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? Here's why I ask. I have done some experimentation and concluded that my video card is not the source of my performance problems with X. (Running programs over an ssh X tunnel from my laptop -- even over 11Mbps wireless networking -- is noticably faster than running the same programs on my 164LX directly.) Also, my Alpha's performance in X is a lot slower than a 700MHz PC I have sitting around (that PC also supports only PCI cards), despite the fact that just about everything about the Alpha is faster (10,000RPM UW SCSI disks in RAID-0 vs. single 7500RPM IDE drive, etc, etc.) I'm hoping that optimizing programs for the Alpha will help. 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. -- John
