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56 lines
658 B
NASM
56 lines
658 B
NASM
// Tests optimization of identical sub-expressions
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.pc = $801 "Basic"
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:BasicUpstart(main)
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.pc = $80d "Program"
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main: {
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.label screen = 2
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lda #<$400
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sta.z screen
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lda #>$400
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sta.z screen+1
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ldx #0
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b1:
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txa
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and #1
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cmp #0
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bne b2
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txa
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asl
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asl
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b4:
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ldy #0
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sta (screen),y
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inc.z screen
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bne !+
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inc.z screen+1
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!:
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txa
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and #1
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cmp #0
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bne b5
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txa
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asl
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asl
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b7:
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ldy #0
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sta (screen),y
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inc.z screen
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bne !+
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inc.z screen+1
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!:
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inx
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cpx #3
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bne b1
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rts
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b5:
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txa
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clc
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adc #3
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jmp b7
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b2:
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txa
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clc
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adc #3
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jmp b4
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}
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