mirror of
https://gitlab.com/camelot/kickc.git
synced 2024-06-29 09:29:31 +00:00
55 lines
1.0 KiB
NASM
55 lines
1.0 KiB
NASM
// Demonstrates problem with __ma coalescing
|
|
// c1a is erroneously zp-coalesced with c1A
|
|
// Commodore 64 PRG executable file
|
|
.file [name="ma_coalesce_problem.prg", type="prg", segments="Program"]
|
|
.segmentdef Program [segments="Basic, Code, Data"]
|
|
.segmentdef Basic [start=$0801]
|
|
.segmentdef Code [start=$80d]
|
|
.segmentdef Data [startAfter="Code"]
|
|
.segment Basic
|
|
:BasicUpstart(main)
|
|
.label SCREEN = $400
|
|
.segment Code
|
|
main: {
|
|
__b1:
|
|
// char c1a = c1A
|
|
lda c1A
|
|
sta c1a
|
|
// char i = 0
|
|
lda #0
|
|
sta i
|
|
__b2:
|
|
// for (char i = 0; i < 40; ++i)
|
|
lda i
|
|
cmp #$28
|
|
bcc __b3
|
|
// c1A += 3
|
|
lax c1A
|
|
axs #-[3]
|
|
stx c1A
|
|
jmp __b1
|
|
__b3:
|
|
// SCREEN[i] = SINTABLE[c1a]
|
|
ldy c1a
|
|
lda SINTABLE,y
|
|
ldy i
|
|
sta SCREEN,y
|
|
// c1a += 4
|
|
lax c1a
|
|
axs #-[4]
|
|
stx c1a
|
|
// for (char i = 0; i < 40; ++i)
|
|
inc i
|
|
jmp __b2
|
|
.segment Data
|
|
c1a: .byte 0
|
|
i: .byte 0
|
|
}
|
|
.align $100
|
|
SINTABLE:
|
|
.for(var i=0;i<$100;i++)
|
|
.byte round(127.5+127.5*sin(2*PI*i/256))
|
|
|
|
// Plasma state variables
|
|
c1A: .byte 0
|