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