David Majnemer a315bd80c2 InstSimplify: Simplify trivial and/or of icmps ...

Some ICmpInsts when anded/ored with another ICmpInst trivially reduces
to true or false depending on whether or not all integers or no integers
satisfy the intersected/unioned range.

This sort of trivial looking code can come about when InstCombine
performs a range reduction-type operation on sdiv and the like.

This fixes PR20916.

llvm-svn: 217750

2014-09-15 08:15:28 +00:00

137 KiB

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