BUG: fix sse test for msvc, gnu, clang

otbsiftfast was enabling /fp:fast option with msvc along with SSE.
This is not normal as MSDN docs doesn't mention anything about /fp:fast
when using /arch:SSE.

I think it has a problematic behaviour with otb's dashboard
testing. Many --compare-image tests we do are with zero tolerance.
So it has to go.

CMake/OTBCheckSSEFeatures.cmake

@@ -8,28 +8,42 @@ function(check_sse_features sse_flags )
       message(STATUS "For apple assume sse2 is on for all intel builds")
     return()
   endif()
-
-  if( CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX )
+  set(sse_flags_detected)
+  if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLANG)
     set(CMAKE_REQUIRED_FLAGS "-msse2")
-    check_cxx_source_runs("
+    set(sse_flags_detected "-msse2 -mfpmath=sse")
+  elseif(MSVC AND NOT CMAKE_CL_64)
+    set(CMAKE_REQUIRED_FLAGS "/arch:SSE2")
+    set(sse_flags_detected "/arch:SSE2")
+  endif()
+
+  check_cxx_source_runs("
     #include <emmintrin.h>
-    int main()
+    int main ()
     {
-        __m128d a, b;
-        double vals[2] = {0};
-        a = _mm_loadu_pd(vals);
-        b = _mm_add_pd(a,a);
-        _mm_storeu_pd(vals,b);
-        return 0;
-     }" HAVE_SSE2_FLAGS)
- 
-    if(HAVE_SSE2_FLAGS)
-      set(${sse_flags} "-msse2 -mfpmath=sse" PARENT_SCOPE)
-      return()
-    endif()
+     __m128d a, b;
+     double vals[2] = {0};
+     a = _mm_loadu_pd (vals);
+     b = _mm_add_pd (a,a);
+     _mm_storeu_pd (vals,b);
+     return (0);
+    }"
+    HAVE_SSE2_EXTENSIONS)
+
+  if(HAVE_SSE2_EXTENSIONS)
+    set(${sse_flags} "${sse_flags_detected}" PARENT_SCOPE)
+    return()
+  endif()
 
+  if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLANG)
     set(CMAKE_REQUIRED_FLAGS "-msse")
-    check_cxx_source_runs("
+    set(sse_flags_detected "-msse -mfpmath=sse")
+  elseif(MSVC AND NOT CMAKE_CL_64)
+    set(CMAKE_REQUIRED_FLAGS "/arch:SSE")
+    set(sse_flags_detected "/arch:SSE")
+  endif()
+
+  check_cxx_source_runs("
     #include <xmmintrin.h>
     int main()
     {
@@ -40,37 +54,10 @@ function(check_sse_features sse_flags )
         b = _mm_add_ps(a,b);
         _mm_storeu_ps(vals,b);
         return 0;
-    }" HAVE_SSE_FLAGS)
-    
-    if(HAVE_SSE_FLAGS)
-      set(${sse_flags} "-msse -mfpmath=sse" PARENT_SCOPE)
-      return()
-    endif()
+    }" HAVE_SSE_EXTENSIONS)
 
-  elseif(MSVC)
-    if(CMAKE_SIZEOF_VOID_P EQUAL 8)
-      return()
-    endif()
-    check_cxx_source_runs("
-      #include <emmintrin.h>
-       
-        int main()
-        {
-          __m128d a, b;
-          double vals[2] = {0};
-          a = _mm_loadu_pd(vals);
-          b = _mm_add_pd(a,a);
-          _mm_storeu_pd(vals,b);
-          return 0;
-        }" HAVE_SSE_FLAGS)
-    
-    if(HAVE_SSE_FLAGS)
-      message(STATUS "Performing Test HAVE_SSE_FLAGS - Success")
-      set(${sse_flags} "/arch:SSE2 /fp:fast -D__SSE__ -D__SSE2__" PARENT_SCOPE)
-      return()
-    else()
-      message(STATUS "Performing Test HAVE_SSE_FLAGS - Failed")
-      return()
-    endif()
-endif()
+  if(HAVE_SSE_EXTENSIONS)
+    set(${sse_flags} "${sse_flags_detected}" PARENT_SCOPE)
+    return()
+  endif()
 endfunction() #check_sse_features