Hal Finkel 93873cc10e Check for all known bits on ret in InstCombine ...

From a combination of @llvm.assume calls (and perhaps through other means, such
as range metadata), it is possible that all bits of a return value might be
known. Previously, InstCombine did not check for this (which is understandable
given assumptions of constant propagation), but means that we'd miss simple
cases where assumptions are involved.

llvm-svn: 217346

2014-09-07 21:28:34 +00:00

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