[llvm] AMDGPU/GlobalISel: Lower G_EXTRACT in legalizer (PR #181036)

[Petar Avramovic via llvm-commits]

https://github.com/petar-avramovic commented:

Tests look fine now, some test cases for insert looks longer in mir but it should not matter in final result.

https://github.com/llvm/llvm-project/pull/181036