94 lines
1.3 KiB
PHP
94 lines
1.3 KiB
PHP
// vim: filetype=kickass
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.macro i8_div5_a() {
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sta zp_temp
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lsr
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adc #13
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adc zp_temp
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ror
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lsr
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lsr
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adc zp_temp
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ror
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adc zp_temp
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ror
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lsr
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lsr
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}
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.macro i16_div8(lo, hi) {
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lsr cursor_pointer_hi
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ror cursor_pointer_lo
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lsr cursor_pointer_hi
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ror cursor_pointer_lo
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lsr cursor_pointer_hi
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ror cursor_pointer_lo
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}
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.macro i8_mul5_a() {
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sta zp_temp
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asl
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asl
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clc
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adc zp_temp
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}
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// Destroys: lo, hi
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.macro i16_mul2(lo, hi) {
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asl lo
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rol hi
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}
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// Destroys: lo, hi
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.macro i16_mul4(lo, hi) {
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i16_mul2(lo, hi)
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i16_mul2(lo, hi)
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}
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// Destroys: lo, hi
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.macro i16_mul8(lo, hi) {
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i16_mul4(lo, hi)
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i16_mul2(lo, hi)
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}
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// Destroys: a, lo, hi, $fd, $fe
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.macro i16_mul10(lo, hi) {
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i16_mul2(lo, hi)
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lda lo
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sta $fd
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lda hi
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sta $fe
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i16_mul4(lo, hi)
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i16_i16_add(lo, hi, $fd, $fe)
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}
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// Destroys: a, dst_lo, dst_hi
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.macro i16_i8_add_a(dst_lo, dst_hi) {
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clc
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adc dst_lo
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sta dst_lo
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bcc !cc+
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inc dst_hi
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!cc:
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}
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// Destroys: a, dst_lo, dst_hi
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.macro i16_i16_add(dst_lo, dst_hi, src_lo, src_hi) {
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clc
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lda dst_lo
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adc src_lo
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sta dst_lo
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lda dst_hi
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adc src_hi
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sta dst_hi
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}
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// Destroys: a, dst_lo, dst_hi
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.macro i16_inc(lo, hi) {
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lda #1
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i16_i8_add_a(lo, hi)
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}
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