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Look through bitcast when finding IVs. (Chris' patch really.)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35347 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -235,6 +235,16 @@ DeleteTriviallyDeadInstructions(std::set<Instruction*> &Insts) {
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/// GetExpressionSCEV - Compute and return the SCEV for the specified
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/// instruction.
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SCEVHandle LoopStrengthReduce::GetExpressionSCEV(Instruction *Exp, Loop *L) {
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// Pointer to pointer bitcast instructions return the same value as their
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// operand.
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if (BitCastInst *BCI = dyn_cast<BitCastInst>(Exp)) {
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if (SE->hasSCEV(BCI) || !isa<Instruction>(BCI->getOperand(0)))
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return SE->getSCEV(BCI);
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SCEVHandle R = GetExpressionSCEV(cast<Instruction>(BCI->getOperand(0)), L);
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SE->setSCEV(BCI, R);
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return R;
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}
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// Scalar Evolutions doesn't know how to compute SCEV's for GEP instructions.
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// If this is a GEP that SE doesn't know about, compute it now and insert it.
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// If this is not a GEP, or if we have already done this computation, just let
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