Thanks, but I had to recompile gcc for the F16C intrinsic support. After that for compiling the programs -mf16c does the trick. Vox On 26 July 2015 at 20:41, Jeff Epler <jepler@xxxxxxxxxxxxxx> wrote: > It looks like, depending on your compiler you may need to include > -mf16c, or a -march= that implies -mf16c, in your compiler flags (e.g., > -march=haswell). > > Jeff