Sanjay Patel e5a32d720e [InstCombine] move extend after insertelement if both operands are extended ...

I was wondering how instcombine does on the examples in D109236,
and we're missing a basic transform:

inselt (ext X), (ext Y), Index --> ext (inselt X, Y, Index)

https://alive2.llvm.org/ce/z/z2aBu9

Note that there are several possible extensions of this fold
(see TODO comments).

Differential Revision: https://reviews.llvm.org/D109537

2021-09-15 14:38:03 -04:00

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