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Re: [PATCH] round-ash, a rounding arithmetic shift operator

From: Andy Wingo
Subject: Re: [PATCH] round-ash, a rounding arithmetic shift operator
Date: Sun, 20 Feb 2011 23:06:05 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux)

On Tue 15 Feb 2011 10:49, Mark H Weaver <address@hidden> writes:

> The first patch is trivial, but there for the sake of correctness.

Please apply, thanks.

> The second patch adds round-ash, a rounding arithmetic shift operator.
>   (round-ash n count) ==> (round (* n (expt 2 count)))
> but it's implemented much more efficiently than that, and requires that
> both n and count are exact integers.  It cannot be implemented very
> efficiently in scheme, and I needed it to normalize floating-point
> significands using the default IEEE rounding mode.  I think it probably
> has wider utility.  It would be great to have it in 2.0.  Any chance?

I'm not sure I understand the name.  There is no need to call "round" on
the result of calling "ash".  Can you think of another name?



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