diff --git a/glm/detail/setup.hpp b/glm/detail/setup.hpp
index 1d6ffca1..9c7f209e 100644
--- a/glm/detail/setup.hpp
+++ b/glm/detail/setup.hpp
@@ -423,8 +423,14 @@
 #		define GLM_ARCH (GLM_ARCH_AVX2 | GLM_ARCH_AVX | GLM_ARCH_SSE4 | GLM_ARCH_SSE3 | GLM_ARCH_SSE2)
 #	elif defined(__AVX__)
 #		define GLM_ARCH (GLM_ARCH_AVX | GLM_ARCH_SSE4 | GLM_ARCH_SSE3 | GLM_ARCH_SSE2)
-#	elif _M_IX86_FP == 2
+#	elif defined(_M_X64)
 #		define GLM_ARCH (GLM_ARCH_SSE2)
+#	elif defined(_M_IX86_FP)
+#		if _M_IX86_FP >= 2
+#			define GLM_ARCH (GLM_ARCH_SSE2)
+#		else
+#			define GLM_ARCH (GLM_ARCH_PURE)
+#		endif
 #	else
 #		define GLM_ARCH (GLM_ARCH_PURE)
 #	endif
diff --git a/readme.md b/readme.md
index cf93b453..16944885 100644
--- a/readme.md
+++ b/readme.md
@@ -54,6 +54,8 @@ glm::mat4 camera(float Translate, glm::vec2 const & Rotate)
 #### [GLM 0.9.7.5](https://github.com/g-truc/glm/tree/0.9.7) - 2016-0X-XX
 ##### Fixes:
 - Fixed uaddCarry warning #497
+- Fixed roundPowerOfTwo and floorPowerOfTwo #503
+- Fixed Visual C++ SIMD instruction set automatic detection in 64 bits
 
 #### [GLM 0.9.7.4](https://github.com/g-truc/glm/releases/tag/0.9.7.4) - 2016-03-19
 ##### Fixes: