Hello everyone I have few questions regarding loop unrolling and the effect of flags (provided at command line) on the execution of passes. Is it possible to do loop unrolling without using -O3, -O2 and -O1? The -Q -O3 --help=optimizers options provides us the list of enabled and disabled optimizations at -O3 level. If I specify -O3 to compile any file then the total number of passes executed are around 182. And If I manually specify all the optimization which are enabled at -O3 (without specifying -O3 actually), we get the total number of passes as 64. So, my question is that why is there a difference of passes between these two cases? And while specifying all enabled optimizations (at -O3) along with -funroll-all-loops, I am unable to do the unrolling, while the same program is unrolled if we specify -O3 along with -funroll-all-loops. Best regards Memon
