On Mon, Sep 30, 2013 at 02:11:11PM +0530, km wrote: > Dear All, > > I have seen this -O4 optimization being used in latest c/c++ soursecode but > find no documentation on the use of O4 over O3 level. > Can someone comment on this. Does it improve runtime performance over O3 ?
Anything beyond -O3 has no effect other than -O3's effect. You can check these options at the source: http://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/opts.c#l471 Kumar -- : ####[ GNU/Linux One Stanza Tip (LOST) ]####################### Sub : Database de-limiter exchange LOST #030 To convert a comma delimited database file with a file which is tab delimited: $tr ',' '\t' < file > newfile ####[usmbish (at) users.sourceforge.net]###################### : _______________________________________________ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc ILUGC Mailing List Guidelines: http://ilugc.in/mailinglist-guidelines
