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53 lines
1.0 KiB
NASM
53 lines
1.0 KiB
NASM
// Check that multiplication by factors of 2 on the left side is converted to shifts
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// Commodore 64 PRG executable file
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.file [name="multiply-2s-left.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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.label SCREEN = $400
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ldx #0
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__b1:
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// (SCREEN+0*40)[i] = 1*i
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txa
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sta SCREEN,x
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// 2*i
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txa
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asl
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// (SCREEN+1*40)[i] = 2*i
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sta SCREEN+1*$28,x
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// 4*i
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txa
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asl
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asl
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// (SCREEN+2*40)[i] = 4*i
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sta SCREEN+2*$28,x
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// 8*i
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txa
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asl
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asl
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asl
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// (SCREEN+3*40)[i] = 8*i
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sta SCREEN+3*$28,x
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// signed byte sb = -(signed byte)i
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// And a single signed byte
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txa
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eor #$ff
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clc
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adc #1
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// 2*sb
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asl
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// (SCREEN+5*40)[i] = (byte)(2*sb)
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sta SCREEN+5*$28,x
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// for(byte i: 0..10)
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inx
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cpx #$b
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bne __b1
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// }
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rts
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}
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