Messages in this thread | | | Date | Mon, 26 Feb 2007 17:20:34 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [RFC] div64_64 support |
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Stephen Hemminger wrote: > > Hmm. Those are the GCC internal versions, that are picked up but > doing divide in place. Do we want to allow general 64 bit in kernel to > be easily used? It could cause sloppy slow code, but it would look > cleaner. >
... and it would handle datatypes which may be architecture-dependent a lot cleaner.
I thought the motivation for div64() was that a 64:32->32 divide could be done a lot faster on a number of platforms (including the important x86) than a generic 64:64->64 divide, but gcc doesn't handle the devolution automatically -- there is no such libgcc function.
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