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68 lines
1.2 KiB
NASM
68 lines
1.2 KiB
NASM
// Tests elimination of plus 0
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// Commodore 64 PRG executable file
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.file [name="plus-0.prg", type="prg", segments="Program"]
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.segmentdef Program [segments="Basic, Code, Data"]
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.segmentdef Basic [start=$0801]
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.segmentdef Code [start=$80d]
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.segmentdef Data [startAfter="Code"]
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.segment Basic
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:BasicUpstart(main)
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.segment Code
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main: {
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// fill((byte*)$400,'a')
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ldx #'a'
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lda #<$400
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sta.z fill.screen
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lda #>$400
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sta.z fill.screen+1
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jsr fill
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// fill((byte*)$2000,'b')
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ldx #'b'
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lda #<$2000
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sta.z fill.screen
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lda #>$2000
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sta.z fill.screen+1
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jsr fill
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// }
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rts
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}
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// fill(byte* zp(2) screen, byte register(X) ch)
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fill: {
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.label screen = 2
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.label __5 = 4
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.label __7 = 6
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ldy #0
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__b2:
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// (screen+j*40)[i] = ch
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txa
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sta (screen),y
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// screen+j*40
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lda #1*$28
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clc
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adc.z screen
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sta.z __5
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lda #0
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adc.z screen+1
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sta.z __5+1
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// (screen+j*40)[i] = ch
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txa
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sta (__5),y
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// screen+j*40
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lda #2*$28
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clc
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adc.z screen
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sta.z __7
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lda #0
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adc.z screen+1
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sta.z __7+1
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// (screen+j*40)[i] = ch
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txa
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sta (__7),y
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// for(byte i: 0..39)
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iny
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cpy #$28
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bne __b2
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// }
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rts
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}
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