[llvm-bugs] [Bug 20992] unexpected behavior using result of __lzcnt64() on x86_64

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=20992

Simon Pilgrim <llvm-dev at redking.me.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
          Component|-New Bugs                   |Headers
         Resolution|---                         |FIXED
                 CC|                            |llvm-dev at redking.me.uk

--- Comment #1 from Simon Pilgrim <llvm-dev at redking.me.uk> ---
Craig Topper fixed the headers for __lzcnt* (rL221064) and __tzcnt* (rL221065)
to avoid this issue. Later improvements in the combiners improved codegen to
avoid the compare+branch.

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