[llvm] r211694 - [x86] Add intrinsics for the pshufd, pshuflw, and pshufhw instructions.

[Chandler Carruth]

On Wed, Jun 25, 2014 at 6:01 PM, Hal Finkel <hfinkel at anl.gov> wrote:

> I don't understand this; what do you mean? Exactly what are you testing?
>

See my patch to add target-specific DAG combines of the PSHUF instruction
nodes. I'd like to set up specific (trivial) pattterns of shuffles that I
expect to potentially come out of the lowering algorithm and check that
they fold away. If I test this with a generic shuffle, the target
independent dag combiner will catch everything long before the
target-specific one runs.
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