170 lines
2.4 KiB
PHP
170 lines
2.4 KiB
PHP
// vim: filetype=kickass
|
|
|
|
.macro i8_div5_a() {
|
|
sta zp_temp
|
|
lsr
|
|
adc #13
|
|
adc zp_temp
|
|
ror
|
|
lsr
|
|
lsr
|
|
adc zp_temp
|
|
ror
|
|
adc zp_temp
|
|
ror
|
|
lsr
|
|
lsr
|
|
}
|
|
|
|
.macro i16_div8(lo, hi) {
|
|
lsr cursor_pointer_hi
|
|
ror cursor_pointer_lo
|
|
|
|
lsr cursor_pointer_hi
|
|
ror cursor_pointer_lo
|
|
|
|
lsr cursor_pointer_hi
|
|
ror cursor_pointer_lo
|
|
}
|
|
|
|
//
|
|
// u16_div10
|
|
//
|
|
// Divides an unsigned 16-bit integer by 10.
|
|
//
|
|
// d = n * (1 / 10)
|
|
// = floor(n * floor(65536 / 10) / 65536)
|
|
// = floor(n * 6553 / 65536)
|
|
// = floor(n * 6553 >> 16)
|
|
//
|
|
// Input:
|
|
// - $03..$04 - 16-bit unsigned value
|
|
// - Generated multiplication table
|
|
//
|
|
// Output:
|
|
// - $24..$25 - 16-bit unsigned result
|
|
//
|
|
// Destroys: a, x, $22..$25, $fd, $fe
|
|
//
|
|
.macro u16_div10() {
|
|
lda #$19
|
|
sta $fe
|
|
lda #$99
|
|
sta $fd
|
|
|
|
sec
|
|
jsr multiply_16bit_unsigned
|
|
}
|
|
|
|
.macro i8_mul5_a() {
|
|
sta zp_temp
|
|
asl
|
|
asl
|
|
clc
|
|
adc zp_temp
|
|
}
|
|
|
|
// Destroys: lo, hi
|
|
.macro i16_mul2(lo, hi) {
|
|
asl lo
|
|
rol hi
|
|
}
|
|
|
|
// Destroys: lo, hi
|
|
.macro i16_mul4(lo, hi) {
|
|
i16_mul2(lo, hi)
|
|
i16_mul2(lo, hi)
|
|
}
|
|
|
|
// Destroys: lo, hi
|
|
.macro i16_mul8(lo, hi) {
|
|
i16_mul4(lo, hi)
|
|
i16_mul2(lo, hi)
|
|
}
|
|
|
|
// Destroys: a, lo, hi, $fd, $fe
|
|
.macro i16_mul10(lo, hi) {
|
|
i16_mul2(lo, hi)
|
|
|
|
lda lo
|
|
sta $fd
|
|
lda hi
|
|
sta $fe
|
|
|
|
i16_mul4(lo, hi)
|
|
i16_i16_add(lo, hi, $fd, $fe)
|
|
}
|
|
|
|
// Destroys: a, dst_lo, dst_hi
|
|
.macro i16_i8_add_a(dst_lo, dst_hi) {
|
|
clc
|
|
adc dst_lo
|
|
sta dst_lo
|
|
bcc !cc+
|
|
inc dst_hi
|
|
!cc:
|
|
}
|
|
|
|
// Destroys: a, dst_lo, dst_hi
|
|
.macro i16_i16_add(dst_lo, dst_hi, src_lo, src_hi) {
|
|
clc
|
|
lda dst_lo
|
|
adc src_lo
|
|
sta dst_lo
|
|
lda dst_hi
|
|
adc src_hi
|
|
sta dst_hi
|
|
}
|
|
|
|
// Destroys: a, dst_lo, dst_hi
|
|
.macro i16_inc(lo, hi) {
|
|
lda #1
|
|
i16_i8_add_a(lo, hi)
|
|
}
|
|
|
|
.macro i16_i16_sub_imm(dst_lo, dst_hi, src_lo, src_hi, imm) {
|
|
sec
|
|
|
|
lda src_lo
|
|
sbc #<imm
|
|
sta dst_lo
|
|
|
|
lda src_hi
|
|
sbc #>imm
|
|
sta dst_hi
|
|
}
|
|
|
|
// Destroys: a
|
|
.macro i16_i16_sub(dst_lo, dst_hi, a_lo, a_hi, b_lo, b_hi) {
|
|
sec
|
|
|
|
lda a_lo
|
|
sbc b_lo
|
|
sta dst_lo
|
|
lda a_hi
|
|
sbc b_hi
|
|
sta dst_hi
|
|
}
|
|
|
|
.macro i16_imm_i16_sub(dst_lo, dst_hi, imm, src_lo, src_hi) {
|
|
lda src_lo
|
|
eor #$ff
|
|
sec
|
|
adc #<imm
|
|
sta dst_lo
|
|
|
|
lda src_hi
|
|
eor #$ff
|
|
adc #>imm
|
|
sta dst_hi
|
|
}
|
|
|
|
.macro i16_i16_cmp_bne(a_lo, a_hi, b_lo, b_hi, target) {
|
|
lda a_lo
|
|
cmp b_lo
|
|
bne target
|
|
lda a_hi
|
|
cmp b_hi
|
|
bne target
|
|
}
|