are these options enabled on production build, i.e. build i install with apt-get install gcc on ubuntu ? Xin On Wed, Aug 15, 2012 at 10:21 PM, Ian Lance Taylor <iant@xxxxxxxxxx> wrote: > 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
