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285 lines
3.8 KiB
ArmAsm
285 lines
3.8 KiB
ArmAsm
.text
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.set noat
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.set noreorder
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.align 5
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.globl bn_mul_mont
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.ent bn_mul_mont
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bn_mul_mont:
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lw $8,16($29)
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lw $9,20($29)
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slt $1,$9,4
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bnez $1,1f
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li $2,0
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slt $1,$9,17 # on in-order CPU
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bnez $1,bn_mul_mont_internal
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nop
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1: jr $31
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li $4,0
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.end bn_mul_mont
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.align 5
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.ent bn_mul_mont_internal
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bn_mul_mont_internal:
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.frame $30,14*4,$31
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.mask 0x40000000|16711680,-4
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sub $29,14*4
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sw $30,(14-1)*4($29)
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sw $23,(14-2)*4($29)
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sw $22,(14-3)*4($29)
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sw $21,(14-4)*4($29)
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sw $20,(14-5)*4($29)
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sw $19,(14-6)*4($29)
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sw $18,(14-7)*4($29)
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sw $17,(14-8)*4($29)
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sw $16,(14-9)*4($29)
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move $30,$29
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.set reorder
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lw $8,0($8)
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lw $13,0($6) # bp[0]
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lw $12,0($5) # ap[0]
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lw $14,0($7) # np[0]
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sub $29,2*4 # place for two extra words
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sll $9,2
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li $1,-4096
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sub $29,$9
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and $29,$1
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multu $12,$13
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lw $16,4($5)
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lw $18,4($7)
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mflo $10
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mfhi $11
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multu $10,$8
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mflo $23
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multu $16,$13
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mflo $16
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mfhi $17
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multu $14,$23
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mflo $24
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mfhi $25
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multu $18,$23
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addu $24,$10
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sltu $1,$24,$10
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addu $25,$1
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mflo $18
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mfhi $19
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move $15,$29
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li $22,2*4
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.align 4
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.L1st:
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.set noreorder
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add $12,$5,$22
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add $14,$7,$22
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lw $12,($12)
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lw $14,($14)
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multu $12,$13
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addu $10,$16,$11
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addu $24,$18,$25
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sltu $1,$10,$11
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sltu $2,$24,$25
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addu $11,$17,$1
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addu $25,$19,$2
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mflo $16
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mfhi $17
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addu $24,$10
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sltu $1,$24,$10
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multu $14,$23
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addu $25,$1
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addu $22,4
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sw $24,($15)
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sltu $2,$22,$9
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mflo $18
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mfhi $19
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bnez $2,.L1st
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add $15,4
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.set reorder
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addu $10,$16,$11
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sltu $1,$10,$11
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addu $11,$17,$1
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addu $24,$18,$25
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sltu $2,$24,$25
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addu $25,$19,$2
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addu $24,$10
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sltu $1,$24,$10
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addu $25,$1
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sw $24,($15)
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addu $25,$11
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sltu $1,$25,$11
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sw $25,4($15)
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sw $1,2*4($15)
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li $21,4
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.align 4
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.Louter:
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add $13,$6,$21
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lw $13,($13)
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lw $12,($5)
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lw $16,4($5)
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lw $20,($29)
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multu $12,$13
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lw $14,($7)
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lw $18,4($7)
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mflo $10
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mfhi $11
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addu $10,$20
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multu $10,$8
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sltu $1,$10,$20
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addu $11,$1
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mflo $23
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multu $16,$13
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mflo $16
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mfhi $17
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multu $14,$23
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mflo $24
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mfhi $25
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multu $18,$23
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addu $24,$10
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sltu $1,$24,$10
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addu $25,$1
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mflo $18
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mfhi $19
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move $15,$29
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li $22,2*4
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lw $20,4($15)
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.align 4
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.Linner:
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.set noreorder
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add $12,$5,$22
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add $14,$7,$22
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lw $12,($12)
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lw $14,($14)
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multu $12,$13
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addu $10,$16,$11
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addu $24,$18,$25
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sltu $1,$10,$11
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sltu $2,$24,$25
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addu $11,$17,$1
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addu $25,$19,$2
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mflo $16
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mfhi $17
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addu $10,$20
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addu $22,4
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multu $14,$23
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sltu $1,$10,$20
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addu $24,$10
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addu $11,$1
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sltu $2,$24,$10
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lw $20,2*4($15)
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addu $25,$2
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sltu $1,$22,$9
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mflo $18
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mfhi $19
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sw $24,($15)
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bnez $1,.Linner
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add $15,4
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.set reorder
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addu $10,$16,$11
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sltu $1,$10,$11
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addu $11,$17,$1
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addu $10,$20
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sltu $2,$10,$20
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addu $11,$2
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lw $20,2*4($15)
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addu $24,$18,$25
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sltu $1,$24,$25
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addu $25,$19,$1
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addu $24,$10
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sltu $2,$24,$10
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addu $25,$2
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sw $24,($15)
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addu $24,$25,$11
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sltu $25,$24,$11
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addu $24,$20
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sltu $1,$24,$20
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addu $25,$1
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sw $24,4($15)
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sw $25,2*4($15)
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addu $21,4
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sltu $2,$21,$9
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bnez $2,.Louter
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.set noreorder
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add $20,$29,$9 # &tp[num]
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move $15,$29
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move $5,$29
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li $11,0 # clear borrow bit
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.align 4
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.Lsub: lw $10,($15)
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lw $24,($7)
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add $15,4
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add $7,4
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subu $24,$10,$24 # tp[i]-np[i]
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sgtu $1,$24,$10
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subu $10,$24,$11
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sgtu $11,$10,$24
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sw $10,($4)
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or $11,$1
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sltu $1,$15,$20
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bnez $1,.Lsub
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add $4,4
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subu $11,$25,$11 # handle upmost overflow bit
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move $15,$29
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sub $4,$9 # restore rp
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not $25,$11
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and $5,$11,$29
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and $6,$25,$4
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or $5,$5,$6 # ap=borrow?tp:rp
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.align 4
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.Lcopy: lw $12,($5)
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add $5,4
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sw $0,($15)
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add $15,4
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sltu $1,$15,$20
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sw $12,($4)
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bnez $1,.Lcopy
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add $4,4
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li $4,1
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li $2,1
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.set noreorder
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move $29,$30
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lw $30,(14-1)*4($29)
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lw $23,(14-2)*4($29)
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lw $22,(14-3)*4($29)
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lw $21,(14-4)*4($29)
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lw $20,(14-5)*4($29)
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lw $19,(14-6)*4($29)
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lw $18,(14-7)*4($29)
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lw $17,(14-8)*4($29)
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lw $16,(14-9)*4($29)
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jr $31
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add $29,14*4
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.end bn_mul_mont_internal
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.rdata
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.asciiz "Montgomery Multiplication for MIPS, CRYPTOGAMS by <appro@openssl.org>"
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