41 lines
752 B
ArmAsm
41 lines
752 B
ArmAsm
;=========================================================
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; hgr copy from $2000 to $4000
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;=========================================================
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; copy $2000 to $4000
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; would be faster if we unroll it, but much bigger
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; 14+ ((14*256)+20)*32 + 5 = 115347 = 8.6fps
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; theoretical unrolled, 30*6 bytes bigger (180 bytes?)
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; 2 + ((9*32)+5)*256 + 5 = 75015 = 13.3 fps
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hgr_copy:
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ldx #0 ; 2
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lda #$20 ; 2
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sta hgr_copy_smc+2 ; 4
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lda #$40 ; 2
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sta hgr_copy_smc+5 ; 4
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hgr_copy_column:
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hgr_copy_smc:
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lda $2000,X ; 4
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sta $4000,X ; 5
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dex ; 2
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bne hgr_copy_column ; 2nt/3t
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inc hgr_copy_smc+2 ; 6
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inc hgr_copy_smc+5 ; 6
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lda hgr_copy_smc+2 ; 4
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cmp #$40 ; 2
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bne hgr_copy_column ; 2/3
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rts ; 6
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