------- Comment #50 from dnovillo at google dot com 2008-05-02 12:32 ------- Subject: Re: [4.3/4.4 Regression] Revision 126326 causes 12% slowdown
On 05/02/08 08:16, rguenth at gcc dot gnu dot org wrote: > and dropping the final dom pass in favor of another FRE one (DOM has > weaker memory optimization but in addition does some jump threading and > cond expr combining, both of which don't happen a lot after loop > optimizations). Along these lines, I think we would really benefit from doing a thorough study of pass reordering using the techniques in GCC-ICI (GCC Summit 2008) and COLE (CGO 2008). Both have found significant improvements with different optimization pipelines. > Note that teaching DOM about the alias-oracle is very difficult and > unlikely to happen - I'd rather get rid of DOM completely. Agreed. Diego. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32921