Bits rotations

[H. S. Teoh]

On Thu, Oct 18, 2012 at 04:55:38AM +0200, Adam D. Ruppe wrote:
> On Thursday, 18 October 2012 at 02:36:59 UTC, bearophile wrote:
> >uint foo(in uint x) pure nothrow {
> >    return (x << 11) | (x >> (32 - 11));
> >}
> 
> Why would you write that instead of using rol(x, 11) today?
> 
> uint rol(in uint x, in uint y) pure nothrow {
>     return (x << y) | (x >> (32 - y));
> }
[...]
> Perhaps we should add that rol function to the stdlib to save people
> from quickly doing it themselves, but there's no need to do anything
> beyond this simple function.

+1, add this to core.bitop.


T

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