diff options
Diffstat (limited to 'lib/Transforms/Scalar/LoopStrengthReduce.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/LoopStrengthReduce.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp index a52b7d0f1c..d18a008fef 100644 --- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp +++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp @@ -1439,6 +1439,7 @@ SCEVHandle LoopStrengthReduce::CollectIVUsers(const SCEVHandle &Stride, // fields of the BasedUsers. We do this so that it increases the commonality // of the remaining uses. unsigned NumPHI = 0; + bool HasAddress = false; for (unsigned i = 0, e = UsersToProcess.size(); i != e; ++i) { // If the user is not in the current loop, this means it is using the exit // value of the IV. Do not put anything in the base, make sure it's all in @@ -1449,7 +1450,6 @@ SCEVHandle LoopStrengthReduce::CollectIVUsers(const SCEVHandle &Stride, UsersToProcess[i].Base = SE->getIntegerSCEV(0, UsersToProcess[i].Base->getType()); } else { - // Addressing modes can be folded into loads and stores. Be careful that // the store is through the expression, not of the expression though. bool isPHI = false; @@ -1462,6 +1462,9 @@ SCEVHandle LoopStrengthReduce::CollectIVUsers(const SCEVHandle &Stride, // Not all uses are outside the loop. AllUsesAreOutsideLoop = false; + + if (isAddress) + HasAddress = true; // If this use isn't an address, then not all uses are addresses. if (!isAddress && !isPHI) @@ -1478,6 +1481,10 @@ SCEVHandle LoopStrengthReduce::CollectIVUsers(const SCEVHandle &Stride, if (NumPHI > 1) AllUsesAreAddresses = false; + // There are no in-loop address uses. + if (AllUsesAreAddresses && (!HasAddress && !AllUsesAreOutsideLoop)) + AllUsesAreAddresses = false; + return CommonExprs; } |