[all-commits] [llvm/llvm-project] 734112: [GlobalISel][KnownBits] Early return on out of bou...

[Konstantin Schwarz via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 734112343917a011676c2915c5e5d29803a51ba6
      https://github.com/llvm/llvm-project/commit/734112343917a011676c2915c5e5d29803a51ba6
  Author: Konstantin Schwarz <konstantin.schwarz at hightec-rt.com>
  Date:   2020-10-12 (Mon, 12 Oct 2020)

  Changed paths:
    M llvm/lib/CodeGen/GlobalISel/GISelKnownBits.cpp
    M llvm/unittests/CodeGen/GlobalISel/KnownBitsTest.cpp

  Log Message:
  -----------
  [GlobalISel][KnownBits] Early return on out of bound shift amounts

If the known shift amount is bigger than or equal to the bitwidth of the type of the value to be shifted,
the result is target dependent, so don't try to infer any bits.

This fixes a crash we've seen in one of our internal test suites.

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D89232