Re: [PATCH] trivial, document that div64_u64() is not precise on32bit platforms

[Ben Woodard]

Andrew,

On Tue, 2010-08-03 at 15:28 -0700, Andrew Morton wrote:
> Well that was a bit lazy of us - I wonder how hard it is to fix.
> 
> At present people will test their code on 64-bit only to find out
> later
> that it doesn't work correctly on 32-bit.  Bad.  Perhaps we should
> similarly break the 64-bit version :)

I just talked to Brian. He's got an implementation that does the
division correctly. He's going to clean it up and send you a patch so
that it will work without losing precision on both 32b and 64b. It is
based upon public domain code from  http://www.hackersdelight.org and
has been proven to be correct in all cases.

-ben


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