[PATCH] D108355: [AggressiveInstCombine] Add arithmetic shift right instr to `TruncInstCombine` DAG

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri requested changes to this revision.
lebedev.ri added a comment.
This revision now requires changes to proceed.

I'm pretty sure we should count the number of sign bits here, much like how we count the number of leading zeros:
https://godbolt.org/z/vGsf664Gf => https://alive2.llvm.org/ce/z/gIc43E


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D108355/new/

https://reviews.llvm.org/D108355