Re: 96-bit integer modulo, Athlon64 gcc 64-bit integers, libc codefor 64-bit division, etc.

Christian Bau <christian.bau@cbau.freeserve.co.uk>
14 May 2005 16:48:19 -0400

          From comp.compilers

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From: Christian Bau <christian.bau@cbau.freeserve.co.uk>
Newsgroups: comp.compilers
Date: 14 May 2005 16:48:19 -0400
Organization: Compilers Central
References: 05-05-063 05-05-082
Keywords: arithmetic, performance

  anton@mips.complang.tuwien.ac.at (Anton Ertl) wrote:


> Similarly, for the 64-bit features of the G5 you need an OS capable of
> running 64-bit binaries, i.e., either MacOS X 10.4 or Linux-ppc64
> (Gentoo, Yellowdog, and an unofficial Debian port support this
> architecture).


I haven't tried it myself, but gcc should be able to produce leaf
functions using 64 bit instructions on MacOS X 10.3 as well. The
processor doesn't actually run in 64 bit mode, still in 32 bit mode,
but most operations are 64 bit anyway (except memory addresses).


In this case, a leaf function would be enough.


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