clattner at apple.com
Tue Dec 1 13:04:31 PST 2009
On Dec 1, 2009, at 11:43 AM, David Greene wrote:
> On Tuesday 01 December 2009 12:14, Dan Gohman wrote:
>> On Dec 1, 2009, at 9:03 AM, David Greene wrote:
>>> On Tuesday 01 December 2009 11:01, Chris Lattner wrote:
>>>> What are you trying to accomplish? What would use this?
>>> I am trying to determine whether a MachineMemOperand is a vector
>> Again, what's that for? If you're interested in which pipeline a load
>> feeds, ye olde Vector vs. Scalar isn't sufficient (on x86, for
>> If you're interested in the size and/or alignment, that information
>> already there.
> Right, but vector/scalar is useful for tracking how much code is
> vectorized. That can come in handy when doing performance analysis.
> Right now it's just for comments but I can imagine other uses, such
> as peeps and the like.
> The size is actually calculated from an EVT nearly everywhere (and
> where it's not it should be easy to add). We could just replace the
> size with the EVT and have more information.
It sounds like you're looking for a property of an instruction, not an
operand. If you're looking for vector instructions, that should be
captured in TargetInstrInfo, not in MachineInstrs/Operands.
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