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small screen code size optimization

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FeralChild64 committed 2020-01-08 19:55:39 +01:00
1 parent 9d11276289
commit cfe8736778
2 files changed
+2 -2
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c64/kernal/screen/chrout_screen_tab.s
-1
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@@ -26,7 +26,6 @@ chrout_screen_TAB_FW:
chrout_screen_TAB_BW: chrout_screen_TAB_BW:
jsr screen_get_clipped_PNTR jsr screen_get_clipped_PNTR
cpy #$00 // YYY maybe it's worth to put this inside screen_get_clipped_PNTR?
beq !+ // column 0, recalculating pointers is not necessary, but this is a rare case nevertheless beq !+ // column 0, recalculating pointers is not necessary, but this is a rare case nevertheless
dey dey
c64/kernal/screen/screen_get_cliped_pntr.s
+2 -1
View File
@@ -1,6 +1,6 @@
// //
// Get PNTR value clipped to 0-39 range in .Y, can trash .A // Get PNTR value clipped to 0-39 range in .Y, sets flags to compare with 0, can trash .A
// //
screen_get_clipped_PNTR: screen_get_clipped_PNTR:
@@ -12,4 +12,5 @@ screen_get_clipped_PNTR:
sbc #40 sbc #40
tay tay
!: !:
cpy #$00
rts rts