Messages in this thread |  | | Subject | Re: gcc 2.95 vs 3.21 performance | From | "Timothy D. Witham" <> | Date | 04 Feb 2003 13:44:48 -0800 |
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On Tue, 2003-02-04 at 12:45, Herman Oosthuysen wrote: > Hi there, > > From my experience, the speed issue is caused by misalligned memory > accesses, causing inefficient SDRAM to Cache movement of data and > instructions. > > I don't think that you necessarily need a modification to the compiler. > What you can do is carefully place the ALLIGN switch in a few critical > places in the kernel code, to ensure that the code and data will be > properly alligned for whatever processor it is compiled for, be that a > Pentium, an ARM, a MIPS or whatever. >
I guess I would like the compiler to do that without having to go in and futz the code.
> It would be nice if GCC can be suitably improved to do this correcly for > all architectures, but a little bit of human help can do wonders, > without having to fork the GCC project. > > Cheers, -- Timothy D. Witham - Lab Director - wookie@osdlab.org Open Source Development Lab Inc - A non-profit corporation 15275 SW Koll Parkway - Suite H - Beaverton OR, 97006 (503)-626-2455 x11 (office) (503)-702-2871 (cell) (503)-626-2436 (fax)
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