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math.asm
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number_to_string_99:
; Input:
; a = number [0, 99]
; Output:
; e = LSD
; d = MSD
ld b, a
xor a, a
.bit_0:
bit 0, b
jq z, .bit_0_end
inc a
.bit_0_end:
.bit_1:
bit 1, b
jq z, .bit_1_end
inc a
inc a
.bit_1_end:
.bit_2:
bit 2, b
jq z, .bit_2_end
add a, $04
.bit_2_end:
.bit_3:
bit 3, b
jq z, .bit_3_end
add a, $08
daa
.bit_3_end:
.bit_4:
bit 4, b
jq z, .bit_4_end
add a, $16
daa
.bit_4_end:
.bit_5:
bit 5, b
jq z, .bit_5_end
add a, $32
daa
.bit_5_end:
.bit_6:
bit 6, b
jq z, .bit_6_end
add a, $64
daa
.bit_6_end:
ld b, a
and a, $0F
add a, '0'
ld d, a
ld a, b
rrca
rrca
rrca
rrca
and a, $0F
add a, '0'
ld e, a
ret
; Domain: [1, 511]
u9_to_float_op1:
xor a, a
ld c, a
.bit_0: ; 1
bit 0, l
jq z, .bit_0_end
inc a
.bit_0_end:
.bit_1: ; 2
bit 1, l
jq z, .bit_1_end
inc a
inc a
.bit_1_end:
.bit_2: ; 4
bit 2, l
jq z, .bit_2_end
add a, $04
.bit_2_end:
.bit_3: ; 8
bit 3, l
jq z, .bit_3_end
add a, $08
daa
.bit_3_end:
.bit_4: ; 16
bit 4, l
jq z, .bit_4_end
add a, $16
daa
.bit_4_end:
.bit_5: ; 32
bit 5, l
jq z, .bit_5_end
add a, $32
daa
.bit_5_end:
.bit_6: ; 64
bit 6, l
jq z, .bit_6_end
add a, $64
daa
jq nc, .bit_6_end
inc c
.bit_6_end:
.bit_7: ; 128
bit 7, l
jq z, .bit_7_end
inc c
add a, $28
daa
jq nc, .bit_7_end
inc c
.bit_7_end:
.bit_8: ; 256
bit 0, h
jq z, .bit_8_end
inc c
inc c
add a, $56
daa
jq nc, .bit_8_end
inc c
.bit_8_end:
ld b, a
ld a, c
; BCD = AA BB
ld c, $81 ; Inital exponent
.bcd_shift_loop:
tst a, $F0
jq nz, .bcd_shift_end
inc c
; b << 4 copy to carry with zeros
; a << 4 with carry
repeat 4
sla b
rla
end repeat
jp .bcd_shift_loop
.bcd_shift_end:
ld hl, ti.OP1 ; *op1
ld (hl), 0 ; Real | Positive
inc hl ; *op1.exponent
ld (hl), c
ld c, a
inc hl ; *op1.mantissa[0]
ld (hl), bc
; Exponent CC BB ?? ?? ?? ?? ??
ld bc, 0
inc hl
inc hl ; *op1.mantissa[2]
ld (hl), bc
; Exponent CC BB 00 00 00 ?? ??
inc hl
inc hl ; *op1.mantissa[4]
ld (hl), bc
; Exponent CC BB 00 00 00 00 00
ret
float_op1_to_u8:
; Domain: (-0.5, 255.5)
; Range: [0, 255]
; Arguments:
; OP1 = float
; Return:
; a = u8
; OP1 = rounded value
call ti.Int
ld hl, ti.OP1 + 1
ld b, (hl) ; Exponent
ld a, $82
sub a, (hl) ; $82 - exponent
ld b, a
or a, a
jq z, .shift_skip
inc hl
ld hl, (hl) ; Mantissa
.shift_loop:
repeat 4
srl l
rra
end repeat
ld h, a
djnz .shift_loop
.shift_skip:
.bcd_ones:
ld a, h
rrca
rrca
rrca
rrca
.bcd_tens:
ld b, a
ld a, l
and a, $0F
ld c, a
ld a, b
ld b, 10
mlt bc
add a, c
.bcd_hundreds:
srl l
srl l
srl l
srl l
ld h, 100
mlt hl
add a, l
ret