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Fix a bug Brian found.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12754 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -924,6 +924,7 @@ SCEVHandle SCEVZeroExtendExpr::get(const SCEVHandle &Op, const Type *Ty) {
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// get - Get a canonical add expression, or something simpler if possible.
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SCEVHandle SCEVAddExpr::get(std::vector<SCEVHandle> &Ops) {
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assert(!Ops.empty() && "Cannot get empty add!");
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if (Ops.size() == 1) return Ops[0];
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// Sort by complexity, this groups all similar expression types together.
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std::sort(Ops.begin(), Ops.end(), SCEVComplexityCompare());
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@ -932,6 +933,7 @@ SCEVHandle SCEVAddExpr::get(std::vector<SCEVHandle> &Ops) {
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unsigned Idx = 0;
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if (SCEVConstant *LHSC = dyn_cast<SCEVConstant>(Ops[0])) {
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++Idx;
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assert(Idx < Ops.size());
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while (SCEVConstant *RHSC = dyn_cast<SCEVConstant>(Ops[Idx])) {
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// We found two constants, fold them together!
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Constant *Fold = ConstantExpr::getAdd(LHSC->getValue(), RHSC->getValue());
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@ -954,8 +956,7 @@ SCEVHandle SCEVAddExpr::get(std::vector<SCEVHandle> &Ops) {
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}
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}
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if (Ops.size() == 1)
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return Ops[0];
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if (Ops.size() == 1) return Ops[0];
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// Okay, check to see if the same value occurs in the operand list twice. If
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// so, merge them together into an multiply expression. Since we sorted the
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