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add a long-overdue AllocaInst::isStaticAlloca method.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60080 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -167,6 +167,11 @@ public:
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: AllocationInst(Ty, ArraySize, Alloca, Align, NameStr, InsertAtEnd) {}
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virtual AllocaInst *clone() const;
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/// isStaticAlloca - Return true if this alloca is in the entry block of the
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/// function and is a constant size. If so, the code generator will fold it
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/// into the prolog/epilog code, so it is basically free.
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bool isStaticAlloca() const;
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const AllocaInst *) { return true; }
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@ -732,6 +732,18 @@ AllocaInst::AllocaInst(const AllocaInst &AI)
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Instruction::Alloca, AI.getAlignment()) {
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}
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/// isStaticAlloca - Return true if this alloca is in the entry block of the
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/// function and is a constant size. If so, the code generator will fold it
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/// into the prolog/epilog code, so it is basically free.
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bool AllocaInst::isStaticAlloca() const {
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// Must be constant size.
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if (!isa<ConstantInt>(getArraySize())) return false;
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// Must be in the entry block.
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const BasicBlock *Parent = getParent();
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return Parent == &Parent->getParent()->front();
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}
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MallocInst::MallocInst(const MallocInst &MI)
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: AllocationInst(MI.getType()->getElementType(), (Value*)MI.getOperand(0),
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Instruction::Malloc, MI.getAlignment()) {
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