On Wed, Aug 15, 2012 at 8:58 PM, Xin Tong <xerox.time.tech@xxxxxxxxx> wrote: > I sometimes run into issues where i want to figure out why gcc is > performing a specific optimization and what the optimization affects > the tree. is there any documents on how to print gcc optimizations and > code generation logs ? Unfortunately GCC has very little in the way of logs intended for end users. About all I know is the -ftree-vectorizer-verbose information, which gives useful feedback about the vectorization optimizations. You can a lot of information by using -fdump-tree-all-details -fdump-rtl-all-details, but it's difficult to interpret without the source code and a working knowledge of GCC internals. Ian
