From fa04c025a2108be9bd0432d3d56606e2ef3027f4 Mon Sep 17 00:00:00 2001
From: João Silva
Date: Sun, 12 Feb 2017 03:49:21 +0000
Subject: CPU and Memory Layout accuracy improvements from uosnes and
 optimizations from snes9x2002.

---
 source/cpumacro.h | 488 ++++++++++++++++++++++++++++--------------------------
 1 file changed, 256 insertions(+), 232 deletions(-)

(limited to 'source/cpumacro.h')

diff --git a/source/cpumacro.h b/source/cpumacro.h
index eb76b69..5868fed 100644
--- a/source/cpumacro.h
+++ b/source/cpumacro.h
@@ -3,50 +3,49 @@
 #ifndef _CPUMACRO_H_
 #define _CPUMACRO_H_
 
-static void SetZN16(uint16_t Work)
+extern int32_t OpAddress;
+
+static inline void SetZN16(uint16_t Work)
 {
    ICPU._Zero = Work != 0;
    ICPU._Negative = (uint8_t)(Work >> 8);
 }
 
-static void SetZN8(uint8_t Work)
+static inline void SetZN8(uint8_t Work)
 {
    ICPU._Zero = Work;
    ICPU._Negative = Work;
 }
 
-static void ADC8(int32_t Addr)
+static inline void ADC8()
 {
-   uint8_t Work8 = S9xGetByte(Addr);
+   uint8_t Work8 = S9xGetByte(OpAddress);
 
    if (CheckDecimal())
    {
-      uint8_t A1 = (ICPU.Registers.A.W) & 0xF;
-      uint8_t A2 = (ICPU.Registers.A.W >> 4) & 0xF;
-      uint8_t W1 = Work8 & 0xF;
-      uint8_t W2 = (Work8 >> 4) & 0xF;
+      uint8_t A1 = (ICPU.Registers.A.W) & 0x0f;
+      uint8_t A2 = (ICPU.Registers.A.W) & 0xf0;
+      uint8_t W1 = Work8 & 0x0f;
+      uint8_t W2 = Work8 & 0xf0;
 
       A1 += W1 + CheckCarry();
-      if (A1 > 9)
+      if (A1 >= 0x0a)
       {
-         A1 -= 10;
-         A1 &= 0xF;
-         A2++;
+         A1 -= 0x0a;
+         A2 += 0x10;
       }
 
       A2 += W2;
-      if (A2 > 9)
+      if (A2 >= 0xa0)
       {
-         A2 -= 10;
-         A2 &= 0xF;
+         A2 -= 0xa0;
          SetCarry();
       }
       else
          ClearCarry();
 
-      int8_t Ans8 = (A2 << 4) | A1;
-      if (~(ICPU.Registers.AL ^ Work8) &
-            (Work8 ^ Ans8) & 0x80)
+      uint8_t Ans8 = A2 | A1;
+      if (~(ICPU.Registers.AL ^ Work8) & (Work8 ^ Ans8) & 0x80)
          SetOverflow();
       else
          ClearOverflow();
@@ -54,12 +53,9 @@ static void ADC8(int32_t Addr)
    }
    else
    {
-      int16_t Ans16 = ICPU.Registers.AL + Work8 + CheckCarry();
-
-      ICPU._Carry = Ans16 >= 0x100;
-
-      if (~(ICPU.Registers.AL ^ Work8) &
-            (Work8 ^ (uint8_t) Ans16) & 0x80)
+      uint16_t Ans16 = ICPU.Registers.AL + Work8 + CheckCarry();
+      ICPU._Carry = Ans16 > 0xff;
+      if (~(ICPU.Registers.AL ^ Work8) & (Work8 ^ (uint8_t) Ans16) & 0x80)
          SetOverflow();
       else
          ClearOverflow();
@@ -68,58 +64,53 @@ static void ADC8(int32_t Addr)
    SetZN8(ICPU.Registers.AL);
 }
 
-static void ADC16(int32_t Addr)
+static inline void ADC16()
 {
-   uint16_t Work16 = S9xGetWord(Addr);
+   uint16_t Work16 = S9xGetWord(OpAddress);
 
    if (CheckDecimal())
    {
-      uint8_t A1 = (ICPU.Registers.A.W) & 0xF;
-      uint8_t A2 = (ICPU.Registers.A.W >> 4) & 0xF;
-      uint8_t A3 = (ICPU.Registers.A.W >> 8) & 0xF;
-      uint8_t A4 = (ICPU.Registers.A.W >> 12) & 0xF;
-      uint8_t W1 = Work16 & 0xF;
-      uint8_t W2 = (Work16 >> 4) & 0xF;
-      uint8_t W3 = (Work16 >> 8) & 0xF;
-      uint8_t W4 = (Work16 >> 12) & 0xF;
+      uint16_t A1 = ICPU.Registers.A.W & 0x000f;
+      uint16_t A2 = ICPU.Registers.A.W & 0x00f0;
+      uint16_t A3 = ICPU.Registers.A.W & 0x0f00;
+      uint16_t A4 = ICPU.Registers.A.W & 0xf000;
+      uint16_t W1 = Work16 & 0x000f;
+      uint16_t W2 = Work16 & 0x00f0;
+      uint16_t W3 = Work16 & 0x0f00;
+      uint16_t W4 = Work16 & 0xf000;
 
       A1 += W1 + CheckCarry();
-      if (A1 > 9)
+      if (A1 >= 0x000a)
       {
-         A1 -= 10;
-         A1 &= 0xF;
-         A2++;
+         A1 -= 0x000a;
+         A2 += 0x0010;
       }
 
       A2 += W2;
-      if (A2 > 9)
+      if (A2 >= 0x00a0)
       {
-         A2 -= 10;
-         A2 &= 0xF;
-         A3++;
+         A2 -= 0x00a0;
+         A3 += 0x0100;
       }
 
       A3 += W3;
-      if (A3 > 9)
+      if (A3 >= 0x0a00)
       {
-         A3 -= 10;
-         A3 &= 0xF;
-         A4++;
+         A3 -= 0x0a00;
+         A4 += 0x1000;
       }
 
       A4 += W4;
-      if (A4 > 9)
+      if (A4 >= 0xa000)
       {
-         A4 -= 10;
-         A4 &= 0xF;
+         A4 -= 0xa000;
          SetCarry();
       }
       else
          ClearCarry();
 
-      uint16_t Ans16 = (A4 << 12) | (A3 << 8) | (A2 << 4) | (A1);
-      if (~(ICPU.Registers.A.W ^ Work16) &
-            (Work16 ^ Ans16) & 0x8000)
+      uint16_t Ans16 = A4 | A3 | A2 | A1;
+      if (~(ICPU.Registers.A.W ^ Work16) & (Work16 ^ Ans16) & 0x8000)
          SetOverflow();
       else
          ClearOverflow();
@@ -129,10 +120,9 @@ static void ADC16(int32_t Addr)
    {
       uint32_t Ans32 = ICPU.Registers.A.W + Work16 + CheckCarry();
 
-      ICPU._Carry = Ans32 >= 0x10000;
+      ICPU._Carry = Ans32 > 0xffff;
 
-      if (~(ICPU.Registers.A.W ^ Work16) &
-            (Work16 ^ (uint16_t) Ans32) & 0x8000)
+      if (~(ICPU.Registers.A.W ^ Work16) & (Work16 ^ (uint16_t) Ans32) & 0x8000)
          SetOverflow();
       else
          ClearOverflow();
@@ -141,15 +131,15 @@ static void ADC16(int32_t Addr)
    SetZN16(ICPU.Registers.A.W);
 }
 
-static void AND16(int32_t Addr)
+static inline void AND16()
 {
-   ICPU.Registers.A.W &= S9xGetWord(Addr);
+   ICPU.Registers.A.W &= S9xGetWord(OpAddress);
    SetZN16(ICPU.Registers.A.W);
 }
 
-static void AND8(int32_t Addr)
+static inline void AND8()
 {
-   ICPU.Registers.AL &= S9xGetByte(Addr);
+   ICPU.Registers.AL &= S9xGetByte(OpAddress);
    SetZN8(ICPU.Registers.AL);
 }
 
@@ -173,81 +163,85 @@ static inline void A_ASL8()
    SetZN8(ICPU.Registers.AL);
 }
 
-static void ASL16(int32_t Addr)
+static inline void ASL16()
 {
-   uint16_t Work16 = S9xGetWord(Addr);
+#ifndef SA1_OPCODES
+   CPU.Cycles += ONE_CYCLE;
+#endif
+   uint16_t Work16 = S9xGetWord(OpAddress);
    ICPU._Carry = (Work16 & 0x8000) != 0;
    Work16 <<= 1;
-   S9xSetByte(Work16 >> 8, Addr + 1);
-   S9xSetByte(Work16 & 0xFF, Addr);
+   S9xSetByte(Work16 >> 8, OpAddress + 1);
+   S9xSetByte(Work16 & 0xFF, OpAddress);
    SetZN16(Work16);
 }
 
-static void ASL8(int32_t Addr)
+static inline void ASL8()
 {
-   uint8_t Work8 = S9xGetByte(Addr);
+#ifndef SA1_OPCODES
+   CPU.Cycles += ONE_CYCLE;
+#endif
+   uint8_t Work8 = S9xGetByte(OpAddress);
    ICPU._Carry = (Work8 & 0x80) != 0;
    Work8 <<= 1;
-   S9xSetByte(Work8, Addr);
+   S9xSetByte(Work8, OpAddress);
    SetZN8(Work8);
 }
 
-static void BIT16(int32_t Addr)
+static inline void BIT16()
 {
-   uint16_t Work16 = S9xGetWord(Addr);
+   uint16_t Work16 = S9xGetWord(OpAddress);
    ICPU._Overflow = (Work16 & 0x4000) != 0;
    ICPU._Negative = (uint8_t)(Work16 >> 8);
    ICPU._Zero = (Work16 & ICPU.Registers.A.W) != 0;
 }
 
-static void BIT8(int32_t Addr)
+static inline void BIT8()
 {
-   uint8_t Work8 = S9xGetByte(Addr);
+   uint8_t Work8 = S9xGetByte(OpAddress);
    ICPU._Overflow = (Work8 & 0x40) != 0;
    ICPU._Negative = Work8;
    ICPU._Zero = Work8 & ICPU.Registers.AL;
 }
 
-static void CMP16(int32_t Addr)
+static inline void CMP16()
 {
-   int32_t Int32 = (int32_t) ICPU.Registers.A.W - (int32_t) S9xGetWord(Addr);
+   int32_t Int32 = (int32_t) ICPU.Registers.A.W - (int32_t) S9xGetWord(OpAddress);
    ICPU._Carry = Int32 >= 0;
    SetZN16((uint16_t) Int32);
 }
 
-static void CMP8(int32_t Addr)
+static inline void CMP8()
 {
-   int16_t Int16 = (int16_t) ICPU.Registers.AL - (int16_t) S9xGetByte(Addr);
+   int16_t Int16 = (int16_t) ICPU.Registers.AL - (int16_t) S9xGetByte(OpAddress);
    ICPU._Carry = Int16 >= 0;
    SetZN8((uint8_t) Int16);
 }
 
-static void CMX16(int32_t Addr)
+static inline void CMX16()
 {
-   int32_t Int32 = (int32_t) ICPU.Registers.X.W - (int32_t) S9xGetWord(Addr);
+   int32_t Int32 = (int32_t) ICPU.Registers.X.W - (int32_t) S9xGetWord(OpAddress);
    ICPU._Carry = Int32 >= 0;
    SetZN16((uint16_t) Int32);
 }
 
-static void CMX8(int32_t Addr)
+static inline void CMX8()
 {
-   int16_t Int16 = (int16_t) ICPU.Registers.XL -
-                 (int16_t) S9xGetByte(Addr);
+   int16_t Int16 = (int16_t) ICPU.Registers.XL - (int16_t) S9xGetByte(OpAddress);
    ICPU._Carry = Int16 >= 0;
    SetZN8((uint8_t) Int16);
 }
 
-static void CMY16(int32_t Addr)
+static inline void CMY16()
 {
-   int32_t Int32 = (int32_t) ICPU.Registers.Y.W - (int32_t) S9xGetWord(Addr);
+   int32_t Int32 = (int32_t) ICPU.Registers.Y.W - (int32_t) S9xGetWord(OpAddress);
    ICPU._Carry = Int32 >= 0;
    SetZN16((uint16_t) Int32);
 }
 
-static void CMY8(int32_t Addr)
+static inline void CMY8()
 {
-   int16_t Int16 = (int16_t) ICPU.Registers.YL -
-                 (int16_t) S9xGetByte(Addr);
+   int16_t Int16 = (int16_t) ICPU.Registers.YL - (int16_t) S9xGetByte(OpAddress);
    ICPU._Carry = Int16 >= 0;
    SetZN8((uint8_t) Int16);
 }
@@ -260,7 +254,6 @@ static inline void A_DEC16()
 #ifdef CPU_SHUTDOWN
    CPU.WaitAddress = NULL;
 #endif
-
    ICPU.Registers.A.W--;
    SetZN16(ICPU.Registers.A.W);
 }
@@ -273,43 +266,46 @@ static inline void A_DEC8()
 #ifdef CPU_SHUTDOWN
    CPU.WaitAddress = NULL;
 #endif
-
    ICPU.Registers.AL--;
    SetZN8(ICPU.Registers.AL);
 }
 
-static void DEC16(int32_t Addr)
+static inline void DEC16()
 {
+#ifndef SA1_OPCODES
+   CPU.Cycles += ONE_CYCLE;
+#endif
 #ifdef CPU_SHUTDOWN
    CPU.WaitAddress = NULL;
 #endif
-
-   uint16_t Work16 = S9xGetWord(Addr) - 1;
-   S9xSetByte(Work16 >> 8, Addr + 1);
-   S9xSetByte(Work16 & 0xFF, Addr);
+   uint16_t Work16 = S9xGetWord(OpAddress) - 1;
+   S9xSetByte(Work16 >> 8, OpAddress + 1);
+   S9xSetByte(Work16 & 0xFF, OpAddress);
    SetZN16(Work16);
 }
 
-static void DEC8(int32_t Addr)
+static inline void DEC8()
 {
+#ifndef SA1_OPCODES
+   CPU.Cycles += ONE_CYCLE;
+#endif
 #ifdef CPU_SHUTDOWN
    CPU.WaitAddress = NULL;
 #endif
-
-   uint8_t Work8 = S9xGetByte(Addr) - 1;
-   S9xSetByte(Work8, Addr);
+   uint8_t Work8 = S9xGetByte(OpAddress) - 1;
+   S9xSetByte(Work8, OpAddress);
    SetZN8(Work8);
 }
 
-static void EOR16(int32_t Addr)
+static inline void EOR16()
 {
-   ICPU.Registers.A.W ^= S9xGetWord(Addr);
+   ICPU.Registers.A.W ^= S9xGetWord(OpAddress);
    SetZN16(ICPU.Registers.A.W);
 }
 
-static void EOR8(int32_t Addr)
+static inline void EOR8()
 {
-   ICPU.Registers.AL ^= S9xGetByte(Addr);
+   ICPU.Registers.AL ^= S9xGetByte(OpAddress);
    SetZN8(ICPU.Registers.AL);
 }
 
@@ -321,7 +317,6 @@ static inline void A_INC16()
 #ifdef CPU_SHUTDOWN
    CPU.WaitAddress = NULL;
 #endif
-
    ICPU.Registers.A.W++;
    SetZN16(ICPU.Registers.A.W);
 }
@@ -334,67 +329,70 @@ static inline void A_INC8()
 #ifdef CPU_SHUTDOWN
    CPU.WaitAddress = NULL;
 #endif
-
    ICPU.Registers.AL++;
    SetZN8(ICPU.Registers.AL);
 }
 
-static void INC16(int32_t Addr)
+static inline void INC16()
 {
+#ifndef SA1_OPCODES
+   CPU.Cycles += ONE_CYCLE;
+#endif
 #ifdef CPU_SHUTDOWN
    CPU.WaitAddress = NULL;
 #endif
-
-   uint16_t Work16 = S9xGetWord(Addr) + 1;
-   S9xSetByte(Work16 >> 8, Addr + 1);
-   S9xSetByte(Work16 & 0xFF, Addr);
+   uint16_t Work16 = S9xGetWord(OpAddress) + 1;
+   S9xSetByte(Work16 >> 8, OpAddress + 1);
+   S9xSetByte(Work16 & 0xFF, OpAddress);
    SetZN16(Work16);
 }
 
-static void INC8(int32_t Addr)
+static inline void INC8()
 {
+#ifndef SA1_OPCODES
+   CPU.Cycles += ONE_CYCLE;
+#endif
 #ifdef CPU_SHUTDOWN
    CPU.WaitAddress = NULL;
 #endif
-
-   uint8_t Work8 = S9xGetByte(Addr) + 1;
-   S9xSetByte(Work8, Addr);
+   uint8_t Work8 = S9xGetByte(OpAddress) + 1;
+   S9xSetByte(Work8, OpAddress);
    SetZN8(Work8);
 }
 
-static void LDA16(int32_t Addr)
+static inline void LDA16()
 {
-   ICPU.Registers.A.W = S9xGetWord(Addr);
+   ICPU.Registers.A.W = S9xGetWord(OpAddress);
    SetZN16(ICPU.Registers.A.W);
 }
 
-static void LDA8(int32_t Addr)
+static inline void LDA8()
 {
-   ICPU.Registers.AL = S9xGetByte(Addr);
+   ICPU.Registers.AL = S9xGetByte(OpAddress);
    SetZN8(ICPU.Registers.AL);
 }
 
-static void LDX16(int32_t Addr)
+static inline void LDX16()
 {
-   ICPU.Registers.X.W = S9xGetWord(Addr);
+   ICPU.Registers.X.W = S9xGetWord(OpAddress);
    SetZN16(ICPU.Registers.X.W);
 }
 
-static void LDX8(int32_t Addr)
+static inline void LDX8()
 {
-   ICPU.Registers.XL = S9xGetByte(Addr);
+   ICPU.Registers.XL = S9xGetByte(OpAddress);
    SetZN8(ICPU.Registers.XL);
 }
 
-static void LDY16(int32_t Addr)
+static inline void LDY16()
 {
-   ICPU.Registers.Y.W = S9xGetWord(Addr);
+   ICPU.Registers.Y.W = S9xGetWord(OpAddress);
    SetZN16(ICPU.Registers.Y.W);
 }
 
-static void LDY8(int32_t Addr)
+static inline void LDY8()
 {
-   ICPU.Registers.YL = S9xGetByte(Addr);
+   ICPU.Registers.YL = S9xGetByte(OpAddress);
    SetZN8(ICPU.Registers.YL);
 }
 
@@ -418,34 +416,40 @@ static inline void A_LSR8()
    SetZN8(ICPU.Registers.AL);
 }
 
-static void LSR16(int32_t Addr)
+static inline void LSR16()
 {
-   uint16_t Work16 = S9xGetWord(Addr);
+#ifndef SA1_OPCODES
+   CPU.Cycles += ONE_CYCLE;
+#endif
+   uint16_t Work16 = S9xGetWord(OpAddress);
    ICPU._Carry = Work16 & 1;
    Work16 >>= 1;
-   S9xSetByte(Work16 >> 8, Addr + 1);
-   S9xSetByte(Work16 & 0xFF, Addr);
+   S9xSetByte(Work16 >> 8, OpAddress + 1);
+   S9xSetByte(Work16 & 0xFF, OpAddress);
    SetZN16(Work16);
 }
 
-static void LSR8(int32_t Addr)
+static inline void LSR8()
 {
-   uint8_t Work8 = S9xGetByte(Addr);
+#ifndef SA1_OPCODES
+   CPU.Cycles += ONE_CYCLE;
+#endif
+   uint8_t Work8 = S9xGetByte(OpAddress);
    ICPU._Carry = Work8 & 1;
    Work8 >>= 1;
-   S9xSetByte(Work8, Addr);
+   S9xSetByte(Work8, OpAddress);
    SetZN8(Work8);
 }
 
-static void ORA16(int32_t Addr)
+static inline void ORA16()
 {
-   ICPU.Registers.A.W |= S9xGetWord(Addr);
+   ICPU.Registers.A.W |= S9xGetWord(OpAddress);
    SetZN16(ICPU.Registers.A.W);
 }
 
-static void ORA8(int32_t Addr)
+static inline void ORA8()
 {
-   ICPU.Registers.AL |= S9xGetByte(Addr);
+   ICPU.Registers.AL |= S9xGetByte(OpAddress);
    SetZN8(ICPU.Registers.AL);
 }
 
@@ -455,7 +459,7 @@ static inline void A_ROL16()
    CPU.Cycles += ONE_CYCLE;
 #endif
    uint32_t Work32 = (ICPU.Registers.A.W << 1) | CheckCarry();
-   ICPU._Carry = Work32 >= 0x10000;
+   ICPU._Carry = Work32 > 0xffff;
    ICPU.Registers.A.W = (uint16_t) Work32;
    SetZN16((uint16_t) Work32);
 }
@@ -468,29 +472,35 @@ static inline void A_ROL8()
    uint16_t Work16 = ICPU.Registers.AL;
    Work16 <<= 1;
    Work16 |= CheckCarry();
-   ICPU._Carry = Work16 >= 0x100;
+   ICPU._Carry = Work16 > 0xff;
    ICPU.Registers.AL = (uint8_t) Work16;
    SetZN8((uint8_t) Work16);
 }
 
-static void ROL16(int32_t Addr)
+static inline void ROL16()
 {
-   uint32_t Work32 = S9xGetWord(Addr);
+#ifndef SA1_OPCODES
+   CPU.Cycles += ONE_CYCLE;
+#endif
+   uint32_t Work32 = S9xGetWord(OpAddress);
    Work32 <<= 1;
    Work32 |= CheckCarry();
-   ICPU._Carry = Work32 >= 0x10000;
-   S9xSetByte((Work32 >> 8) & 0xFF, Addr + 1);
-   S9xSetByte(Work32 & 0xFF, Addr);
+   ICPU._Carry = Work32 > 0xffff;
+   S9xSetByte((Work32 >> 8) & 0xFF, OpAddress + 1);
+   S9xSetByte(Work32 & 0xFF, OpAddress);
    SetZN16((uint16_t) Work32);
 }
 
-static void ROL8(int32_t Addr)
+static inline void ROL8()
 {
-   uint16_t Work16 = S9xGetByte(Addr);
+#ifndef SA1_OPCODES
+   CPU.Cycles += ONE_CYCLE;
+#endif
+   uint16_t Work16 = S9xGetByte(OpAddress);
    Work16 <<= 1;
    Work16 |= CheckCarry();
-   ICPU._Carry = Work16 >= 0x100;
-   S9xSetByte((uint8_t) Work16, Addr);
+   ICPU._Carry = Work16 > 0xff;
+   S9xSetByte((uint8_t) Work16, OpAddress);
    SetZN8((uint8_t) Work16);
 }
 
@@ -519,215 +529,229 @@ static inline void A_ROR8()
    SetZN8((uint8_t) Work16);
 }
 
-static void ROR16(int32_t Addr)
+static inline void ROR16()
 {
-   uint32_t Work32 = S9xGetWord(Addr);
+#ifndef SA1_OPCODES
+   CPU.Cycles += ONE_CYCLE;
+#endif
+   uint32_t Work32 = S9xGetWord(OpAddress);
    Work32 |= (int32_t) CheckCarry() << 16;
    ICPU._Carry = (uint8_t)(Work32 & 1);
    Work32 >>= 1;
-   S9xSetByte((Work32 >> 8) & 0x00FF, Addr + 1);
-   S9xSetByte(Work32 & 0x00FF, Addr);
+   S9xSetByte((Work32 >> 8) & 0x00FF, OpAddress + 1);
+   S9xSetByte(Work32 & 0x00FF, OpAddress);
    SetZN16((uint16_t) Work32);
 }
 
-static void ROR8(int32_t Addr)
+static inline void ROR8()
 {
-   uint16_t Work16 = S9xGetByte(Addr);
+#ifndef SA1_OPCODES
+   CPU.Cycles += ONE_CYCLE;
+#endif
+   uint16_t Work16 = S9xGetByte(OpAddress);
    Work16 |= (int32_t) CheckCarry() << 8;
    ICPU._Carry = (uint8_t)(Work16 & 1);
    Work16 >>= 1;
-   S9xSetByte((uint8_t) Work16, Addr);
+   S9xSetByte((uint8_t) Work16, OpAddress);
    SetZN8((uint8_t) Work16);
 }
 
-static void SBC16(int32_t Addr)
+static inline void SBC16()
 {
-   uint16_t Work16 = S9xGetWord(Addr);
+   uint16_t Work16 = S9xGetWord(OpAddress);
 
    if (CheckDecimal())
    {
-      uint8_t A1 = (ICPU.Registers.A.W) & 0xF;
-      uint8_t A2 = (ICPU.Registers.A.W >> 4) & 0xF;
-      uint8_t A3 = (ICPU.Registers.A.W >> 8) & 0xF;
-      uint8_t A4 = (ICPU.Registers.A.W >> 12) & 0xF;
-      uint8_t W1 = Work16 & 0xF;
-      uint8_t W2 = (Work16 >> 4) & 0xF;
-      uint8_t W3 = (Work16 >> 8) & 0xF;
-      uint8_t W4 = (Work16 >> 12) & 0xF;
+      uint16_t A1 = ICPU.Registers.A.W & 0x000f;
+      uint16_t A2 = ICPU.Registers.A.W & 0x00f0;
+      uint16_t A3 = ICPU.Registers.A.W & 0x0f00;
+      uint16_t A4 = ICPU.Registers.A.W & 0xf000;
+      uint16_t W1 = Work16 & 0x000f;
+      uint16_t W2 = Work16 & 0x00f0;
+      uint16_t W3 = Work16 & 0x0f00;
+      uint16_t W4 = Work16 & 0xf000;
 
       A1 -= W1 + !CheckCarry();
       A2 -= W2;
       A3 -= W3;
       A4 -= W4;
-      if (A1 > 9)
+      if (A1 > 0x000f)
       {
-         A1 += 10;
-         A2--;
+         A1 += 0x000a;
+         A1 &= 0x000f;
+         A2 -= 0x0010;
       }
-      if (A2 > 9)
+      if (A2 > 0x00f0)
       {
-         A2 += 10;
-         A3--;
+         A2 += 0x00a0;
+         A2 &= 0x00f0;
+         A3 -= 0x0100;
       }
-      if (A3 > 9)
+      if (A3 > 0x0f00)
       {
-         A3 += 10;
-         A4--;
+         A3 += 0x0a00;
+         A3 &= 0x0f00;
+         A4 -= 0x1000;
       }
-      if (A4 > 9)
+      if (A4 > 0xf000)
       {
-         A4 += 10;
+         A4 += 0xa000;
+         A4 &= 0xf000;
          ClearCarry();
       }
       else
          SetCarry();
 
-      uint16_t Ans16 = (A4 << 12) | (A3 << 8) | (A2 << 4) | (A1);
-      if ((ICPU.Registers.A.W ^ Work16) &
-            (ICPU.Registers.A.W ^ Ans16) & 0x8000)
+      uint16_t Ans16 = A4 | A3 | A2 | A1;
+      if ((ICPU.Registers.A.W ^ Work16) & (ICPU.Registers.A.W ^ Ans16) & 0x8000)
          SetOverflow();
       else
          ClearOverflow();
       ICPU.Registers.A.W = Ans16;
-      SetZN16(ICPU.Registers.A.W);
    }
    else
    {
       int32_t Int32 = (int32_t) ICPU.Registers.A.W - (int32_t) Work16 + (int32_t) CheckCarry() - 1;
-
       ICPU._Carry = Int32 >= 0;
-
-      if ((ICPU.Registers.A.W ^ Work16) &
-            (ICPU.Registers.A.W ^ (uint16_t) Int32) & 0x8000)
+      if ((ICPU.Registers.A.W ^ Work16) & (ICPU.Registers.A.W ^ (uint16_t) Int32) & 0x8000)
          SetOverflow();
       else
          ClearOverflow();
       ICPU.Registers.A.W = (uint16_t) Int32;
-      SetZN16(ICPU.Registers.A.W);
    }
+   SetZN16(ICPU.Registers.A.W);
 }
 
-static void SBC8(int32_t Addr)
+static inline void SBC8()
 {
-   uint8_t Work8 = S9xGetByte(Addr);
+   uint8_t Work8 = S9xGetByte(OpAddress);
    if (CheckDecimal())
    {
-      uint8_t A1 = (ICPU.Registers.A.W) & 0xF;
-      uint8_t A2 = (ICPU.Registers.A.W >> 4) & 0xF;
-      uint8_t W1 = Work8 & 0xF;
-      uint8_t W2 = (Work8 >> 4) & 0xF;
+      uint8_t A1 = ICPU.Registers.A.W & 0x0f;
+      uint8_t A2 = ICPU.Registers.A.W & 0xf0;
+      uint8_t W1 = Work8 & 0x0f;
+      uint8_t W2 = Work8 & 0xf0;
 
       A1 -= W1 + !CheckCarry();
       A2 -= W2;
-      if (A1 > 9)
+      if (A1 > 0x0f)
       {
-         A1 += 10;
-         A2--;
+         A1 += 0x0a;
+         A1 &= 0x0f;
+         A2 -= 0x10;
       }
-      if (A2 > 9)
+      if (A2 > 0xf0)
       {
-         A2 += 10;
+         A2 += 0xa0;
+         A2 &= 0xf0;
          ClearCarry();
       }
       else
          SetCarry();
 
-      uint8_t Ans8 = (A2 << 4) | A1;
-      if ((ICPU.Registers.AL ^ Work8) &
-            (ICPU.Registers.AL ^ Ans8) & 0x80)
+      uint8_t Ans8 = A2 | A1;
+      if ((ICPU.Registers.AL ^ Work8) & (ICPU.Registers.AL ^ Ans8) & 0x80)
          SetOverflow();
       else
          ClearOverflow();
       ICPU.Registers.AL = Ans8;
-      SetZN8(ICPU.Registers.AL);
    }
    else
    {
-      int16_t Int16 = (int16_t) ICPU.Registers.AL - (int16_t) Work8 +
-                    (int16_t) CheckCarry() - 1;
-
+      int16_t Int16 = (int16_t) ICPU.Registers.AL - (int16_t) Work8 + (int16_t) CheckCarry() - 1;
       ICPU._Carry = Int16 >= 0;
-      if ((ICPU.Registers.AL ^ Work8) &
-            (ICPU.Registers.AL ^ (uint8_t) Int16) & 0x80)
+      if ((ICPU.Registers.AL ^ Work8) & (ICPU.Registers.AL ^ (uint8_t) Int16) & 0x80)
          SetOverflow();
       else
          ClearOverflow();
       ICPU.Registers.AL = (uint8_t) Int16;
-      SetZN8(ICPU.Registers.AL);
    }
+   SetZN8(ICPU.Registers.AL);
 }
 
-static void STA16(int32_t Addr)
+static inline void STA16()
 {
-   S9xSetWord(ICPU.Registers.A.W, Addr);
+   S9xSetWord(ICPU.Registers.A.W, OpAddress);
 }
 
-static void STA8(int32_t Addr)
+static inline void STA8()
 {
-   S9xSetByte(ICPU.Registers.AL, Addr);
+   S9xSetByte(ICPU.Registers.AL, OpAddress);
 }
 
-static void STX16(int32_t Addr)
+static inline void STX16()
 {
-   S9xSetWord(ICPU.Registers.X.W, Addr);
+   S9xSetWord(ICPU.Registers.X.W, OpAddress);
 }
 
-static void STX8(int32_t Addr)
+static inline void STX8()
 {
-   S9xSetByte(ICPU.Registers.XL, Addr);
+   S9xSetByte(ICPU.Registers.XL, OpAddress);
 }
 
-static void STY16(int32_t Addr)
+static inline void STY16()
 {
-   S9xSetWord(ICPU.Registers.Y.W, Addr);
+   S9xSetWord(ICPU.Registers.Y.W, OpAddress);
 }
 
-static void STY8(int32_t Addr)
+static inline void STY8()
 {
-   S9xSetByte(ICPU.Registers.YL, Addr);
+   S9xSetByte(ICPU.Registers.YL, OpAddress);
 }
 
-static void STZ16(int32_t Addr)
+static inline void STZ16()
 {
-   S9xSetWord(0, Addr);
+   S9xSetWord(0, OpAddress);
 }
 
-static void STZ8(int32_t Addr)
+static inline void STZ8()
 {
-   S9xSetByte(0, Addr);
+   S9xSetByte(0, OpAddress);
 }
 
-static void TSB16(int32_t Addr)
+static inline void TSB16()
 {
-   uint16_t Work16 = S9xGetWord(Addr);
+#ifndef SA1_OPCODES
+   CPU.Cycles += ONE_CYCLE;
+#endif
+   uint16_t Work16 = S9xGetWord(OpAddress);
    ICPU._Zero = (Work16 & ICPU.Registers.A.W) != 0;
    Work16 |= ICPU.Registers.A.W;
-   S9xSetByte(Work16 >> 8, Addr + 1);
-   S9xSetByte(Work16 & 0xFF, Addr);
+   S9xSetByte(Work16 >> 8, OpAddress + 1);
+   S9xSetByte(Work16 & 0xFF, OpAddress);
 }
 
-static void TSB8(int32_t Addr)
+static inline void TSB8()
 {
-   uint8_t Work8 = S9xGetByte(Addr);
+#ifndef SA1_OPCODES
+   CPU.Cycles += ONE_CYCLE;
+#endif
+   uint8_t Work8 = S9xGetByte(OpAddress);
    ICPU._Zero = Work8 & ICPU.Registers.AL;
    Work8 |= ICPU.Registers.AL;
-   S9xSetByte(Work8, Addr);
+   S9xSetByte(Work8, OpAddress);
 }
 
-static void TRB16(int32_t Addr)
+static inline void TRB16()
 {
-   uint16_t Work16 = S9xGetWord(Addr);
+#ifndef SA1_OPCODES
+   CPU.Cycles += ONE_CYCLE;
+#endif
+   uint16_t Work16 = S9xGetWord(OpAddress);
    ICPU._Zero = (Work16 & ICPU.Registers.A.W) != 0;
    Work16 &= ~ICPU.Registers.A.W;
-   S9xSetByte(Work16 >> 8, Addr + 1);
-   S9xSetByte(Work16 & 0xFF, Addr);
+   S9xSetByte(Work16 >> 8, OpAddress + 1);
+   S9xSetByte(Work16 & 0xFF, OpAddress);
 }
 
-static void TRB8(int32_t Addr)
+static inline void TRB8()
 {
-   uint8_t Work8 = S9xGetByte(Addr);
+#ifndef SA1_OPCODES
+   CPU.Cycles += ONE_CYCLE;
+#endif
+   uint8_t Work8 = S9xGetByte(OpAddress);
    ICPU._Zero = Work8 & ICPU.Registers.AL;
    Work8 &= ~ICPU.Registers.AL;
-   S9xSetByte(Work8, Addr);
+   S9xSetByte(Work8, OpAddress);
 }
 #endif
-- 
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