[all-commits] [llvm/llvm-project] 896d90: [AMDGPU] Create hi-half of 64-bit ashr with mov of...

[LU-JOHN via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 896d900c9b71f8b11bcacc8ead56f15c8a16155b
      https://github.com/llvm/llvm-project/commit/896d900c9b71f8b11bcacc8ead56f15c8a16155b
  Author: LU-JOHN <John.Lu at amd.com>
  Date:   2025-07-09 (Wed, 09 Jul 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
    A llvm/test/CodeGen/AMDGPU/ashr64_reduce_flags.ll
    A llvm/test/CodeGen/AMDGPU/neg_ashr64_reduce.ll

  Log Message:
  -----------
  [AMDGPU] Create hi-half of 64-bit ashr with mov of -1 (#146569)

When performing a 64-bit sra of a negative value with a shift range from
[32-63], create the hi-half with a move of -1.

Alive verification: https://alive2.llvm.org/ce/z/kXd7Ac

Also, preserve exact flag. Alive verification:
https://alive2.llvm.org/ce/z/L86tXf.

---------

Signed-off-by: John Lu <John.Lu at amd.com>



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