On Tue, Oct 10, 2006 at 06:04:53PM +0200, Franck Bui-Huu wrote: > ok, and does the trick on KSEG0/XKPHYS really worth ? I mean what is > the size code gain ? Gcc / gas generate a 6 instruction sequence to load something from a 64-bit address, basically lui, add, dsll16, add, dsll16, add. It's just 2 instructions for 32-bit addresses. This boils down to space savings in the hundred of kilobytes for a kernel. Of course there are more intelligent way to load an address via global pointer optimization but that's the two choices we got today. Ralf
