The default FPU precision on Linux* and Mac OS* is a 64-bit significant. This equates to the compiler switch -pc80. The corresponding setting on Windows* is a 53-bit significant, equivalent compiler switch -Qpc64. This difference may account for a variation in results when comparing execution of identical programs/algorithms on Linux/Mac OS* and Windows.
Intel® Fortran Compiler - Default floating point precision differs between Linux*/Mac OS* and Windows*
For more complete information about compiler optimizations, see our Optimization Notice.