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"Ghostify" embedded sentinels. This is a real win in all cases

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because less bytes are allocated and subobject construction is gone.
For reference how it works, see BasicBlock.h.
Btw. it is very assuring to see that somebody has invented
this ilist-embedded sentinel technique before me :-)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66026 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Gabor Greif
2009-03-04 06:57:48 +00:00
parent ae3f2b6c77
commit c7f6b8c5d4
3 changed files with 10 additions and 9 deletions
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6
include/llvm/CodeGen/MachineFunction.h
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@ -37,9 +37,11 @@ class TargetMachine;
template <>
struct ilist_traits<MachineBasicBlock>
: public ilist_default_traits<MachineBasicBlock> {
mutable MachineBasicBlock Sentinel;
mutable ilist_node<MachineBasicBlock> Sentinel;
public:
MachineBasicBlock *createSentinel() const { return &Sentinel; }
MachineBasicBlock *createSentinel() const {
return static_cast<MachineBasicBlock*>(&Sentinel);
}
void destroySentinel(MachineBasicBlock *) const {}
void addNodeToList(MachineBasicBlock* MBB);