[LLVMdev] Help required in instruction selection.

[pratik dand]

Dear,

I have the following problem.
I am given 2 instructions say I1 and I2 whose selection should depend on
the operands.
Say the operands have a boolean attribute 'attr'. I would like to select I1
and I2 by some logic that involves the 'attr' attribute of all the operands
involved.
eg: If all operands have attr set to True, I want I1 to be selected to
operate else I2.

How can I add an attribute to the operands?
How will the values of these attributes be set?
How should to select the instructions based on the logic?

-- 
Pratik
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