From 487edbf325d6c64fad23bc93bb425be408098927 Mon Sep 17 00:00:00 2001
From: Benoit Jacob <jacob.benoit.1@gmail.com>
Date: Mon, 4 May 2009 12:14:37 +0000
Subject: [PATCH] backport 963281, fix msvc detection on win64

---
 Eigen/Core | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/Eigen/Core b/Eigen/Core
index 211e0f9c7..f5e315a2c 100644
--- a/Eigen/Core
+++ b/Eigen/Core
@@ -7,11 +7,10 @@
 #ifdef _MSC_VER
   #include <malloc.h> // for _aligned_malloc -- need it regardless of whether vectorization is enabled
   #if (_MSC_VER >= 1500) // 2008 or later
-    // Remember that usage of defined() in a #define is undefined by the standard
-    #ifdef _M_IX86_FP
-      #if _M_IX86_FP >= 2
-        #define EIGEN_SSE2_ON_MSVC_2008_OR_LATER
-      #endif
+    // Remember that usage of defined() in a #define is undefined by the standard.
+    // a user reported that in 64-bit mode, MSVC doesn't care to define _M_IX86_FP.
+    #if (defined(_M_IX86_FP) && (_M_IX86_FP >= 2)) || defined(_M_X64)
+      #define EIGEN_SSE2_ON_MSVC_2008_OR_LATER
     #endif   
   #endif
 #endif