[PATCH] D116058: [InstCombine] Convert binop(phi, v) to phi(binop) for constant phi operands

[Guozhi Wei via Phabricator via llvm-commits]

Carrot added a comment.

In D116058#3204290 <https://reviews.llvm.org/D116058#3204290>, @lebedev.ri wrote:

>> immediate materialization instructions
>
> There is no such thing in IR, so this sounds like it should be a back-end backtransform?

Although it is not explicitly expressed in LLVM IR, it must be setup in predecessors later.
Back end transformation should also be doable, but is it worth a new back end pass?


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