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Brooke Vibber 2024-12-26 12:04:01 -08:00
parent f996c3cbcd
commit 829d2860e8
1 changed files with 3 additions and 2 deletions
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imul8xe.s
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@ -12,6 +12,7 @@ bankswitch:
.endrepeat
; 58-77 cycles
; clobbers x, y, dest to dest + 3
.macro imul8xe dest, arg1, arg2
.local done
.local output
@ -54,10 +55,10 @@ bankswitch:
; check that 1 bit we skipped to fit into space
lda arg1 ; 3 cyc
and $#1 ; 2 cyc
and #1 ; 2 cyc
beq done ; 2 cyc
; add the second param one last tie for the skipped bit
; add the second param one last time for the skipped bit
clc ; 2 cyc
lda arg2 ; 3 cyc
adc output ; 3 cyc