[all-commits] [llvm/llvm-project] bdf8e3: AMDGPU: Don't avoid clamp of bit shift in BFE patt...

[Changpeng Fang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bdf8e308b7ea430f619ca3aa1199a76eb6b4e2d4
      https://github.com/llvm/llvm-project/commit/bdf8e308b7ea430f619ca3aa1199a76eb6b4e2d4
  Author: Changpeng Fang <changpeng.fang at amd.com>
  Date:   2024-11-07 (Thu, 07 Nov 2024)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h
    M llvm/lib/Target/AMDGPU/SIInstructions.td
    M llvm/test/CodeGen/AMDGPU/bfe-patterns.ll
    M llvm/test/CodeGen/AMDGPU/extract-lowbits.ll

  Log Message:
  -----------
  AMDGPU: Don't avoid clamp of bit shift in BFE pattern (#115372)

Enable pattern matching from "x<<32-y>>32-y" to "bfe x, 0, y" when we
know y is in [0,31].
This is the follow-up for the PR:
https://github.com/llvm/llvm-project/pull/114279 to fix the issue:
https://github.com/llvm/llvm-project/issues/114282



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