Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * arch/alpha/lib/memmove.S |
| 4 | * |
| 5 | * Barely optimized memmove routine for Alpha EV5. |
| 6 | * |
| 7 | * This is hand-massaged output from the original memcpy.c. We defer to |
| 8 | * memcpy whenever possible; the backwards copy loops are not unrolled. |
| 9 | */ |
Al Viro | 00fc0e0 | 2016-01-11 09:51:29 -0500 | [diff] [blame] | 10 | #include <asm/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | .set noat |
| 12 | .set noreorder |
| 13 | .text |
| 14 | |
| 15 | .align 4 |
| 16 | .globl memmove |
| 17 | .ent memmove |
| 18 | memmove: |
| 19 | ldgp $29, 0($27) |
| 20 | unop |
| 21 | nop |
| 22 | .prologue 1 |
| 23 | |
| 24 | addq $16,$18,$4 |
| 25 | addq $17,$18,$5 |
| 26 | cmpule $4,$17,$1 /* dest + n <= src */ |
| 27 | cmpule $5,$16,$2 /* dest >= src + n */ |
| 28 | |
| 29 | bis $1,$2,$1 |
| 30 | mov $16,$0 |
| 31 | xor $16,$17,$2 |
| 32 | bne $1,memcpy !samegp |
| 33 | |
| 34 | and $2,7,$2 /* Test for src/dest co-alignment. */ |
| 35 | and $16,7,$1 |
| 36 | cmpule $16,$17,$3 |
| 37 | bne $3,$memmove_up /* dest < src */ |
| 38 | |
| 39 | and $4,7,$1 |
| 40 | bne $2,$misaligned_dn |
| 41 | unop |
| 42 | beq $1,$skip_aligned_byte_loop_head_dn |
| 43 | |
| 44 | $aligned_byte_loop_head_dn: |
| 45 | lda $4,-1($4) |
| 46 | lda $5,-1($5) |
| 47 | unop |
| 48 | ble $18,$egress |
| 49 | |
| 50 | ldq_u $3,0($5) |
| 51 | ldq_u $2,0($4) |
| 52 | lda $18,-1($18) |
| 53 | extbl $3,$5,$1 |
| 54 | |
| 55 | insbl $1,$4,$1 |
| 56 | mskbl $2,$4,$2 |
| 57 | bis $1,$2,$1 |
| 58 | and $4,7,$6 |
| 59 | |
| 60 | stq_u $1,0($4) |
| 61 | bne $6,$aligned_byte_loop_head_dn |
| 62 | |
| 63 | $skip_aligned_byte_loop_head_dn: |
| 64 | lda $18,-8($18) |
| 65 | blt $18,$skip_aligned_word_loop_dn |
| 66 | |
| 67 | $aligned_word_loop_dn: |
| 68 | ldq $1,-8($5) |
| 69 | nop |
| 70 | lda $5,-8($5) |
| 71 | lda $18,-8($18) |
| 72 | |
| 73 | stq $1,-8($4) |
| 74 | nop |
| 75 | lda $4,-8($4) |
| 76 | bge $18,$aligned_word_loop_dn |
| 77 | |
| 78 | $skip_aligned_word_loop_dn: |
| 79 | lda $18,8($18) |
| 80 | bgt $18,$byte_loop_tail_dn |
| 81 | unop |
| 82 | ret $31,($26),1 |
| 83 | |
| 84 | .align 4 |
| 85 | $misaligned_dn: |
| 86 | nop |
| 87 | fnop |
| 88 | unop |
| 89 | beq $18,$egress |
| 90 | |
| 91 | $byte_loop_tail_dn: |
| 92 | ldq_u $3,-1($5) |
| 93 | ldq_u $2,-1($4) |
| 94 | lda $5,-1($5) |
| 95 | lda $4,-1($4) |
| 96 | |
| 97 | lda $18,-1($18) |
| 98 | extbl $3,$5,$1 |
| 99 | insbl $1,$4,$1 |
| 100 | mskbl $2,$4,$2 |
| 101 | |
| 102 | bis $1,$2,$1 |
| 103 | stq_u $1,0($4) |
| 104 | bgt $18,$byte_loop_tail_dn |
| 105 | br $egress |
| 106 | |
| 107 | $memmove_up: |
| 108 | mov $16,$4 |
| 109 | mov $17,$5 |
| 110 | bne $2,$misaligned_up |
| 111 | beq $1,$skip_aligned_byte_loop_head_up |
| 112 | |
| 113 | $aligned_byte_loop_head_up: |
| 114 | unop |
| 115 | ble $18,$egress |
| 116 | ldq_u $3,0($5) |
| 117 | ldq_u $2,0($4) |
| 118 | |
| 119 | lda $18,-1($18) |
| 120 | extbl $3,$5,$1 |
| 121 | insbl $1,$4,$1 |
| 122 | mskbl $2,$4,$2 |
| 123 | |
| 124 | bis $1,$2,$1 |
| 125 | lda $5,1($5) |
| 126 | stq_u $1,0($4) |
| 127 | lda $4,1($4) |
| 128 | |
| 129 | and $4,7,$6 |
| 130 | bne $6,$aligned_byte_loop_head_up |
| 131 | |
| 132 | $skip_aligned_byte_loop_head_up: |
| 133 | lda $18,-8($18) |
| 134 | blt $18,$skip_aligned_word_loop_up |
| 135 | |
| 136 | $aligned_word_loop_up: |
| 137 | ldq $1,0($5) |
| 138 | nop |
| 139 | lda $5,8($5) |
| 140 | lda $18,-8($18) |
| 141 | |
| 142 | stq $1,0($4) |
| 143 | nop |
| 144 | lda $4,8($4) |
| 145 | bge $18,$aligned_word_loop_up |
| 146 | |
| 147 | $skip_aligned_word_loop_up: |
| 148 | lda $18,8($18) |
| 149 | bgt $18,$byte_loop_tail_up |
| 150 | unop |
| 151 | ret $31,($26),1 |
| 152 | |
| 153 | .align 4 |
| 154 | $misaligned_up: |
| 155 | nop |
| 156 | fnop |
| 157 | unop |
| 158 | beq $18,$egress |
| 159 | |
| 160 | $byte_loop_tail_up: |
| 161 | ldq_u $3,0($5) |
| 162 | ldq_u $2,0($4) |
| 163 | lda $18,-1($18) |
| 164 | extbl $3,$5,$1 |
| 165 | |
| 166 | insbl $1,$4,$1 |
| 167 | mskbl $2,$4,$2 |
| 168 | bis $1,$2,$1 |
| 169 | stq_u $1,0($4) |
| 170 | |
| 171 | lda $5,1($5) |
| 172 | lda $4,1($4) |
| 173 | nop |
| 174 | bgt $18,$byte_loop_tail_up |
| 175 | |
| 176 | $egress: |
| 177 | ret $31,($26),1 |
| 178 | nop |
| 179 | nop |
| 180 | nop |
| 181 | |
| 182 | .end memmove |
Al Viro | 00fc0e0 | 2016-01-11 09:51:29 -0500 | [diff] [blame] | 183 | EXPORT_SYMBOL(memmove) |