[AArch64] Implement cntlzwx.

Source/Core/Core/PowerPC/JitArm64/Jit.h

@@ -81,6 +81,7 @@ public:
 	void arith_imm(UGeckoInstruction inst);
 	void boolX(UGeckoInstruction inst);
 	void extsXx(UGeckoInstruction inst);
+	void cntlzwx(UGeckoInstruction inst);
 
 	// System Registers
 	void mtmsr(UGeckoInstruction inst);

Source/Core/Core/PowerPC/JitArm64/JitArm64_Integer.cpp

@@ -243,3 +243,30 @@ void JitArm64::extsXx(UGeckoInstruction inst)
 	if (inst.Rc)
 		ComputeRC(a);
 }
+
+void JitArm64::cntlzwx(UGeckoInstruction inst)
+{
+	INSTRUCTION_START
+	JITDISABLE(bJITIntegerOff);
+	int a = inst.RA;
+	int s = inst.RS;
+
+	if (gpr.IsImm(s))
+	{
+		u32 mask = 0x80000000;
+		u32 i = 0;
+		for (; i < 32; i++, mask >>= 1)
+		{
+			if ((u32)gpr.GetImm(s) & mask)
+				break;
+		}
+		gpr.SetImmediate(a, i);
+	}
+	else
+	{
+		CLZ(gpr.R(a), gpr.R(s));
+	}
+
+	if (inst.Rc)
+		ComputeRC(a);
+}

Source/Core/Core/PowerPC/JitArm64/JitArm64_Tables.cpp

@@ -191,7 +191,7 @@ static GekkoOPTemplate table31[] =
 	{284, &JitArm64::boolX},                    //"eqvx",   OPTYPE_INTEGER, FL_OUT_A | FL_IN_SB | FL_RC_BIT}},
 	{0,   &JitArm64::FallBackToInterpreter},    //"cmp",    OPTYPE_INTEGER, FL_IN_AB | FL_SET_CRn}},
 	{32,  &JitArm64::FallBackToInterpreter},    //"cmpl",   OPTYPE_INTEGER, FL_IN_AB | FL_SET_CRn}},
-	{26,  &JitArm64::FallBackToInterpreter},    //"cntlzwx",OPTYPE_INTEGER, FL_OUT_A | FL_IN_S | FL_RC_BIT}},
+	{26,  &JitArm64::cntlzwx},                  //"cntlzwx",OPTYPE_INTEGER, FL_OUT_A | FL_IN_S | FL_RC_BIT}},
 	{922, &JitArm64::extsXx},                   //"extshx", OPTYPE_INTEGER, FL_OUT_A | FL_IN_S | FL_RC_BIT}},
 	{954, &JitArm64::extsXx},                   //"extsbx", OPTYPE_INTEGER, FL_OUT_A | FL_IN_S | FL_RC_BIT}},
 	{536, &JitArm64::FallBackToInterpreter},    //"srwx",   OPTYPE_INTEGER, FL_OUT_A | FL_IN_B | FL_IN_S | FL_RC_BIT}},