[LLVMdev] Extracting a splat value from vector instruction.

[Demikhovsky, Elena]

Hi,

We have a function in IRBuilder.h
Value *CreateVectorSplat(unsigned NumElts, Value *V, const Twine &Name = "") {
..
}

This function creates 2 instructions - "insertelement" and "shuffle" with all-zero mask.

Now I want to add
Value *getSplatValue(Value *Val). This function will try to recognize the pattern - insertelement+shuffle and return the splat value (or nullptr).
I suppose, this interface should be useful. Do you agree with me?

If yes, where should I put it? May it be I can define a new class VectorInst and put this interface there?
Thank you.


-        Elena



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