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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] some problems with building with AltiVec enabled
- From: "Gael Guennebaud" <gael.guennebaud@xxxxxxxxx>
- Date: Fri, 22 Aug 2008 15:30:22 +0200
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patch committed, thanks a lot.
On Fri, Aug 22, 2008 at 12:37 PM, Konstantinos Margaritis
<markos@xxxxxxxx> wrote:
> Ok, I have an update of the AltiVec packetmath.h, seems ei_predux* methods
> were buggy, so I fixed them. Plus, ei_pdiv, ei_pmul were also problematic, I
> had to invent a new algorithm for ei_pmul (integer case) as AltiVec does not
> have an instruction for that and most algorithms on that are about unsigned
> ints (Eigen2 uses signed 32-bit ints). ei_pdiv was disabled for now, but I
> intend to look at it again closer. Right now many tests pass, except these:
>
> * cholesky (some times it fails, 3/10 failures)
> * geometry (3/10 failures)
> * inverse (1/10 failures)
> * sum (2/10 failures)
I have the same here. The failures are likely due to numerical
precision issues, and then just noise though we never checked that
carefully.
gael.