Vector shuffling

[Richard Guenther]

On Sun, Aug 15, 2010 at 6:07 PM, Chris Lattner <clattner@apple.com> wrote:
>
> On Aug 15, 2010, at 7:30 AM, Artem Shinkarov wrote:
>
>> The patch implements vector shuffling according to the OpenCL
>> standard. The patch introduces builtin function __builtin_shuffle
>> which accepts two or three parameters: __builtin_shuffle (vec, mask)
>> or __builtin_shuffle (vec0, vec1, mask) and returns a shuffled vector.
>>
>> Function is trying to dispatch shuffling to the hardware-specific
>> shuffling instructions via new target hooks. If this attempt fails,
>> function expands shuffling piecewise.
>
> Great, thanks for working on this.  In the effort to make free software compilers agree with each other in this case, could you consider implementing the same extension that Clang provides?
> http://clang.llvm.org/docs/LanguageExtensions.html#__builtin_shufflevector
>
> The major difference is the naming of the builtin and that the index list is taken as a series of variadic arguments.

I don't see how you can implement OpenCL shuffle and shuffle2 with that.

Richard.

> -Chris