[llvm-commits] [llvm] r72325 - in /llvm/trunk: include/llvm/CodeGen/SelectionDAG.h lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp

[Chris Lattner]

On May 26, 2009, at 11:16 AM, Dan Gohman wrote:

>
> On May 25, 2009, at 4:12 PM, Chris Lattner wrote:
>
>>>
>>>
>>> +// This file implements the SelectionDAG::LegalizeVectors method.
>>>
>>> +//
>>>
>>> +// The vector legalizer looks for vector operations which might
>>>
>>> need to be
>>>
>>> +// unrolled and legalizes them.
>>>
>>
>> s/unroll/scalarize/g?  This should never do any "splitting" of
>> vectors, right?
>
> No; unrolling is different than scalarizing, in Legalize jargon.
> Scalarizing is turning a single-element vector with an illegal
> type into a scalar. Unrolling is turning a (potentially)
> multiple-element vector with a legal type into a flock of scalars
> in order to perform an operation on them which is not legal on
> the vector type.

How about flocking or flattening?

-Chris