Hi, On Thu, 1 Jun 2006 00:51:47 +0930 Raymond Lewis Rebbeck <[EMAIL PROTECTED]> wrote:
> On Thursday, 1 June 2006 0:38, Hemmann, Volker Armin wrote: > > > > Also -ftracer is not in the safe cflags list, personally I would not > > > > use it but if you believe it benefits you then go ahead. > > > > > > Another handy tip. Can't remember why I had it (did the "research" when > > > I reinstalled it 32bit). I'll remove it too. > > > > ftracer is harmless. > > From man gcc: > > -ftracer > > Perform tail duplication to enlarge superblock size. This > > trans- formation simplifies the control flow of the function allowing other > > optimizations to do better job. > > If it was harmless and beneficial it'd already be included in an -O? level. Probably. And it seems to be only of interest when using -fsched2-use-superblocks or -fsched2-use-traces. The man page entry for the further (included in the latter) option says: "This option is experimental, as not all machine descriptions used by GCC model the CPU closely enough to avoid unreliable results from the algorithm." -hwh -- gentoo-user@gentoo.org mailing list
