[all-commits] [llvm/llvm-project] 3fb08d: [SDAG] Address post commit review feedback from f8...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3fb08d14a63f5f745d3fec2b5f6ffef4cf0a398c
      https://github.com/llvm/llvm-project/commit/3fb08d14a63f5f745d3fec2b5f6ffef4cf0a398c
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2022-11-18 (Fri, 18 Nov 2022)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

  Log Message:
  -----------
  [SDAG] Address post commit review feedback from f8c63a7f

The major change is falling through to ComputeKnownBits when we don't have an implementation of ComputeNumSignBits due to conservatism over scalable vectors.  Right now, we're mostly conservative in the same cases, but this allows our results to improve when we change ComputeKnownBits without also needing to improve ComputeNumSignBits at the same time.