Re: Linux 3.1-rc9

[H. Peter Anvin]

On 10/17/2011 11:49 AM, Ingo Molnar wrote:
> Do we have some hard data on this, which we could put into comments 
> in include/linux/ktime.h and such? Older versions of GCC used to do a 
> bad job of long long handling on 32-bit systems - that might be a 
> factor in the performance figures.
> 
> But i suspect you are right that the cost is still very much there 

64/64 division is done bit by bit on most (all?) 32-bit architectures.

64/32 division can be done in hardware on some architectures, e.g. x86.

	-hpa
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