SpirvShader: Implement GLSLstd450Atanh

src/Pipeline/SpirvShader.cpp

@@ -3385,7 +3385,11 @@ namespace sw
 		}
 		case GLSLstd450Atanh:
 		{
-			UNIMPLEMENTED("GLSLstd450Atanh");
+			auto val = GenericValue(this, routine, insn.word(5));
+			for (auto i = 0u; i < type.sizeInComponents; i++)
+			{
+				dst.move(i, Atanh(val.Float(i)));
+			}
 			break;
 		}
 		case GLSLstd450Atan2:

src/Reactor/LLVMReactor.cpp

@@ -564,6 +564,7 @@ namespace rr
 			func_.emplace("tanhf", reinterpret_cast<void*>(tanhf));
 			func_.emplace("asinhf", reinterpret_cast<void*>(asinhf));
 			func_.emplace("acoshf", reinterpret_cast<void*>(acoshf));
+			func_.emplace("atanhf", reinterpret_cast<void*>(atanhf));
 
 #ifdef __APPLE__
 			// LLVM uses this function on macOS for tan.
@@ -3150,6 +3151,11 @@ namespace rr
 		return TransformFloat4PerElement(v, "acoshf");
 	}
 
+	RValue<Float4> Atanh(RValue<Float4> v)
+	{
+		return TransformFloat4PerElement(v, "atanhf");
+	}
+
 	Type *Float4::getType()
 	{
 		return T(llvm::VectorType::get(T(Float::getType()), 4));

src/Reactor/Reactor.hpp

@@ -2219,6 +2219,7 @@ namespace rr
 	RValue<Float4> Tanh(RValue<Float4> x);
 	RValue<Float4> Asinh(RValue<Float4> x);
 	RValue<Float4> Acosh(RValue<Float4> x);
+	RValue<Float4> Atanh(RValue<Float4> x);
 
 	template<class T>
 	class Pointer : public LValue<Pointer<T>>