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Re: Add optabs for common types of permutation

On Thu, Nov 23, 2017 at 02:43:32PM +0100, Michael Matz wrote:
> > If it's a VEC_PERM_EXPR then it'll be a new form of VEC_PERM_EXPR.
> 
> No, it'd be a VEC_PERM_EXPR where the magic mask is generated by a new 
> EXPR type, instead of being a mere constant.

Or an internal function that would produce the permutation mask vector
given kind and number of vector elements and element type for the mask.

	Jakub
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