On Tue, Dec 02, 2003 at 08:20:53AM -0600, John Goerzen wrote: > On Tue, Dec 02, 2003 at 02:40:54AM -0800, Phil Carmody wrote: > > --- John Goerzen <[EMAIL PROTECTED]> wrote: > > > I'm interested in how ccc and gcc compare today wrt speed of generated > > > code on Alpha. Is gcc 3.3 as good as ccc? > > > > For 21164s, building Dan Bernstein's DJBFFT library, ccc produces > > noticably faster code than gcc-3.3. At least 5% faster across the > > board, up to 50% faster for some functions. > > Does this hold even for things that are not directly math-related?
IIRC, it does NOT hold for normal/integer stuff, as GCC seems to hold it's own in those areas. > I'm using apt-build right now to build some key libraries with > -mcpu=ev56 -O3 and hope that'll do the trick, but at the same time, I'm > wondering if ccc would do better -- and how easy it is to use it in > place of gcc. Yes, rebuilding key libraries, as well as the kernel, for a specific CPU/platform should help a good bit, if my results of a small GENTOO install are any indication... But, CCC is difficult, if not impossible, to use on some packages, notably GLIBC and XFree86, as best I can remember. Good luck. --Jay++ ----------------------------------------------------------------------------- Jay A Estabrook HPTC - LINUX support Hewlett-Packard Company - MRO1-2/K15 (508) 467-2080 200 Forest Street, Marlboro MA 01752 [EMAIL PROTECTED] -----------------------------------------------------------------------------
