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62 lines
1.1 KiB
NASM
62 lines
1.1 KiB
NASM
// Example of structs that can be optimized by going planar
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// https://cc65.github.io/mailarchive/2010-09/8593.html?fbclid=IwAR1IF_cTdyWcFeKU93VfL2Un1EuLjkGh7O7dQ4EVj4kpJzJAj01dbmEFQt8
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.pc = $801 "Basic"
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:BasicUpstart(main)
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.pc = $80d "Program"
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.const OFFSET_STRUCT_POS_Y = 1
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.const XSPACE = $14
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.const YSPACE = $14
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.label x = 3
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.label idx = 4
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.label y = 5
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.label line = 2
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main: {
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lda #0
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sta.z y
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sta.z idx
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sta.z x
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sta.z line
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__b1:
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// for (line=0;line<8;++line)
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lda.z line
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cmp #8
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bcc __b2
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// }
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rts
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__b2:
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// ++x;
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inc.z x
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ldy #0
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__b3:
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// for (row=0;row<8;++row)
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cpy #8
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bcc __b4
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// y+=YSPACE
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lax.z y
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axs #-[YSPACE]
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stx.z y
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// for (line=0;line<8;++line)
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inc.z line
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jmp __b1
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__b4:
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// p[idx].y=y
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lda.z idx
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asl
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tax
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lda.z y
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sta p+OFFSET_STRUCT_POS_Y,x
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// p[idx].x=x
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lda.z x
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sta p,x
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// ++idx;
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inc.z idx
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// x+=XSPACE
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lax.z x
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axs #-[XSPACE]
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stx.z x
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// for (row=0;row<8;++row)
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iny
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jmp __b3
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}
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p: .fill 2*$40, 0
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