[PATCH] D12249: Remove the final bit test during lowering switch statement if all cases in bit test cover a contiguous range.

[Cong Hou via llvm-commits]

congh updated this revision to Diff 32887.
congh added a comment.

Update the patch by disabling the optimization in this patch when the case value can fit in a word and the minimum value of the value range is not zero (in which case we can save a subtraction).


http://reviews.llvm.org/D12249

Files:
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
  lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
  test/CodeGen/X86/switch.ll

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