SpirvShader: Implement GLSLstd450Tan

src/Pipeline/SpirvShader.cpp

@@ -3302,6 +3302,15 @@ namespace sw
 			}
 			break;
 		}
+		case GLSLstd450Tan:
+		{
+			auto radians = GenericValue(this, routine, insn.word(5));
+			for (auto i = 0u; i < type.sizeInComponents; i++)
+			{
+				dst.move(i, Tan(radians.Float(i)));
+			}
+			break;
+		}
 		default:
 			UNIMPLEMENTED("Unhandled ExtInst %d", extInstIndex);
 		}

src/Reactor/LLVMReactor.cpp

@@ -556,6 +556,13 @@ namespace rr
 			func_.emplace("fmodf", reinterpret_cast<void*>(fmodf));
 			func_.emplace("sinf", reinterpret_cast<void*>(sinf));
 			func_.emplace("cosf", reinterpret_cast<void*>(cosf));
+
+#ifdef __APPLE__
+			// LLVM uses this function on macOS for tan.
+			func_.emplace("sincosf_stret", reinterpret_cast<void*>(__sincosf_stret));
+#elif defined(__linux__)
+			func_.emplace("sincosf", reinterpret_cast<void*>(sincosf));
+#endif // __APPLE__
 		}
 
 		void *findSymbol(const std::string &name) const
@@ -3077,6 +3084,11 @@ namespace rr
 		return RValue<Float4>(V(::builder->CreateCall(func, V(v.value))));
 	}
 
+	RValue<Float4> Tan(RValue<Float4> v)
+	{
+		return Sin(v) / Cos(v);
+	}
+
 	Type *Float4::getType()
 	{
 		return T(llvm::VectorType::get(T(Float::getType()), 4));

src/Reactor/Reactor.hpp

@@ -2210,6 +2210,7 @@ namespace rr
 	// TODO: Currentlhy unimplemented for Subzero.
 	RValue<Float4> Sin(RValue<Float4> x);
 	RValue<Float4> Cos(RValue<Float4> x);
+	RValue<Float4> Tan(RValue<Float4> x);
 
 	template<class T>
 	class Pointer : public LValue<Pointer<T>>