[ARM32] cntlzwx optimization if source is immediate

2014-11-29 04:21:13 +00:00 · 2014-11-29 04:21:13 +00:00 · 581ab9edec
parent 9c82adb14f
commit 581ab9edec
1 changed files with 8 additions and 0 deletions
--- a/Source/Core/Core/PowerPC/JitArm32/JitArm_Integer.cpp
+++ b/Source/Core/Core/PowerPC/JitArm32/JitArm_Integer.cpp
@ -723,6 +723,14 @@ void JitArm::cntlzwx(UGeckoInstruction inst)
 	JITDISABLE(bJITIntegerOff);
 	u32 a = inst.RA, s = inst.RS;

+	if (gpr.IsImm(s))
+	{
+		gpr.SetImmediate(a, __builtin_clz(gpr.GetImm(s)));
+		if (inst.Rc)
+			ComputeRC(gpr.GetImm(a), 0);
+		return;
+	}
+
 	gpr.BindToRegister(a, a == s);
 	ARMReg RA = gpr.R(a);
 	ARMReg RS = gpr.R(s);