[all-commits] [llvm/llvm-project] 66c069: [InstCombine] add tests for shift-trunc-shift; NFC

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  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 66c069d7d626259d354c6fdac6b7d309b7963ed2
      https://github.com/llvm/llvm-project/commit/66c069d7d626259d354c6fdac6b7d309b7963ed2
  Author: Sanjay Patel <spatel at rotateright.com>
  Date:   2021-09-30 (Thu, 30 Sep 2021)

  Changed paths:
    M llvm/test/Transforms/InstCombine/shift-shift.ll

  Log Message:
  -----------
  [InstCombine] add tests for shift-trunc-shift; NFC


  Commit: 3fcb00df5dbfa63844db148bd6877d865a930400
      https://github.com/llvm/llvm-project/commit/3fcb00df5dbfa63844db148bd6877d865a930400
  Author: Sanjay Patel <spatel at rotateright.com>
  Date:   2021-09-30 (Thu, 30 Sep 2021)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineShifts.cpp

  Log Message:
  -----------
  [InstCombine] restrict shift-trunc-shift fold to opposite direction shifts

This is NFCI because the pattern with 2 left-shifts should get
folded independently by smaller folds.

The motivation is to refine this block to avoid infinite loops
seen with D110170.


Compare: https://github.com/llvm/llvm-project/compare/e31899c7080f...3fcb00df5dbf