ISD::ZERO_EXTEND / SIGN_EXTEND of sub-vectors

[Jonas Paulsson via llvm-commits]

Hi Eli,


> Are you sure "InOp" is the right input to the operation? 
> SIGN_EXTEND_VECTOR_INREG expects that the input and the output are the 
> same size, but you aren't doing anything to ensure that.
>
>
I was expecting GetWidenedVector() which always returns a widened 
vector, to return a vector of legal width. But I guess it can't hurt to 
verify that this is the case. Please see attached updated patch.

thanks!

/Jonas
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