diff --git a/glm/detail/intrinsic_geometric.inl b/glm/detail/intrinsic_geometric.inl
index 9411e908..c12aa5ea 100644
--- a/glm/detail/intrinsic_geometric.inl
+++ b/glm/detail/intrinsic_geometric.inl
@@ -48,7 +48,7 @@ GLM_FUNC_QUALIFIER __m128 sse_dst_ps(__m128 p0, __m128 p1)
 //dot
 GLM_FUNC_QUALIFIER __m128 sse_dot_ps(__m128 v1, __m128 v2)
 {
-#   if((GLM_ARCH & GLM_ARCH_SSE4) == GLM_ARCH_SSE4)
+#   if(GLM_ARCH & GLM_ARCH_AVX)
         return _mm_dp_ps(v1, v2, 0xff);
 #   else
         __m128 mul0 = _mm_mul_ps(v1, v2);
diff --git a/glm/detail/setup.hpp b/glm/detail/setup.hpp
index 2647d5e3..e89a2058 100644
--- a/glm/detail/setup.hpp
+++ b/glm/detail/setup.hpp
@@ -520,6 +520,13 @@
 	((GLM_LANG & GLM_LANG_CXX0X_FLAG) && (GLM_COMPILER & GLM_COMPILER_GCC) && (GLM_COMPILER >= GLM_COMPILER_GCC44)) || \
 	__has_feature(cxx_generalized_initializers))
 
+// N2544 Unrestricted unions
+#define GLM_HAS_UNRESTRICTED_UNIONS ( \
+	(GLM_LANG & GLM_LANG_CXX11_FLAG) || \
+	(GLM_LANG & GLM_LANG_CXXMS_FLAG) || \
+	((GLM_LANG & GLM_LANG_CXX0X_FLAG) && (GLM_COMPILER & GLM_COMPILER_GCC) && (GLM_COMPILER >= GLM_COMPILER_GCC46)) || \
+	__has_feature(cxx_unrestricted_unions))
+
 // OpenMP
 #ifdef _OPENMP 
 #	if(GLM_COMPILER & GLM_COMPILER_GCC)
@@ -545,14 +552,13 @@
 /////////////////
 // Platform 
 
-// User defines: GLM_FORCE_PURE GLM_FORCE_SSE2 GLM_FORCE_AVX
+// User defines: GLM_FORCE_PURE GLM_FORCE_SSE2 GLM_FORCE_SSE3 GLM_FORCE_AVX GLM_FORCE_AVX2
 
 #define GLM_ARCH_PURE		0x0000
 #define GLM_ARCH_SSE2		0x0001
 #define GLM_ARCH_SSE3		0x0002// | GLM_ARCH_SSE2
-#define GLM_ARCH_SSE4		0x0004// | GLM_ARCH_SSE3 | GLM_ARCH_SSE2
-#define GLM_ARCH_AVX		0x0008// | GLM_ARCH_SSE4 | GLM_ARCH_SSE3 | GLM_ARCH_SSE2
-#define GLM_ARCH_AVX2		0x0010// | GLM_ARCH_AVX | GLM_ARCH_SSE4 | GLM_ARCH_SSE3 | GLM_ARCH_SSE2
+#define GLM_ARCH_AVX		0x0004// | GLM_ARCH_SSE3 | GLM_ARCH_SSE2
+#define GLM_ARCH_AVX2		0x0008// | GLM_ARCH_AVX | GLM_ARCH_SSE3 | GLM_ARCH_SSE2
 
 #if(defined(GLM_FORCE_PURE))
 #	define GLM_ARCH GLM_ARCH_PURE
@@ -560,12 +566,22 @@
 #	define GLM_ARCH (GLM_ARCH_AVX2 | GLM_ARCH_AVX | GLM_ARCH_SSE3 | GLM_ARCH_SSE2)
 #elif(defined(GLM_FORCE_AVX))
 #	define GLM_ARCH (GLM_ARCH_AVX | GLM_ARCH_SSE3 | GLM_ARCH_SSE2)
-#elif(defined(GLM_FORCE_SSE4))
-#	define GLM_ARCH (GLM_ARCH_SSE4 | GLM_ARCH_SSE3 | GLM_ARCH_SSE2)
 #elif(defined(GLM_FORCE_SSE3))
 #	define GLM_ARCH (GLM_ARCH_SSE3 | GLM_ARCH_SSE2)
 #elif(defined(GLM_FORCE_SSE2))
 #	define GLM_ARCH (GLM_ARCH_SSE2)
+#elif((GLM_COMPILER & GLM_COMPILER_CLANG) || (GLM_COMPILER & GLM_COMPILER_GCC))
+#	if(__AVX2__)
+#		define GLM_ARCH (GLM_ARCH_AVX2 | GLM_ARCH_AVX | GLM_ARCH_SSE3 | GLM_ARCH_SSE2)
+#	elif(__AVX__)
+#		define GLM_ARCH (GLM_ARCH_AVX | GLM_ARCH_SSE3 | GLM_ARCH_SSE2)
+#	elif(__SSE3__)
+#		define GLM_ARCH (GLM_ARCH_SSE3 | GLM_ARCH_SSE2)
+#	elif(__SSE2__)
+#		define GLM_ARCH (GLM_ARCH_SSE2)
+#	else
+#		define GLM_ARCH GLM_ARCH_PURE
+#	endif
 #elif((GLM_COMPILER & GLM_COMPILER_VC) && (defined(_M_IX86) || defined(_M_X64)))
 #	if(GLM_PLATFORM == GLM_PLATFORM_WINCE)
 #		define GLM_ARCH GLM_ARCH_PURE
@@ -596,15 +612,6 @@
 #	else
 #		define GLM_ARCH GLM_ARCH_PURE
 #	endif
-#elif((GLM_PLATFORM & GLM_PLATFORM_APPLE) && (GLM_COMPILER & GLM_COMPILER_GCC))
-#	define GLM_ARCH GLM_ARCH_PURE
-#elif(((GLM_COMPILER & GLM_COMPILER_GCC) && (defined(__i386__) || defined(__x86_64__))) || (GLM_COMPILER & GLM_COMPILER_LLVM_GCC))
-#	define GLM_ARCH (GLM_ARCH_PURE \
-| (defined(__AVX2__) ? GLM_ARCH_AVX2 : 0) \
-| (defined(__AVX__) ? GLM_ARCH_AVX : 0) \
-| (defined(__SSE4__) ? GLM_ARCH_SSE4 : 0) \
-| (defined(__SSE3__) ? GLM_ARCH_SSE3 : 0) \
-| (defined(__SSE2__) ? GLM_ARCH_SSE2 : 0))
 #else
 #	define GLM_ARCH GLM_ARCH_PURE
 #endif
@@ -616,7 +623,6 @@
 #	include <intrin.h>
 #endif
 
-//#if(GLM_ARCH != GLM_ARCH_PURE)
 #if(GLM_ARCH & GLM_ARCH_AVX2)
 #	include <immintrin.h>
 #endif//GLM_ARCH
@@ -639,22 +645,19 @@
 		inline __m128 _mm_castsi128_ps(__m128i PI) { union { __m128 ps; __m128i pi; } c; c.pi = PI; return c.ps; }
 #	endif
 #endif//GLM_ARCH
-//#endif//(GLM_ARCH != GLM_ARCH_PURE)
 
 #if(defined(GLM_MESSAGES) && !defined(GLM_MESSAGE_ARCH_DISPLAYED))
 #	define GLM_MESSAGE_ARCH_DISPLAYED
 #	if(GLM_ARCH == GLM_ARCH_PURE)
 #		pragma message("GLM: Platform independent")
-#	elif(GLM_ARCH & GLM_ARCH_SSE2)
-#		pragma message("GLM: SSE2 instruction set")
-#	elif(GLM_ARCH & GLM_ARCH_SSE3)
-#		pragma message("GLM: SSE3 instruction set")
-#	elif(GLM_ARCH & GLM_ARCH_SSE4)
-#		pragma message("GLM: SSE4 instruction set")
-#	elif(GLM_ARCH & GLM_ARCH_AVX)
-#		pragma message("GLM: AVX instruction set")
 #	elif(GLM_ARCH & GLM_ARCH_AVX2)
 #		pragma message("GLM: AVX2 instruction set")
+#	elif(GLM_ARCH & GLM_ARCH_AVX)
+#		pragma message("GLM: AVX instruction set")
+#	elif(GLM_ARCH & GLM_ARCH_SSE3)
+#		pragma message("GLM: SSE3 instruction set")
+#	elif(GLM_ARCH & GLM_ARCH_SSE2)
+#		pragma message("GLM: SSE2 instruction set")
 #	endif//GLM_ARCH
 #	pragma message("GLM: #define GLM_FORCE_PURE to avoid using platform specific instruction sets")
 #endif//GLM_MESSAGE
diff --git a/glm/detail/type_vec4.hpp b/glm/detail/type_vec4.hpp
index 39192c3a..6fc0039c 100644
--- a/glm/detail/type_vec4.hpp
+++ b/glm/detail/type_vec4.hpp
@@ -47,6 +47,28 @@
 namespace glm{
 namespace detail
 {
+	template <typename T>
+	struct simd
+	{
+		typedef T type[4];
+	};
+
+#	if(GLM_ARCH & GLM_ARCH_SSE2)
+		template <>
+		struct simd<float>
+		{
+			typedef __m128 type;
+		};
+#	endif
+
+#	if(GLM_ARCH & GLM_ARCH_AVX)
+		template <>
+		struct simd<double>
+		{
+			typedef __m256d type;
+		};
+#	endif
+	
 	template <typename T, precision P>
 	struct tvec4
 	{
@@ -86,11 +108,25 @@ namespace detail
 				_GLM_SWIZZLE4_4_MEMBERS(T, P, tvec4, s, t, p, q)
 			};
 #		else
-			union { T x, r, s; };
-			union { T y, g, t; };
-			union { T z, b, p; };
-			union { T w, a, q; };
-
+#			if(GLM_HAS_UNRESTRICTED_UNIONS)
+				union
+				{
+					typename simd<T>::type data;
+					struct
+					{
+						union { T x, r, s; };
+						union { T y, g, t; };
+						union { T z, b, p; };
+						union { T w, a, q; };
+					};
+				};
+#			else
+				union { T x, r, s; };
+				union { T y, g, t; };
+				union { T z, b, p; };
+				union { T w, a, q; };
+#			endif
+		
 #			ifdef GLM_SWIZZLE
 				GLM_SWIZZLE_GEN_VEC_FROM_VEC4(T, P, detail::tvec4, detail::tvec2, detail::tvec3, detail::tvec4)
 #			endif
diff --git a/test/gtx/gtx_simd_vec4.cpp b/test/gtx/gtx_simd_vec4.cpp
index 8ce92371..4c40b343 100644
--- a/test/gtx/gtx_simd_vec4.cpp
+++ b/test/gtx/gtx_simd_vec4.cpp
@@ -13,8 +13,30 @@
 
 #if(GLM_ARCH != GLM_ARCH_PURE)
 
+
+struct value
+{
+	value(float x, float y, float z, float w) :
+		x(x), y(y), z(z), w(w)
+	{}
+	
+	union
+	{
+		__m128 data;
+		struct
+		{
+			union { float x, r, s; };
+			union { float y, g, t; };
+			union { float z, b, p; };
+			union { float w, a, q; };
+		};
+	};
+};
+
 int main()
 {
+	value Value(1.0, 0.5, 0.0, 0.7);
+	
 	glm::simdVec4 A1(0.0f, 0.1f, 0.2f, 0.3f);
 	glm::simdVec4 B1(0.4f, 0.5f, 0.6f, 0.7f);
 	glm::simdVec4 C1 = A1 + B1;