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Shrink the size of AllocationInst by using its SubclassData

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field to store the alignment value instead of haing a
separate field.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48727 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2008-03-24 16:55:58 +00:00
parent 4c931fc6e2
commit 52837078c7
2 changed files with 13 additions and 10 deletions
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14
lib/VMCore/Instructions.cpp
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@@ -677,8 +677,8 @@ AllocationInst::AllocationInst(const Type *Ty, Value *ArraySize, unsigned iTy,
unsigned Align, const std::string &Name,
Instruction *InsertBefore)
: UnaryInstruction(PointerType::getUnqual(Ty), iTy, getAISize(ArraySize),
InsertBefore), Alignment(Align) {
assert((Align & (Align-1)) == 0 && "Alignment is not a power of 2!");
InsertBefore) {
setAlignment(Align);
assert(Ty != Type::VoidTy && "Cannot allocate void!");
setName(Name);
}
@@ -687,8 +687,8 @@ AllocationInst::AllocationInst(const Type *Ty, Value *ArraySize, unsigned iTy,
unsigned Align, const std::string &Name,
BasicBlock *InsertAtEnd)
: UnaryInstruction(PointerType::getUnqual(Ty), iTy, getAISize(ArraySize),
InsertAtEnd), Alignment(Align) {
assert((Align & (Align-1)) == 0 && "Alignment is not a power of 2!");
InsertAtEnd) {
setAlignment(Align);
assert(Ty != Type::VoidTy && "Cannot allocate void!");
setName(Name);
}
@@ -697,6 +697,12 @@ AllocationInst::AllocationInst(const Type *Ty, Value *ArraySize, unsigned iTy,
AllocationInst::~AllocationInst() {
}
void AllocationInst::setAlignment(unsigned Align) {
assert((Align & (Align-1)) == 0 && "Alignment is not a power of 2!");
SubclassData = Log2_32(Align) + 1;
assert(getAlignment() == Align && "Alignment representation error!");
}
bool AllocationInst::isArrayAllocation() const {
if (ConstantInt *CI = dyn_cast<ConstantInt>(getOperand(0)))
return CI->getZExtValue() != 1;