| Re: [eigen] sse transcendental functions |
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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] sse transcendental functions
- From: Rohit Garg <rpg.314@xxxxxxxxx>
- Date: Thu, 26 Mar 2009 18:41:39 +0530
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I was looking through the svn log and i found this
r944892 | ggael | 2009-03-26 18:20:24 +0530 (Thu, 26 Mar 2009) | 6 lines
* enable vectorization of sin, cos, etc. by default with an option to
disable them (-DEIGEN_FAST_MATH=0)
* add a specialization of MatrixBase::operator*(RealScalar) for fast
"matrix of complex" times scalar products (even more useful for
autodiff scalar types)
1) It could be obvious but what does the DEIGEN_FAST_MATH macro do?
2) do you feel there is place for fast implementations of such
transcendental functions in eigen? I think we should clearly advertise
in the documentation that the SSE version is for 'fast-operations' as
seems to be the case. BTW, automagically enabling these when the user
compiles with -ffast-math would be cool.
3) any particular reason why the sincos4f from the Julian's sources
hasn't made it in yet?
--
Rohit Garg
http://rpg-314.blogspot.com/
Senior Undergraduate
Department of Physics
Indian Institute of Technology
Bombay