From 025e7c835ab310119ee1a4e7c5505459efe29258 Mon Sep 17 00:00:00 2001
From: degasus <wickmarkus@web.de>
Date: Sun, 23 Aug 2015 11:22:46 +0200
Subject: [PATCH] JitArm64: Implement subfcx

---
 Source/Core/Core/PowerPC/JitArm64/Jit.h       |  1 +
 .../PowerPC/JitArm64/JitArm64_Integer.cpp     | 32 +++++++++++++++++++
 .../Core/PowerPC/JitArm64/JitArm64_Tables.cpp |  4 +--
 3 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/Source/Core/Core/PowerPC/JitArm64/Jit.h b/Source/Core/Core/PowerPC/JitArm64/Jit.h
index 9d44f967ef..6022e9eb64 100644
--- a/Source/Core/Core/PowerPC/JitArm64/Jit.h
+++ b/Source/Core/Core/PowerPC/JitArm64/Jit.h
@@ -100,6 +100,7 @@ public:
 	void slwx(UGeckoInstruction inst);
 	void rlwimix(UGeckoInstruction inst);
 	void subfex(UGeckoInstruction inst);
+	void subfcx(UGeckoInstruction inst);
 
 	// System Registers
 	void mtmsr(UGeckoInstruction inst);
diff --git a/Source/Core/Core/PowerPC/JitArm64/JitArm64_Integer.cpp b/Source/Core/Core/PowerPC/JitArm64/JitArm64_Integer.cpp
index 937bd07f3d..8c27c56ad8 100644
--- a/Source/Core/Core/PowerPC/JitArm64/JitArm64_Integer.cpp
+++ b/Source/Core/Core/PowerPC/JitArm64/JitArm64_Integer.cpp
@@ -784,6 +784,38 @@ void JitArm64::subfex(UGeckoInstruction inst)
 		ComputeRC(gpr.R(d), 0);
 }
 
+void JitArm64::subfcx(UGeckoInstruction inst)
+{
+	INSTRUCTION_START
+	JITDISABLE(bJITIntegerOff);
+	FALLBACK_IF(inst.OE);
+
+	int a = inst.RA, b = inst.RB, d = inst.RD;
+
+	if (gpr.IsImm(a) && gpr.IsImm(b))
+	{
+		u32 a_imm = gpr.GetImm(a), b_imm = gpr.GetImm(b);
+
+		gpr.SetImmediate(d, b_imm - a_imm);
+		ComputeCarry(a_imm == 0 || Interpreter::Helper_Carry(b_imm, 0u - a_imm));
+
+		if (inst.Rc)
+			ComputeRC(gpr.GetImm(d), 0);
+	}
+	else
+	{
+		gpr.BindToRegister(d, d == a || d == b);
+
+		// d = b - a
+		SUBS(gpr.R(d), gpr.R(b), gpr.R(a));
+
+		ComputeCarry();
+
+		if (inst.Rc)
+			ComputeRC(gpr.R(d), 0);
+	}
+}
+
 void JitArm64::addcx(UGeckoInstruction inst)
 {
 	INSTRUCTION_START
diff --git a/Source/Core/Core/PowerPC/JitArm64/JitArm64_Tables.cpp b/Source/Core/Core/PowerPC/JitArm64/JitArm64_Tables.cpp
index 7b3327706e..6111e33e5a 100644
--- a/Source/Core/Core/PowerPC/JitArm64/JitArm64_Tables.cpp
+++ b/Source/Core/Core/PowerPC/JitArm64/JitArm64_Tables.cpp
@@ -192,8 +192,8 @@ static GekkoOPTemplate table31[] =
 	{616,  &JitArm64::negx},                    // negox
 	{40,   &JitArm64::subfx},                   // subfx
 	{552,  &JitArm64::subfx},                   // subfox
-	{8,    &JitArm64::FallBackToInterpreter},   // subfcx
-	{520,  &JitArm64::FallBackToInterpreter},   // subfcox
+	{8,    &JitArm64::subfcx},                  // subfcx
+	{520,  &JitArm64::subfcx},                  // subfcox
 	{136,  &JitArm64::subfex},                  // subfex
 	{648,  &JitArm64::subfex},                  // subfeox
 	{232,  &JitArm64::FallBackToInterpreter},   // subfmex