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Re: Vector shuffling

On 08/15/2010 08:54 PM, Steven Bosscher wrote:
On Sun, Aug 15, 2010 at 6:07 PM, Chris Lattner<>

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?

The major difference is the naming of the builtin and that the
index  list is taken as a series of variadic arguments.

It seems to me that the focus should first be on implementing the standard, and only look at extensions later. But perhaps you can file an enhancement request in Bugzilla when the patch is on the GCC trunk.

In fact, it would be even better if the three-argument variable was named shuffle2, which is coherent with OpenCL C.


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