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

glen herrmannsfeldt <gah@ugcs.caltech.edu>
15 May 2005 00:27:36 -0400

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From: glen herrmannsfeldt <gah@ugcs.caltech.edu>
Newsgroups: comp.compilers
Date: 15 May 2005 00:27:36 -0400
Organization: Compilers Central
References: 05-05-063 05-05-082 05-05-098
Keywords: arithmetic, practice
Posted-Date: 15 May 2005 00:27:36 EDT

Christian Bau wrote:


(snip)


> 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,


Does the OS save the full 64 bit registers when not in 64 bit mode?


Otherwise you could get the wrong result on a task switch.


-- glen

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