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Rename UnknownValue to CouldNotCompute, since it holds an instance of

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SCEVCouldNotCompute, and not SCEVUnknown.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72999 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-06-06 14:37:11 +00:00
parent 5257106c4d
commit 86fbf2fe4c
2 changed files with 44 additions and 44 deletions
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14
include/llvm/Analysis/ScalarEvolution.h
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@@ -227,9 +227,9 @@ namespace llvm {
///
TargetData *TD;
/// UnknownValue - This SCEV is used to represent unknown trip counts and
/// things.
SCEVHandle UnknownValue;
/// CouldNotCompute - This SCEV is used to represent unknown trip
/// counts and things.
SCEVHandle CouldNotCompute;
/// Scalars - This is a cache of the scalars we have analyzed so far.
///
@@ -322,23 +322,23 @@ namespace llvm {
/// a constant number of times (the condition evolves only from constants),
/// try to evaluate a few iterations of the loop until we get the exit
/// condition gets a value of ExitWhen (true or false). If we cannot
/// evaluate the trip count of the loop, return UnknownValue.
/// evaluate the trip count of the loop, return CouldNotCompute.
SCEVHandle ComputeBackedgeTakenCountExhaustively(const Loop *L, Value *Cond,
bool ExitWhen);
/// HowFarToZero - Return the number of times a backedge comparing the
/// specified value to zero will execute. If not computable, return
/// UnknownValue.
/// CouldNotCompute.
SCEVHandle HowFarToZero(const SCEV *V, const Loop *L);
/// HowFarToNonZero - Return the number of times a backedge checking the
/// specified value for nonzero will execute. If not computable, return
/// UnknownValue.
/// CouldNotCompute.
SCEVHandle HowFarToNonZero(const SCEV *V, const Loop *L);
/// HowManyLessThans - Return the number of times a backedge containing the
/// specified less-than comparison will execute. If not computable, return
/// UnknownValue. isSigned specifies whether the less-than is signed.
/// CouldNotCompute. isSigned specifies whether the less-than is signed.
BackedgeTakenInfo HowManyLessThans(const SCEV *LHS, const SCEV *RHS,
const Loop *L, bool isSigned);