Prevent FP contractions to FMA in index/detail/algorithms/content.hpp to fix #1452 on GCC with x86-64-v3.

Author: tinko92

include/boost/geometry/index/detail/algorithms/content.hpp

@@ -16,6 +16,8 @@
 #ifndef BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_CONTENT_HPP
 #define BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_CONTENT_HPP
 
+#include <boost/config.hpp>
+
 #include <boost/geometry/core/access.hpp>
 #include <boost/geometry/core/coordinate_dimension.hpp>
 #include <boost/geometry/core/coordinate_type.hpp>
@@ -26,6 +28,11 @@
 
 namespace boost { namespace geometry { namespace index { namespace detail {
 
+#if defined(BOOST_GCC)
+#pragma GCC push_options
+#pragma GCC optimize ("fp-contract=off")
+#endif
+
 template <typename Indexable>
 struct default_content_result
 {
@@ -98,6 +105,10 @@ typename default_content_result<Indexable>::type content(Indexable const& b)
             >::apply(b);
 }
 
+#if defined(BOOST_GCC)
+#pragma GCC pop_options
+#endif
+
 }}}} // namespace boost::geometry::index::detail
 
 #endif // BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_CONTENT_HPP