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add a long-overdue AllocaInst::isStaticAlloca method.

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llvm-svn: 60080
This commit is contained in:
Chris Lattner 2008-11-26 02:54:17 +00:00
parent f069b62cd7
commit c9d864b689
2 changed files with 17 additions and 0 deletions
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5
include/llvm/Instructions.h
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@ -167,6 +167,11 @@ public:
: AllocationInst(Ty, ArraySize, Alloca, Align, NameStr, InsertAtEnd) {}
virtual AllocaInst *clone() const;
/// isStaticAlloca - Return true if this alloca is in the entry block of the
/// function and is a constant size. If so, the code generator will fold it
/// into the prolog/epilog code, so it is basically free.
bool isStaticAlloca() const;
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const AllocaInst *) { return true; }

12
lib/VMCore/Instructions.cpp
View File

@ -732,6 +732,18 @@ AllocaInst::AllocaInst(const AllocaInst &AI)
Instruction::Alloca, AI.getAlignment()) {
}
/// isStaticAlloca - Return true if this alloca is in the entry block of the
/// function and is a constant size. If so, the code generator will fold it
/// into the prolog/epilog code, so it is basically free.
bool AllocaInst::isStaticAlloca() const {
// Must be constant size.
if (!isa<ConstantInt>(getArraySize())) return false;
// Must be in the entry block.
const BasicBlock *Parent = getParent();
return Parent == &Parent->getParent()->front();
}
MallocInst::MallocInst(const MallocInst &MI)
: AllocationInst(MI.getType()->getElementType(), (Value*)MI.getOperand(0),
Instruction::Malloc, MI.getAlignment()) {