On Mon, Jan 24, 2011 at 12:55:59PM -0500, Bill Nottingham wrote: > Jakub Jelinek (jakub@xxxxxxxxxx) said: > > On Mon, Jan 24, 2011 at 09:25:45AM -0800, John Reiser wrote: > > > Actually many of them should be using the new x86_32 software architecture, > > > which is the 64-bit instruction set (thus 16 "general" registers, SSE, ...) > > > but with integers, longs, and pointers all 32 bits. The upper 32 bits > > > of any user address are 0, and not stored in RAM (except the return address > > > of CALL.) This gives a measurable benefit on boxes with low RAM. > > > > Except that such a model is only barely supported in binutils, the support > > for it in gcc is pre-alpha state on a branch and there is no kernel nor > > glibc support. > > Am I missing something, or would this also be binary-incompatible? If so, > that's very very very much not worth the effort. Yes, it is ABI incompatible, not sure what made hjl start with that now and trying to push x86_64 into Irixy shape with 3 multilibs instead of 2. I vaguely remember we've talked about it a decade ago and decided it was not worth the effort. Jakub -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
