Stacken/c64-livecoding
6
0
Fork 0
Code Issues 1 Pull requests Projects Releases Packages Wiki Activity Actions

optimize general multiplication, less cpu cykels in most cases

Browse source
This commit is contained in:
hugova 2025-05-16 18:36:10 +02:00
parent 3211f6d441
commit 69232b6d53
1 changed files with 4 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
wip-hugo/routines/arithmatic/mult.s
View file

@ -12,15 +12,15 @@
.include "arithmatic.inc" .include "arithmatic.inc"
LDA #$00 LDA #$00
JMP start
loop: loop:
ASL VAL_B ASL VAL_B
start:
ROR VAL_A; add to awnser if VAL_A is odd ROR VAL_A; add to awnser if VAL_A is odd
BCC loop BCC loop
CLC
LSR VAL_B
ADC VAL_B; add val_b because val_a was odd. ADC VAL_B; add val_b because val_a was odd.
ASL VAL_B LDX VAL_B
BNE loop BNE loop
endloop: endloop:
RTS RTS