20 Dec
2012
20 Dec
'12
4:35 p.m.
* is it possible to define simd kernels for both packs and scalars e.g. to make use of branches in the scalar implementation used in preroll/postroll of unrolled loops?
All operations on pack are also defined on scalar so if you write a polymorphic template functor, it will work on both. There is a simple example of this in the paper.
While this works, if you do this you won't be able to use lazy branch evaluation in the scalar version.
If you write
c = if_else(a != 0, b/a, b);
this is equivalent in scalar to
c = (a != 0) ? b/a : b;
except that in the case above you will always compute the division.
would it be possible to simply provide an overloaded operator() for scalar types? cheers, tim