Hal Finkel 8ef7b17dfc Add @llvm.assume, lowering, and some basic properties ... This is the first commit in a series that add an @llvm.assume intrinsic which can be used to provide the optimizer with a condition it may assume to be true (when the control flow would hit the intrinsic call). Some basic properties are added here: - llvm.invariant(true) is dead. - llvm.invariant(false) is unreachable (this directly corresponds to the documented behavior of MSVC's __assume(0)), so is llvm.invariant(undef). The intrinsic is tagged as writing arbitrarily, in order to maintain control dependencies. BasicAA has been updated, however, to return NoModRef for any particular location-based query so that we don't unnecessarily block code motion. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213973 91177308-0d34-0410-b5e6-96231b3b80d8		2014-07-25 21:13:35 +00:00
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llvm	Add @llvm.assume, lowering, and some basic properties	2014-07-25 21:13:35 +00:00
llvm-c	Add scoped-noalias metadata	2014-07-24 14:25:39 +00:00