[all-commits] [llvm/llvm-project] 46c948: [GlobalISel] Add `G_EXTRACT_VECTOR_ELT` for `compu...

[Moritz Zielke via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 46c948935dd94c8caa0e8e850a8ec95dff784bd2
      https://github.com/llvm/llvm-project/commit/46c948935dd94c8caa0e8e850a8ec95dff784bd2
  Author: Moritz Zielke <moritz.zielke at gmail.com>
  Date:   2025-11-05 (Wed, 05 Nov 2025)

  Changed paths:
    M llvm/lib/CodeGen/GlobalISel/GISelValueTracking.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/knownbits-buildvector.mir
    A llvm/test/CodeGen/AArch64/GlobalISel/knownbits-extract-vector.mir
    M llvm/test/CodeGen/AArch64/neon-extadd-extract.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/sdiv.i64.ll

  Log Message:
  -----------
  [GlobalISel] Add `G_EXTRACT_VECTOR_ELT` for `computeKnownBits` (#164825)

The code is ported from `SelectionDAG::computeKnownBits`.

As a result of adding `G_EXTRACT_VECTOR_ELT` to `GlobalISel`, the code
generated for some of the existing regression tests changes. The changes
in `neon-extadd-extract.ll` and `knownbits-buildvector.mir` look good to
me. Though I'm struggling to understand the diff in `sdiv.i64.ll`. Is
there a test that checks if the generated amdgcn produces the correct
result? Or tools that help with executing it (I do have an AMD GPU)?

**Edit**: Related to #150515



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