14 February 2021, 14:59
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#10
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Registered User
Join Date: Dec 2017
Location: Denmark
Posts: 179
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Quote:
Originally Posted by ross
Good idea  (not sure if it gains speed)
This can be extended to save registers by knowing the constant distance between destination bplanes.
Code:
.copy_tile_right: ; Right copy
move.w (a0)+,d2
move.w (a5,d2.l*2),(a1) ; Bitplane 1
move.w (a0)+,d2
move.w (a5,d2.l*2),($xxxx.w,a1) ; Bitplane 2
move.w (a0)+,d2
move.w (a5,d2.l*2),($xxxx*2.w,a1) ; Bitplane 3
move.w (a0)+,d2
move.w (a5,d2.l*2),($xxxx*3.w,a1) ; Bitplane 4
adda.l d0,a1
dbf d1,.copy_tile_right
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Sweet.. would this work?:
Code:
.copy_tile_right: ; Right copy
movem.w (a0)+,d2/d3/d4/d5
move.w (a5,d2.l*2),(a1) ; Bitplane 1
move.w (a5,d3.l*2),($xxxx.w,a1) ; Bitplane 2
move.w (a5,d4.l*2),($xxxx*2.w,a1) ; Bitplane 3
move.w (a5,d5.l*2),($xxxx*3.w,a1) ; Bitplane 4
adda.l d0,a1
dbf d1,.copy_tile_right
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