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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 :-)

llvm-svn: 66026
This commit is contained in:
Gabor Greif 2009-03-04 06:57:48 +00:00
parent 7d9019d0f3
commit f8d2f7429d
3 changed files with 10 additions and 9 deletions
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6
include/llvm/CodeGen/MachineBasicBlock.h
View File

@ -26,14 +26,16 @@ class MachineFunction;
template <>
struct ilist_traits<MachineInstr> : public ilist_default_traits<MachineInstr> {
private:
mutable MachineInstr Sentinel;
mutable ilist_node<MachineInstr> Sentinel;
// this is only set by the MachineBasicBlock owning the LiveList
friend class MachineBasicBlock;
MachineBasicBlock* Parent;
public:
MachineInstr *createSentinel() const { return &Sentinel; }
MachineInstr *createSentinel() const {
return static_cast<MachineInstr*>(&Sentinel);
}
void destroySentinel(MachineInstr *) const {}
void addNodeToList(MachineInstr* N);

6
include/llvm/CodeGen/MachineFunction.h
View File

@ -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);

7
include/llvm/CodeGen/SelectionDAG.h
View File

@ -39,13 +39,10 @@ class FunctionLoweringInfo;
template<> struct ilist_traits<SDNode> : public ilist_default_traits<SDNode> {
private:
mutable SDNode Sentinel;
mutable ilist_node<SDNode> Sentinel;
public:
ilist_traits() : Sentinel(ISD::DELETED_NODE, DebugLoc::getUnknownLoc(),
SDVTList()) {}
SDNode *createSentinel() const {
return &Sentinel;
return static_cast<SDNode*>(&Sentinel);
}
static void destroySentinel(SDNode *) {}