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AMDGPU: Reduce intrinsics for single demanded vector element #141810

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Fixes #131734

  • readlane
  • update_dpp
  • permlane16
  • permlanex16
  • permlane64
  • mov_dpp8

@makslevental makslevental force-pushed the makslevental/amdgpu-reduce-readlane branch 2 times, most recently from f3c5df8 to 3e90b3b Compare May 28, 2025 17:46
@makslevental makslevental force-pushed the makslevental/amdgpu-reduce-readlane branch from 3e90b3b to d86f95f Compare May 28, 2025 17:47
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AMDGPU should handle SimplifyDemandedVectorElts for more trivial intrinsics
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