On Fri, 2009-02-27 at 22:07 +0100, Arnaud Patard wrote: > Laurent GUERBY <[email protected]> writes: > > On debian lenny I'm playing with GCC trunk (4.4) to build a tri-ABI > > compiler on a lemote netbook (running gnewsense kernel and lenny > > userspace). > > > > My understanding is that lenny userspace is -mabi=32 (o32) and > > GCC and libc support abi=32,n32,64, the kernel being 64. > > > > n32 seems to be more performant than 32, > > fwiw, it would be also interesting to compare o32 with -march=mips3 with > n32. I'm not sure that in such kind of case the differences will be > big.
Looks like on lenny userspace binaries are compiled for MIPS-I whereas on Mandriva (gdium) there are MIPS-III. I'll do some testing when I get my 4.4 tri-ABI compiler working, thanks for the hint. > > do you know why it is not used by default? > > I think only irix is using it by default :) > As regards linux, imho, nobody's using it due to the amount of bugs > hidden waiting for a fix (this is a guess, maybe there are better > reason). Do you know of specific GCC open PR against n32? GCC bugzilla search for target mips returns only 30 PR most of them are not wrong code. > > Is it unsupported on some hardware? > > iirc you need mips3 or newer ISA. I'm not sure that there are 64bit > mips not fitting in this category. May be debian is targeting hardware < mips3? Laurent -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
