[all-commits] [llvm/llvm-project] 8b173c: [AMDGPU] Reset VGPR MSBs at the end of fallthrough...

[Stanislav Mekhanoshin via All-commits]

  Branch: refs/heads/users/rampitec/10-23-_amdgpu_reset_vgpr_msbs_at_the_end_of_fallthrough_basic_block
  Home:   https://github.com/llvm/llvm-project
  Commit: 8b173c341115f3fcf0eb9e7da64fd0c8d6e52d62
      https://github.com/llvm/llvm-project/commit/8b173c341115f3fcf0eb9e7da64fd0c8d6e52d62
  Author: Stanislav Mekhanoshin <Stanislav.Mekhanoshin at amd.com>
  Date:   2025-10-23 (Thu, 23 Oct 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPULowerVGPREncoding.cpp
    M llvm/test/CodeGen/AMDGPU/vgpr-lowering-gfx1250.mir

  Log Message:
  -----------
  [AMDGPU] Reset VGPR MSBs at the end of fallthrough basic block

By convention a basic block shall start with MSBs zero. We also
need to know a previous mode in all cases as SWDEV-562450 asks
to record the old mode in the high bits of the mode.



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