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143 lines
3.3 KiB
NASM
Executable file
143 lines
3.3 KiB
NASM
Executable file
_Multiply: ; 37d41 (d:7d41)
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ld a, $8
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ld b, a
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xor a
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ld [H_DIVIDEND], a ; $ff95 (aliases: H_PRODUCT, H_PASTLEADINGZEROES, H_QUOTIENT)
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ld [$ff9b], a
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ld [H_SAVEDNUMTOPRINT], a ; $ff9c
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ld [$ff9d], a
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ld [$ff9e], a
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.asm_37d4f
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ld a, [H_REMAINDER] ; $ff99 (aliases: H_DIVISOR, H_MULTIPLIER, H_POWEROFTEN)
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srl a
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ld [H_REMAINDER], a ; $ff99 (aliases: H_DIVISOR, H_MULTIPLIER, H_POWEROFTEN)
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jr nc, .asm_37d77
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ld a, [$ff9e]
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ld c, a
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ld a, [$ff98]
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add c
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ld [$ff9e], a
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ld a, [$ff9d]
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ld c, a
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ld a, [$ff97]
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adc c
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ld [$ff9d], a
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ld a, [H_SAVEDNUMTOPRINT] ; $ff9c
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ld c, a
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ld a, [H_NUMTOPRINT] ; $ff96 (aliases: H_MULTIPLICAND)
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adc c
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ld [H_SAVEDNUMTOPRINT], a ; $ff9c
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ld a, [$ff9b]
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ld c, a
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ld a, [H_DIVIDEND] ; $ff95 (aliases: H_PRODUCT, H_PASTLEADINGZEROES, H_QUOTIENT)
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adc c
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ld [$ff9b], a
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.asm_37d77
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dec b
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jr z, .asm_37d94
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ld a, [$ff98]
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sla a
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ld [$ff98], a
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ld a, [$ff97]
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rl a
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ld [$ff97], a
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ld a, [H_NUMTOPRINT] ; $ff96 (aliases: H_MULTIPLICAND)
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rl a
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ld [H_NUMTOPRINT], a ; $ff96 (aliases: H_MULTIPLICAND)
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ld a, [H_DIVIDEND] ; $ff95 (aliases: H_PRODUCT, H_PASTLEADINGZEROES, H_QUOTIENT)
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rl a
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ld [H_DIVIDEND], a ; $ff95 (aliases: H_PRODUCT, H_PASTLEADINGZEROES, H_QUOTIENT)
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jr .asm_37d4f
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.asm_37d94
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ld a, [$ff9e]
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ld [$ff98], a
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ld a, [$ff9d]
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ld [$ff97], a
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ld a, [H_SAVEDNUMTOPRINT] ; $ff9c
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ld [H_NUMTOPRINT], a ; $ff96 (aliases: H_MULTIPLICAND)
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ld a, [$ff9b]
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ld [H_DIVIDEND], a ; $ff95 (aliases: H_PRODUCT, H_PASTLEADINGZEROES, H_QUOTIENT)
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ret
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_Divide: ; 37da5 (d:7da5)
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xor a
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ld [$ff9a], a
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ld [$ff9b], a
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ld [H_SAVEDNUMTOPRINT], a ; $ff9c
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ld [$ff9d], a
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ld [$ff9e], a
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ld a, $9
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ld e, a
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.asm_37db3
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ld a, [$ff9a]
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ld c, a
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ld a, [H_NUMTOPRINT] ; $ff96 (aliases: H_MULTIPLICAND)
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sub c
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ld d, a
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ld a, [H_REMAINDER] ; $ff99 (aliases: H_DIVISOR, H_MULTIPLIER, H_POWEROFTEN)
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ld c, a
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ld a, [H_DIVIDEND] ; $ff95 (aliases: H_PRODUCT, H_PASTLEADINGZEROES, H_QUOTIENT)
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sbc c
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jr c, .asm_37dce
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ld [H_DIVIDEND], a ; $ff95 (aliases: H_PRODUCT, H_PASTLEADINGZEROES, H_QUOTIENT)
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ld a, d
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ld [H_NUMTOPRINT], a ; $ff96 (aliases: H_MULTIPLICAND)
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ld a, [$ff9e]
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inc a
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ld [$ff9e], a
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jr .asm_37db3
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.asm_37dce
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ld a, b
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cp $1
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jr z, .asm_37e18
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ld a, [$ff9e]
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sla a
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ld [$ff9e], a
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ld a, [$ff9d]
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rl a
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ld [$ff9d], a
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ld a, [H_SAVEDNUMTOPRINT] ; $ff9c
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rl a
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ld [H_SAVEDNUMTOPRINT], a ; $ff9c
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ld a, [$ff9b]
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rl a
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ld [$ff9b], a
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dec e
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jr nz, .asm_37e04
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ld a, $8
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ld e, a
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ld a, [$ff9a]
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ld [H_REMAINDER], a ; $ff99 (aliases: H_DIVISOR, H_MULTIPLIER, H_POWEROFTEN)
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xor a
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ld [$ff9a], a
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ld a, [H_NUMTOPRINT] ; $ff96 (aliases: H_MULTIPLICAND)
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ld [H_DIVIDEND], a ; $ff95 (aliases: H_PRODUCT, H_PASTLEADINGZEROES, H_QUOTIENT)
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ld a, [$ff97]
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ld [H_NUMTOPRINT], a ; $ff96 (aliases: H_MULTIPLICAND)
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ld a, [$ff98]
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ld [$ff97], a
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.asm_37e04
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ld a, e
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cp $1
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jr nz, .asm_37e0a
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dec b
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.asm_37e0a
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ld a, [H_REMAINDER] ; $ff99 (aliases: H_DIVISOR, H_MULTIPLIER, H_POWEROFTEN)
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srl a
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ld [H_REMAINDER], a ; $ff99 (aliases: H_DIVISOR, H_MULTIPLIER, H_POWEROFTEN)
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ld a, [$ff9a]
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rr a
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ld [$ff9a], a
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jr .asm_37db3
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.asm_37e18
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ld a, [H_NUMTOPRINT] ; $ff96 (aliases: H_MULTIPLICAND)
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ld [H_REMAINDER], a ; $ff99 (aliases: H_DIVISOR, H_MULTIPLIER, H_POWEROFTEN)
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ld a, [$ff9e]
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ld [$ff98], a
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ld a, [$ff9d]
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ld [$ff97], a
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ld a, [H_SAVEDNUMTOPRINT] ; $ff9c
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ld [H_NUMTOPRINT], a ; $ff96 (aliases: H_MULTIPLICAND)
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ld a, [$ff9b]
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ld [H_DIVIDEND], a ; $ff95 (aliases: H_PRODUCT, H_PASTLEADINGZEROES, H_QUOTIENT)
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ret
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