[RFC PATCH]: Reciprocal sqrt (rsqrt) conversion pass

[Toon Moene]

Uros Bizjak wrote:

> On 6/13/07, Richard Guenther <rguenther@suse.de> wrote:

>> > But anyway, the caclulation goes _much_ faster.
>>
>> Heh - that's easy with a wrong result ;)
> 
> That is what you get with 12bit precision. But it will be fixed on the
> target level with NR step. This is also the reason, why we have to
> expand NR-step at RTL.

[ I know, way, way too late: ]

Those who ignore Cray are doomed to re-implement it, poorly.

[ Sorry, couldn't resist ]

-- 
Toon Moene - e-mail: toon@moene.indiv.nluug.nl - phone: +31 346 214290
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Who's working on GNU Fortran: 
http://gcc.gnu.org/ml/gcc/2007-01/msg00059.html