[all-commits] [llvm/llvm-project] 2258bc: [AMDGPU] Simplify, fix and improve known bits for ...

[Jay Foad via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2258bc429b6f76ade78059f3c4f6c7c77f93a996
      https://github.com/llvm/llvm-project/commit/2258bc429b6f76ade78059f3c4f6c7c77f93a996
  Author: Jay Foad <jay.foad at amd.com>
  Date:   2024-08-19 (Mon, 19 Aug 2024)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIISelLowering.cpp
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.mbcnt.ll

  Log Message:
  -----------
  [AMDGPU] Simplify, fix and improve known bits for mbcnt (#104768)

Simplify by using KnownBits::add.

Fix GlobalISel path which was ignoring the known bits of src1.

Improve analysis of mbcnt.hi which adds at most 31 even in wave64.



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