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Make LSR ignore GEP's that have loop variant base values, as we currently cannot codegen them git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22576 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -251,6 +251,9 @@ void LoopStrengthReduce::AnalyzeGetElementPtrUsers(GetElementPtrInst *GEP,
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UIntPtrTy));
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} else {
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SCEVHandle Idx = SE->getSCEV(GEP->getOperand(i));
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// If this operand is reducible, and it's not the one we are looking at
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// currently, do not process the GEP at this time.
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if (CanReduceSCEV(Idx, L))
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return;
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Base = SCEVAddExpr::get(Base, GetAdjustedIndex(Idx,
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@ -287,6 +290,13 @@ void LoopStrengthReduce::AnalyzeGetElementPtrUsers(GetElementPtrInst *GEP,
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assert(CanReduceSCEV(GEPIndexExpr, L) && "Non reducible idx??");
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// FIXME: If the base is not loop invariant, we currently cannot emit this.
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if (!Base->isLoopInvariant(L)) {
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DEBUG(std::cerr << "IGNORING GEP due to non-invaiant base: "
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<< *Base << "\n");
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return;
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}
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Base = SCEVAddExpr::get(Base, cast<SCEVAddRecExpr>(GEPIndexExpr)->getStart());
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SCEVHandle Stride = cast<SCEVAddRecExpr>(GEPIndexExpr)->getOperand(1);
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