From 11c8a6bf63a8a47a8c079d7e04aff14047aab223 Mon Sep 17 00:00:00 2001
From: Benoit Jacob <jacob.benoit.1@gmail.com>
Date: Mon, 15 Dec 2008 16:14:54 +0000
Subject: [PATCH] Fix detection of SSE2 with MSVC.

---
 Eigen/Core | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Eigen/Core b/Eigen/Core
index 3128f3198..08044f2ec 100644
--- a/Eigen/Core
+++ b/Eigen/Core
@@ -12,7 +12,9 @@
 #endif
 
 #ifndef EIGEN_DONT_VECTORIZE
-  #if (defined __SSE2__) && ( (!defined __GNUC__) || EIGEN_GNUC_AT_LEAST(4,2) )
+  #define EIGEN_HAVE__SSE2__BUT_NOT_OLD_GCC ((defined __SSE2__) && ( (!defined __GNUC__) || EIGEN_GNUC_AT_LEAST(4,2) ))
+  #define EIGEN_HAVE_MSVC_SSE2 (defined(_M_IX86_FP) && (_M_IX86_FP >= 2))
+  #if (EIGEN_HAVE__SSE2__BUT_NOT_OLD_GCC || EIGEN_HAVE_MSVC_SSE2)
     #define EIGEN_VECTORIZE
     #define EIGEN_VECTORIZE_SSE
     #include <emmintrin.h>