diff --git a/src/Reactor/LLVMReactor.cpp b/src/Reactor/LLVMReactor.cpp
index c04b300..e65f3fa 100644
--- a/src/Reactor/LLVMReactor.cpp
+++ b/src/Reactor/LLVMReactor.cpp
@@ -567,6 +567,7 @@
 			func_.emplace("atanhf", reinterpret_cast<void*>(atanhf));
 			func_.emplace("atan2f", reinterpret_cast<void*>(atan2f));
 			func_.emplace("powf", reinterpret_cast<void*>(powf));
+			func_.emplace("expf", reinterpret_cast<void*>(expf));
 
 #ifdef __APPLE__
 			// LLVM uses this function on macOS for tan.
@@ -3182,6 +3183,12 @@
 		return RValue<Float4>(V(::builder->CreateCall(func, { V(x.value), V(y.value) })));
 	}
 
+	RValue<Float4> Exp(RValue<Float4> v)
+	{
+		auto func = llvm::Intrinsic::getDeclaration(::module, llvm::Intrinsic::exp, { T(Float4::getType()) } );
+		return RValue<Float4>(V(::builder->CreateCall(func, { V(v.value) })));
+	}
+
 	Type *Float4::getType()
 	{
 		return T(llvm::VectorType::get(T(Float::getType()), 4));