Sanjay Patel 75892a1543 [SimplifyCFG] eliminate switch cases based on known range of switch condition ...

This was noted in PR24766:
https://llvm.org/bugs/show_bug.cgi?id=24766#c2

We may not know whether the sign bit(s) are zero or one, but we can still
optimize based on knowing that the sign bit is repeated.

Differential Revision: http://reviews.llvm.org/D20275

llvm-svn: 270222

2016-05-20 14:53:09 +00:00

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