Refactor DEX and DEY to use dec.

hainesr · Oct 24, 2020 · 2cb068f · 2cb068f
1 parent 74d9404
commit 2cb068f
Showing 1 changed file with 2 additions and 4 deletions.
diff --git a/lib/mos6502/cpu_instructions.rb b/lib/mos6502/cpu_instructions.rb
@@ -289,8 +289,7 @@ def instructions
 
         # DEY
         0x88 => lambda {
-          @y = (@y - 1) & 0xff
-          set_nz_flags(@y)
+          @y = dec(@y) & 0xff
         },
 
         # TXA
@@ -536,8 +535,7 @@ def instructions
 
         # DEX
         0xca => lambda {
-          @x = (@x - 1) & 0xff
-          set_nz_flags(@x)
+          @x = dec(@x) & 0xff
         },
 
         # CPY (absolute)