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From: "Roine Gustafsson" <roine@users.sourceforge.net>
Subject: RE: [Qemu-devel] Re: Performances on Mac OS X
Date: Wed, 4 Aug 2004 20:50:59 +0200
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To: qemu-devel@nongnu.org


Joshua Root [z3022016@student.unsw.edu.au] wrote:
> Laurent Amon <amon@stanfordalumni.org> wrote:
>=20
> >I was wondering whether the implementation of qemu is tied to gcc or
> >if it might
> >be interesting to try to compile using IBM's compiler, which is able=20
> >to generate
> >Altivec code...
>=20
> I have tried compiling qemu with xlc and it chokes on the asm. I=20
> believe that it uses a different syntax than gcc for this. I don't=20
> know what its syntax is, but if anybody does it shouldn't be too hard=20
> to make a patch which lets it compile.
>=20
> Using xlc does seem to give substantially better performance than=20
> gcc, and not just on floating point code.
>=20

xlc is picky with the source and takes FOREVER to compile with -O6. =
However,
xlc is object compatible with gcc, so usually you just use xlc on core =
stuff
that needs the speed, and gcc for everything else.
Compile everything with gcc, rm the object files you want to remake with =
xlc
(based on profiling), edit the makefiles to use xlc and make again.=20

  /Roine