(end_4bytes_alignment_bwd) |
|---|
| 592 | lbz 6,-1(r4) |
|---|
| 593 | subi r4,r4,1 |
|---|
| 594 | stb 6,-1(r11) |
|---|
| 595 | subi r11,r11,1 |
|---|
| 596 | |
|---|
| 597 | .align 4 |
|---|
| 598 | L(end_4bytes_alignment_bwd): |
|---|
| 599 | cmpldi cr1,r5,16 |
|---|
| 600 | mtocrf 0x01,r5 |
|---|
| 601 | |
|---|
| 602 | L(copy_LT_32_aligned_bwd): |
|---|
| 603 | /* At least 6 bytes to go, and SRC is word-aligned. */ |
|---|
| 604 | blt cr1,8f |
|---|
| 605 | |
|---|
| 606 | /* Copy 16 bytes. */ |
|---|
| 607 | lwz r6,-4(r4) |
|---|
| 608 | lwz r7,-8(r4) |
|---|
| 609 | stw r6,-4(r11) |
|---|
| 610 | lwz r8,-12(r4) |
|---|
| 611 | stw r7,-8(r11) |
|---|
| 612 | lwz r6,-16(r4) |
|---|
| 613 | subi r4,r4,16 |
|---|
| 614 | stw r8,-12(r11) |
|---|
| 615 | stw r6,-16(r11) |
|---|
| 616 | subi r11,r11,16 |
|---|
| 617 | 8: /* Copy 8 bytes. */ |
|---|
| 618 | bf 28,L(tail4_bwd) |
|---|
| 619 | lwz r6,-4(r4) |
|---|
| 620 | lwz r7,-8(r4) |
|---|
| 621 | subi r4,r4,8 |
|---|
| 622 | stw r6,-4(r11) |
|---|
| 623 | stw r7,-8(r11) |
|---|
| 624 | subi r11,r11,8 |
|---|
| 625 | |
|---|
| 626 | .align 4 |
|---|
| 627 | /* Copies 4~7 bytes. */ |
|---|
| 628 | L(tail4_bwd): |
|---|
| 629 | bf 29,L(tail2_bwd) |
|---|
| 630 | lwz 6,-4(r4) |
|---|
| 631 | stw 6,-4(r11) |
|---|
| 632 | bf 30,L(tail5_bwd) |
|---|
| 633 | lhz 7,-6(r4) |
|---|
| 634 | sth 7,-6(r11) |
|---|
| 635 | bflr 31 |
|---|
| 636 | lbz 8,-7(r4) |
|---|
| 637 | stb 8,-7(r11) |
|---|
| 638 | /* Return original DST pointer. */ |
|---|
| 639 | blr |
|---|
| 640 | |
|---|
| 641 | .align 4 |
|---|
| 642 | /* Copies 2~3 bytes. */ |
|---|
| 643 | L(tail2_bwd): |
|---|
| 644 | bf 30,1f |
|---|
| 645 | lhz 6,-2(r4) |
|---|
| 646 | sth 6,-2(r11) |
|---|
| 647 | bflr 31 |
|---|
| 648 | lbz 7,-3(r4) |
|---|
| 649 | stb 7,-3(r11) |
|---|
| 650 | blr |
|---|
| 651 | |
|---|
| 652 | .align 4 |
|---|
| 653 | L(tail5_bwd): |
|---|
| 654 | bflr 31 |
|---|
| 655 | lbz 6,-5(r4) |
|---|
| 656 | stb 6,-5(r11) |
|---|
| 657 | blr |
|---|
| 658 | |
|---|
| 659 | .align 4 |
|---|
| 660 | 1: |
|---|
| 661 | bflr 31 |
|---|
| 662 | lbz 6,-1(r4) |
|---|
| 663 | stb 6,-1(r11) |
|---|
| 664 | /* Return original DST pointer. */ |
|---|
| 665 | blr |
|---|
| 666 | |
|---|
| 667 | |
|---|
| 668 | /* Handles copies of 0~8 bytes. */ |
|---|
| 669 | .align 4 |
|---|
| 670 | L(copy_LE_8_bwd): |
|---|
| 671 | bne cr6,L(tail4_bwd) |
|---|
| 672 | |
|---|
| 673 | /* Though we could've used ld/std here, they are still |
|---|
| 674 | slow for unaligned cases. */ |
|---|
| 675 | lwz 6,-8(r4) |
|---|
| 676 | lwz 7,-4(r4) |
|---|
| 677 | stw 6,-8(r11) |
|---|
| 678 | stw 7,-4(r11) |
|---|
| 679 | blr |
|---|
| 680 | |
|---|
| 681 | |
|---|
| 682 | /* Handle copies of 32+ bytes where DST is aligned (to quadword) but |
|---|
| 683 | SRC is not. Use aligned quadword loads from SRC, shifted to realign |
|---|
| 684 | the data, allowing for aligned DST stores. */ |
|---|
| 685 | .align 4 |
|---|
| 686 | L(copy_GE_32_unaligned_bwd): |
|---|
| 687 | andi. r10,r11,15 /* Check alignment of DST against 16 bytes.. */ |
|---|
| 688 | srdi r9,r5,4 /* Number of full quadwords remaining. */ |
|---|
| 689 | |
|---|
| 690 | beq L(copy_GE_32_unaligned_cont_bwd) |
|---|
| 691 | |
|---|
| 692 | /* DST is not quadword aligned and r10 holds the address masked to |
|---|
| 693 | compare alignments. */ |
|---|
| 694 | mtocrf 0x01,r10 |
|---|
| 695 | subf r5,r10,r5 |
|---|
| 696 | |
|---|
| 697 | /* Vector instructions work best when proper alignment (16-bytes) |
|---|
| 698 | is present. Move 0~15 bytes as needed to get DST quadword-aligned. */ |
|---|
| 699 | 1: |
|---|
| 700 | bf 31,2f |
|---|
| 701 | lbz r6,-1(r4) |
|---|
| 702 | subi r4,r4,1 |
|---|
| 703 | stb r6,-1(r11) |
|---|
| 704 | subi r11,r11,1 |
|---|
| 705 | 2: |
|---|
| 706 | bf 30,4f |
|---|
| 707 | lhz r6,-2(r4) |
|---|
| 708 | subi r4,r4,2 |
|---|
| 709 | sth r6,-2(r11) |
|---|
| 710 | subi r11,r11,2 |
|---|
| 711 | 4: |
|---|
| 712 | bf 29,8f |
|---|
| 713 | lwz r6,-4(r4) |
|---|
| 714 | subi r4,r4,4 |
|---|
| 715 | stw r6,-4(r11) |
|---|
| 716 | subi r11,r11,4 |
|---|
| 717 | 8: |
|---|
| 718 | bf 28,0f |
|---|
| 719 | ld r6,-8(r4) |
|---|
| 720 | subi r4,r4,8 |
|---|
| 721 | std r6,-8(r11) |
|---|
| 722 | subi r11,r11,8 |
|---|
| 723 | 0: |
|---|
| 724 | srdi r9,r5,4 /* Number of full quadwords remaining. */ |
|---|
| 725 | |
|---|
| 726 | /* The proper alignment is present, it is OK to copy the bytes now. */ |
|---|
| 727 | L(copy_GE_32_unaligned_cont_bwd): |
|---|
| 728 | |
|---|
| 729 | /* Setup two indexes to speed up the indexed vector operations. */ |
|---|
| 730 | clrldi r10,r5,60 |
|---|
| 731 | li r6,-16 /* Index for 16-bytes offsets. */ |
|---|
| 732 | li r7,-32 /* Index for 32-bytes offsets. */ |
|---|
| 733 | cmpldi cr1,10,0 |
|---|
| 734 | srdi r8,r5,5 /* Setup the loop counter. */ |
|---|
| 735 | mtocrf 0x01,9 |
|---|
| 736 | cmpldi cr6,r9,1 |
|---|
| 737 | #ifdef __LITTLE_ENDIAN__ |
|---|
| 738 | lvsr v5,r0,r4 |
|---|
| 739 | #else |
|---|
| 740 | lvsl v5,r0,r4 |
|---|
| 741 | #endif |
|---|
| 742 | lvx v3,0,r4 |
|---|
| 743 | li r0,0 |
|---|
| 744 | bf 31,L(setup_unaligned_loop_bwd) |
|---|
| 745 | |
|---|
| 746 | /* Copy another 16 bytes to align to 32-bytes due to the loop. */ |
|---|
| 747 | lvx v4,r4,r6 |
|---|
| 748 | #ifdef __LITTLE_ENDIAN__ |
|---|
| 749 | vperm v6,v3,v4,v5 |
|---|
| 750 | #else |
|---|
| 751 | vperm v6,v4,v3,v5 |
|---|
| 752 | #endif |
|---|
| 753 | subi r4,r4,16 |
|---|
| 754 | stvx v6,r11,r6 |
|---|
| 755 | subi r11,r11,16 |
|---|
| 756 | vor v3,v4,v4 |
|---|
| 757 | clrrdi r0,r4,60 |
|---|
| 758 | |
|---|
| 759 | L(setup_unaligned_loop_bwd): |
|---|
| 760 | mtctr r8 |
|---|
| 761 | ble cr6,L(end_unaligned_loop_bwd) |
|---|
| 762 | |
|---|
| 763 | /* Copy 32 bytes at a time using vector instructions. */ |
|---|
| 764 | .align 4 |
|---|
| 765 | L(unaligned_loop_bwd): |
|---|
| 766 | |
|---|
| 767 | /* Note: vr6/vr10 may contain data that was already copied, |
|---|
| 768 | but in order to get proper alignment, we may have to copy |
|---|
| 769 | some portions again. This is faster than having unaligned |
|---|
| 770 | vector instructions though. */ |
|---|
| 771 | |
|---|
| 772 | lvx v4,r4,r6 |
|---|
| 773 | #ifdef __LITTLE_ENDIAN__ |
|---|
| 774 | vperm v6,v3,v4,v5 |
|---|
| 775 | #else |
|---|
| 776 | vperm v6,v4,v3,v5 |
|---|
| 777 | #endif |
|---|
| 778 | lvx v3,r4,r7 |
|---|
| 779 | #ifdef __LITTLE_ENDIAN__ |
|---|
| 780 | vperm v10,v4,v3,v5 |
|---|
| 781 | #else |
|---|
| 782 | vperm v10,v3,v4,v5 |
|---|
| 783 | #endif |
|---|
| 784 | subi r4,r4,32 |
|---|
| 785 | stvx v6,r11,r6 |
|---|
| 786 | stvx v10,r11,r7 |
|---|
| 787 | subi r11,r11,32 |
|---|
| 788 | bdnz L(unaligned_loop_bwd) |
|---|
| 789 | |
|---|
| 790 | clrrdi r0,r4,60 |
|---|
| 791 | |
|---|
| 792 | .align 4 |
|---|
| 793 | L(end_unaligned_loop_bwd): |
|---|
| 794 | |
|---|
| 795 | /* Check for tail bytes. */ |
|---|
| 796 | mtocrf 0x01,r5 |
|---|
| 797 | beqlr cr1 |
|---|
| 798 | |
|---|
| 799 | add r4,r4,0 |
|---|
| 800 | |
|---|
| 801 | /* We have 1~15 tail bytes to copy, and DST is quadword aligned. */ |
|---|
| 802 | /* Copy 8 bytes. */ |
|---|
| 803 | bf 28,4f |
|---|
| 804 | lwz r6,-4(r4) |
|---|
| 805 | lwz r7,-8(r4) |
|---|
| 806 | subi r4,r4,8 |
|---|
| 807 | stw r6,-4(r11) |
|---|
| 808 | stw r7,-8(r11) |
|---|
| 809 | subi r11,r11,8 |
|---|
| 810 | 4: /* Copy 4~7 bytes. */ |
|---|
| 811 | bf 29,L(tail2_bwd) |
|---|
| 812 | lwz r6,-4(r4) |
|---|
| 813 | stw r6,-4(r11) |
|---|
| 814 | bf 30,L(tail5_bwd) |
|---|
| 815 | lhz r7,-6(r4) |
|---|
| 816 | sth r7,-6(r11) |
|---|
| 817 | bflr 31 |
|---|
| 818 | lbz r8,-7(r4) |
|---|
| 819 | stb r8,-7(r11) |
|---|
| 820 | /* Return original DST pointer. */ |
|---|
| 821 | blr |
|---|
| 822 | END_GEN_TB (MEMMOVE, TB_TOCLESS) |
|---|
| 823 | libc_hidden_builtin_def (memmove) |
|---|
| 824 | |
|---|
