[PATCH] D56387: [DAGCombiner] Enable SimplifyDemandedBits vector support for TRUNCATE

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

The pattern in question comes out of https://github.com/llvm/llvm-project/blob/0fa0cf8638b0777a1a44feebf78a63865e48ecf6/llvm/lib/Target/ARM/ARMInstrNEON.td#L3100 , and it traces out to https://github.com/llvm/llvm-project/blob/0fa0cf8638b0777a1a44feebf78a63865e48ecf6/llvm/lib/Target/ARM/ARMInstrNEON.td#L4216 .

Probably we want to do what the Hexagon backend does: `def asext: PatFrags<(ops node:$Rs), [(sext node:$Rs), (anyext node:$Rs)]>;`.


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