Fix NV flags in BIT imm instruction. Fix #80

Author: drhelius

src/huc6280.h

@@ -220,7 +220,6 @@ class HuC6280
     void OPCodes_ASL_Memory(u16 address);
     void OPcodes_Branch(bool condition);
     void OPCodes_BIT(u16 address);
-    void OPCodes_BIT_Immediate(u16 address);
     void OPCodes_BRK();
     void OPCodes_Subroutine();
     void OPCodes_CMP(EightBitRegister* reg, u8 value);

src/huc6280_opcodes.cpp

@@ -853,7 +853,7 @@ void HuC6280::OPCode0x88()
 void HuC6280::OPCode0x89()
 {
     // BIT #nn
-    OPCodes_BIT_Immediate(m_PC.GetValue());
+    OPCodes_BIT(m_PC.GetValue());
     m_PC.Increment();
 }
 

src/huc6280_opcodes_inline.h

@@ -158,16 +158,6 @@ INLINE void HuC6280::OPCodes_BIT(u16 address)
     m_P.SetValue(flags);
 }
 
-INLINE void HuC6280::OPCodes_BIT_Immediate(u16 address)
-{
-    u8 value = m_memory->Read(address);
-    u8 result = m_A.GetValue() & value;
-    ClearFlag(FLAG_ZERO);
-    u8 flags = m_P.GetValue();
-    flags |= (m_zn_flags_lut[result] & FLAG_ZERO);
-    m_P.SetValue(flags);
-}
-
 INLINE void HuC6280::OPCodes_BRK()
 {
     u16 pc = m_PC.GetValue();