[LLVMdev] OperandWithDefaultOps question

[Joe Matarazzo]

Thanks for the reply Tom. I saw the InOperandList references to this
op class (like negate / "NEG", for example), but I could see any cases
where you referred to it in the pattern. That's why I was curious.
Hope someone can clarify.

On Fri, Feb 1, 2013 at 5:20 PM, Tom Stellard <tom at stellard.net> wrote:
> On Fri, Feb 01, 2013 at 04:58:29PM -0800, Joe Matarazzo wrote:
>> Is it possible to use this operand class in an instruction that has a
>> pattern defined? If so, can you write it with anything besides a
>> ComplexPattern in the instruction's pattern DAG, to set it to a value?
>> Can you refer to it at all? Or would it be added to the MachineInstr
>> with the default value such that you could modify it later in the
>> backend?
>>
>
> You can use OperandWithDefaultOps in an instruction with a pattern.
> Take a look at the R600 target it has a lot of instructions that use
> this operand class.
>
> It's been a while since I looked at this, but I don't think you can
> reference a member of this operand class in the pattern, but you
> should try it out to be sure.
>
> -Tom
>
>
>> If there is a non-ComplexPattern way to write this, can you provide an example?
>>
>> Thanks,
>> Joe
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