isnan and isinf implementation

Added the missing implementation for isinf and isnan.

Change-Id: Ice603956a4ed8ef9515ae8f501b2876ce5fab584
Reviewed-on: https://swiftshader-review.googlesource.com/13608
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

src/Reactor/LLVMReactor.cpp

diff --git a/src/Reactor/LLVMReactor.cpp b/src/Reactor/LLVMReactor.cpp
index 8a4ba2f..fd99bf1 100644
--- a/src/Reactor/LLVMReactor.cpp
+++ b/src/Reactor/LLVMReactor.cpp
@@ -5791,6 +5791,16 @@
 		return RValue<Int4>(Nucleus::createSExt(Nucleus::createFCmpOGT(x.value, y.value), Int4::getType()));
 	}
 
+	RValue<Int4> IsInf(RValue<Float4> x)
+	{
+		return CmpEQ(As<Int4>(x) & Int4(0x7FFFFFFF), Int4(0x7F800000));
+	}
+
+	RValue<Int4> IsNan(RValue<Float4> x)
+	{
+		return ~CmpEQ(x, x);
+	}
+
 	RValue<Float4> Round(RValue<Float4> x)
 	{
 		if(CPUID::supportsSSE4_1())