diff options
Diffstat (limited to 'llvm/lib/Transforms/Scalar')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp index 4ace17f7a4a..f48f828cb6f 100644 --- a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp +++ b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp @@ -235,6 +235,16 @@ DeleteTriviallyDeadInstructions(std::set<Instruction*> &Insts) { /// GetExpressionSCEV - Compute and return the SCEV for the specified /// instruction. SCEVHandle LoopStrengthReduce::GetExpressionSCEV(Instruction *Exp, Loop *L) { + // Pointer to pointer bitcast instructions return the same value as their + // operand. + if (BitCastInst *BCI = dyn_cast<BitCastInst>(Exp)) { + if (SE->hasSCEV(BCI) || !isa<Instruction>(BCI->getOperand(0))) + return SE->getSCEV(BCI); + SCEVHandle R = GetExpressionSCEV(cast<Instruction>(BCI->getOperand(0)), L); + SE->setSCEV(BCI, R); + return R; + } + // Scalar Evolutions doesn't know how to compute SCEV's for GEP instructions. // If this is a GEP that SE doesn't know about, compute it now and insert it. // If this is not a GEP, or if we have already done this computation, just let |
