On Thu, Aug 16, 2012 at 8:15 AM, Xin Tong <xerox.time.tech@xxxxxxxxx> wrote: > are these options enabled on production build, i.e. build i install > with apt-get install gcc on ubuntu ? Yes. Ian > 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
