First, let me begin by saying that compiler switches are mainly targeted for specific processors (not operating systems).
VTune™ Amplifier XE Call Stack Pane
“Why Should I Update GCC x86 Compiler?” or “GCC Compiler Performance on Intel® Atom™ from Version to Version”
I’ll try to figure out what is new for Intel® Atom™ architecture in new versions of GCC and how this affects performance and code size on the well-known EEMBC CoreMark* benchmark:
We had an ask from one of the various "Birds of a Feather" meetings Intel® holds at venues such as at the Super Computing* (SC) and International Super Computing* (ISC) conferences.
Diagnostic 15523: Loop was not vectorized: cannot compute loop iteration count before executing the loop.
Product Version: Intel(R) Visual Fortran Compiler XE 15.0 or a later version
Product Version: Intel® Fortran Compiler 15.0 and above