dec and inc was swapped, and results are not stored correctly

2014-12-07 15:10:05 +09:00 · 2014-12-07 15:10:05 +09:00 · c5d69f2c14
parent c3c8eafc07
commit c5d69f2c14
1 changed files with 4 additions and 6 deletions
--- a/6502.S
+++ b/6502.S
@ -451,20 +451,18 @@
 .endm

 .macro _dec
-  mov  r0, RA
-  adds r0, r0, #1
+  subs r0, r0, #1
  uxtb r0, r0
-  mov  RA, r0
  _flag_nz
+  mov  T0, r0
  adds PC, PC, #1
 .endm

 .macro _inc
-  mov  r0, RA
-  subs r0, r0, #1
+  adds r0, r0, #1
  uxtb r0, r0
-  mov  RA, r0
  _flag_nz
+  mov  T0, r0
  adds PC, PC, #1
 .endm