[PATCH] D16744: SelectionDAG: Lower some range metadata to AssertZext

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added a subscriber: llvm-commits.
Herald added a reviewer: tstellarAMD.

If a range has a lower bound of 0, add an AssertZext from the
nearest floor power of two.
    
This allows operations with some workitem intrinsics with known
maximum ranges to use fast 24-bit multiplies.


http://reviews.llvm.org/D16744

Files:
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
  test/CodeGen/AArch64/lower-range-metadata-func-call.ll
  test/CodeGen/AMDGPU/lower-range-metadata-intrinsic-call.ll

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