I've found that in 'opt' command, the list of transformation passes used for -O0,-O1,-O2 and -O3, is a reduced subset from the list of all the available passes available in 'opt' command. So, I have couple of questions regarding that: - How is defined the subset of passes/flags used for -O0,-O1,-O2 and -O3 - And how to know which flags to discard from the whole list of passes available in 'opt' , as the flags of the family “X86” and more of this David -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20191001/5c43e0f4/attachment.html>