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Instead of testing whether an instruction dominates the loop preheader,
test whether it properly dominates the loop header. This is equivalent when the loop has a preheader, and has the advantage of working when the loop doesn't have a preheader. Since IVUsers doesn't Require LoopSimplify, the loop isn't guaranteed to have a preheader. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82899 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -121,11 +121,11 @@ static bool getSCEVStartAndStride(const SCEV *&SH, Loop *L, Loop *UseLoop,
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Start = SE->getAddExpr(Start, AddRecStart);
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// If stride is an instruction, make sure it dominates the loop preheader.
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// If stride is an instruction, make sure it properly dominates the header.
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// Otherwise we could end up with a use before def situation.
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if (!isa<SCEVConstant>(AddRecStride)) {
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BasicBlock *Preheader = L->getLoopPreheader();
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if (!AddRecStride->dominates(Preheader, DT))
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BasicBlock *Header = L->getHeader();
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if (!AddRecStride->properlyDominates(Header, DT))
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return false;
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DEBUG(errs() << "[" << L->getHeader()->getName()
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