From e0bd5442e4a0c0ed07dd88096015ac4234031b2e Mon Sep 17 00:00:00 2001
From: LegendOfDragoon <the_f1u@yahoo.com>
Date: Mon, 7 Sep 2015 15:05:26 -0700
Subject: [PATCH] Implement RegConst in Compile_LBU

---
 Source/RSP/Recompiler Ops.c | 11 +++++++++++
 Source/RSP/X86.c            | 19 +++++++++++++++++++
 Source/RSP/X86.h            |  1 +
 3 files changed, 31 insertions(+)

diff --git a/Source/RSP/Recompiler Ops.c b/Source/RSP/Recompiler Ops.c
index 157fc6e2d..7e3eec757 100644
--- a/Source/RSP/Recompiler Ops.c	
+++ b/Source/RSP/Recompiler Ops.c	
@@ -787,6 +787,17 @@ void Compile_LBU ( void ) {
 
 	CPU_Message("  %X %s",CompilePC,RSPOpcodeName(RSPOpC.Hex,CompilePC));
 
+	if (IsRegConst(RSPOpC.base) == TRUE) {
+		char Address[32];
+		DWORD Addr = (MipsRegConst(RSPOpC.base) + Offset) ^ 3;
+		Addr &= 0xfff;
+
+		sprintf(Address, "Dmem + %Xh", Addr);
+		MoveZxVariableToX86regByte(RSPInfo.DMEM + Addr, Address, x86_EAX);
+		MoveX86regToVariable(x86_EAX, &RSP_GPR[RSPOpC.rt].UW, GPR_Name(RSPOpC.rt));
+		return;
+	}
+	
 	MoveVariableToX86reg(&RSP_GPR[RSPOpC.base].UW, GPR_Name(RSPOpC.base), x86_EBX);
 	XorX86RegToX86Reg(x86_EAX, x86_EAX);
 
diff --git a/Source/RSP/X86.c b/Source/RSP/X86.c
index 6344d4a01..4716e359a 100644
--- a/Source/RSP/X86.c
+++ b/Source/RSP/X86.c
@@ -1982,6 +1982,25 @@ void MoveZxX86RegPtrDispToX86RegHalf(int AddrReg, BYTE Disp, int Destination) {
 	PUTDST8(RecompPos, Disp);
 }
 
+void MoveZxVariableToX86regByte(void *Variable, char *VariableName, int x86reg) {
+	CPU_Message("      movzx %s, byte ptr [%s]",x86_Name(x86reg),VariableName);
+
+	PUTDST16(RecompPos, 0xb60f);
+
+	switch (x86reg) {
+	case x86_EAX: PUTDST8(RecompPos,0x05); break;
+	case x86_EBX: PUTDST8(RecompPos,0x1D); break;
+	case x86_ECX: PUTDST8(RecompPos,0x0D); break;
+	case x86_EDX: PUTDST8(RecompPos,0x15); break;
+	case x86_ESI: PUTDST8(RecompPos,0x35); break;
+	case x86_EDI: PUTDST8(RecompPos,0x3D); break;
+	case x86_ESP: PUTDST8(RecompPos,0x25); break;
+	case x86_EBP: PUTDST8(RecompPos,0x2D); break;
+	default: DisplayError("MoveZxVariableToX86regByte\nUnknown x86 Register");
+	}
+    PUTDST32(RecompPos,Variable);
+}
+
 void MoveZxVariableToX86regHalf(void *Variable, char *VariableName, int x86reg) {
 	CPU_Message("      movzx %s, word ptr [%s]",x86_Name(x86reg),VariableName);
 
diff --git a/Source/RSP/X86.h b/Source/RSP/X86.h
index 8378073f2..4a260507e 100644
--- a/Source/RSP/X86.h
+++ b/Source/RSP/X86.h
@@ -147,6 +147,7 @@ void MoveZxX86RegHalfToX86Reg		( int Source, int Destination );
 void MoveZxX86RegPtrDispToX86RegHalf( int AddrReg, BYTE Disp, int Destination );
 void MoveZxN64MemToX86regByte		( int x86reg, int AddrReg );
 void MoveZxN64MemToX86regHalf		( int x86reg, int AddrReg );
+void MoveZxVariableToX86regByte		( void *Variable, char *VariableName, int x86reg );
 void MoveZxVariableToX86regHalf		( void *Variable, char *VariableName, int x86reg );
 void MulX86reg						( int x86reg );
 void NegateX86reg					( int x86reg );