resolve #4, h/t ksherlock

2020-01-03 19:41:25 -08:00 · 2020-01-03 19:41:25 -08:00 · 7f57ba6f06
parent 30a8a259c7
commit 7f57ba6f06
1 changed files with 3 additions and 8 deletions
--- a/asm/mathlib.s
+++ b/asm/mathlib.s
@ -8,14 +8,9 @@
          lda   STACKBASE+6,x
          eor   STACKBASE+2,x
          bpl   samesign
-          lda   STACKBASE+4,x
-          cmp   STACKBASE+0,x
-          lda   STACKBASE+6,x
-          sbc   STACKBASE+2,x
-          bvs   :+
-          eor   #$8000
-:         sec                       ; make sure we don't set Z
-          rol                       ; move comparison into carry
+          lda   STACKBASE+2,x       ; Kelvin's excellent solution
+          sec
+          rol
          rts
 samesign: lda   STACKBASE+6,x
          cmp   STACKBASE+2,x