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Don't set carry when already set.

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Piotr Fusik
2019-11-05 20:16:21 +01:00
committed by Oliver Schmidt
parent 2bec637637
commit 421c3f2b4f
1 changed files with 3 additions and 1 deletions
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4
libsrc/runtime/imul8x8r16.s
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@@ -1,6 +1,7 @@
; ;
; 2010-11-02, Ullrich von Bassewitz ; 2010-11-02, Ullrich von Bassewitz
; 2014-09-10, Greg King ; 2014-09-10, Greg King
; 2019-11-05, Piotr Fusik
; ;
; CC65 runtime: 8x8 => 16 signed multiplication ; CC65 runtime: 8x8 => 16 signed multiplication
; ;
@@ -59,7 +60,8 @@ NegMult:
bnz @L2 ; Branch always bnz @L2 ; Branch always
@L0: tya ; Subtract current multiplicand @L0: tya ; Subtract current multiplicand
sub ptr3 ; sec
sbc ptr3
tay tay
txa txa
sbc ptr3+1 sbc ptr3+1