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Teach SCEV::isLoopInvariant and SCEV::hasComputableLoopEvolution
about the convention from LoopInfo that a null Loop* means the entire function body. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72152 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -388,7 +388,9 @@ replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
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bool SCEVAddRecExpr::isLoopInvariant(const Loop *QueryLoop) const {
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// This recurrence is invariant w.r.t to QueryLoop iff QueryLoop doesn't
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// contain L and if the start is invariant.
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return !QueryLoop->contains(L->getHeader()) &&
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// Add recurrences are never invariant in the function-body (null loop).
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return QueryLoop &&
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!QueryLoop->contains(L->getHeader()) &&
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getOperand(0)->isLoopInvariant(QueryLoop);
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}
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@ -410,8 +412,10 @@ SCEVUnknown::~SCEVUnknown() { SCEVUnknowns->erase(V); }
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bool SCEVUnknown::isLoopInvariant(const Loop *L) const {
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// All non-instruction values are loop invariant. All instructions are loop
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// invariant if they are not contained in the specified loop.
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// Instructions are never considered invariant in the function body
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// (null loop) because they are defined within the "loop".
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if (Instruction *I = dyn_cast<Instruction>(V))
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return !L->contains(I->getParent());
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return L && !L->contains(I->getParent());
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return true;
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}
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