| Re: [eigen] Calls to copyPacketByOuterInner: when do they happen? |
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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] Calls to copyPacketByOuterInner: when do they happen?
- From: Sébastien Barthélémy <barthelemy@xxxxxxxxx>
- Date: Mon, 25 Nov 2013 23:10:00 +0100
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Le 25 nov. 2013 22:50, "Martin Felis" <martin.felis@xxxxxxxxxxxxxxxxxxxxx> a écrit :
> Could it be that uninitialized values have a negative impact on Eigen's
> performance?
Yes, I had the same problem once. It turned out that uninitialized values produce much more denormalized numbers than initialized ones.
You can confirm it using the FTZ and DAZ modes of the processor.
Cheers