[all-commits] [llvm/llvm-project] 24ddce: [GISel] Legalize bitreverse with types smaller tha...

[Yingwei Zheng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 24ddce62c8bb92a19ba3677629c77a2e6f137b1a
      https://github.com/llvm/llvm-project/commit/24ddce62c8bb92a19ba3677629c77a2e6f137b1a
  Author: Yingwei Zheng <dtcxzyw2333 at gmail.com>
  Date:   2024-05-29 (Wed, 29 May 2024)

  Changed paths:
    M llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
    A llvm/test/CodeGen/RISCV/GlobalISel/bitmanip.ll
    M llvm/test/CodeGen/RISCV/GlobalISel/legalizer/legalize-bitreverse-rv32.mir
    M llvm/test/CodeGen/RISCV/GlobalISel/legalizer/legalize-bitreverse-rv64.mir

  Log Message:
  -----------
  [GISel] Legalize bitreverse with types smaller than 8 bits (#92998)

This patch adds support for lowering `bitreverse` with types smaller
than 8 bits. It also fixes an existing assertion failure in
`llvm::APInt::getSplat`: https://godbolt.org/z/7crs8xrcG

The lowering logic is copied from SDAG:

https://github.com/llvm/llvm-project/blob/2034f2fc8729bd4645ef7caa3c5c6efa284d2d3f/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp#L9384-L9398



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