Hi everybody,
do you know which optimizations are included in -fast and -O3 options?
Thanks!
Hi Prado,
“-fast” is an aggregate flag composed of several optimizations. While the exact optimizations can change from platform to platform and release to release (See the output of “pgfortran -help -fast” for the listing on your system), in 10.5 on a 64-bit Linux system, “-fast” consists of “-O2 -Munroll=c:1 -Mnoframe -Mlre -Mautoinline -Mvect=sse -Mscalarsse -Mcache_align -Mflushz -Mpre”. For specifics on each of these optimizations, please refer to the PGI User’s guide.
- Mat