[PATCH] D68131: Switch lowering: omit range check for bit tests when default is unreachable (PR43129)

[Hans Wennborg via Phabricator via llvm-commits]

hans created this revision.
hans added reviewers: spatel, nickdesaulniers.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.

This is modeled after the same functionality for jump tables, which was added in r357067.


https://reviews.llvm.org/D68131

Files:
  llvm/include/llvm/CodeGen/SwitchLoweringUtils.h
  llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  llvm/test/CodeGen/X86/switch-bt.ll

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