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Reintroduce a check accidentally removed in 288873 to fix clang bots

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I believe this is the cause of the failure, but have not been able to confirm.  Note that this is a speculative fix; I'm still waiting for a full build to finish as I synced and ended up doing a clean build which takes 20+ minutes on my machine.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288886 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Philip Reames 2016-12-07 04:48:50 +00:00
parent 315dd3228b
commit 59d0d38b8d
1 changed files with 12 additions and 4 deletions
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16
lib/Analysis/LazyValueInfo.cpp
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@ -71,12 +71,14 @@ class LVILatticeVal {
/// "nothing known yet". /// "nothing known yet".
undefined, undefined,
/// This Value has a specific constant value. (For integers, constantrange /// This Value has a specific constant value. (For constant integers,
/// is used instead.) /// constantrange is used instead. Integer typed constantexprs can appear
/// as constant.)
constant, constant,
/// This Value is known to not have the specified value. (For integers, /// This Value is known to not have the specified value. (For constant
/// constantrange is used instead.) /// integers, constantrange is used instead. As above, integer typed
/// constantexprs can appear here.)
notconstant, notconstant,
/// The Value falls within this range. (Used only for integer typed values.) /// The Value falls within this range. (Used only for integer typed values.)
@ -232,6 +234,12 @@ public:
} }
assert(isConstantRange() && "New LVILattice type?"); assert(isConstantRange() && "New LVILattice type?");
if (!RHS.isConstantRange()) {
// We can get here if we've encountered a constantexpr of integer type
// and merge it with a constantrange.
markOverdefined();
return;
}
ConstantRange NewR = Range.unionWith(RHS.getConstantRange()); ConstantRange NewR = Range.unionWith(RHS.getConstantRange());
if (NewR.isFullSet()) if (NewR.isFullSet())
markOverdefined(); markOverdefined();