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Move some calls to getVRegDef higher in the callgraph, so they don't get executed as frequently in performance sensitive code. 

llvm-svn: 46027
This commit is contained in:
Owen Anderson 2008-01-15 22:58:11 +00:00
parent cc7ff8c1dd
commit 897aed9109
2 changed files with 15 additions and 13 deletions
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6
llvm/include/llvm/CodeGen/LiveVariables.h
View File

@ -303,8 +303,10 @@ public:
/// register.
VarInfo &getVarInfo(unsigned RegIdx);
void MarkVirtRegAliveInBlock(unsigned reg, MachineBasicBlock *BB);
void MarkVirtRegAliveInBlock(unsigned reg, MachineBasicBlock *BB,
void MarkVirtRegAliveInBlock(VarInfo& VRInfo, MachineBasicBlock* DefBlock,
MachineBasicBlock *BB);
void MarkVirtRegAliveInBlock(VarInfo& VRInfo, MachineBasicBlock* DefBlock,
MachineBasicBlock *BB,
std::vector<MachineBasicBlock*> &WorkList);
void HandleVirtRegUse(unsigned reg, MachineBasicBlock *MBB,
MachineInstr *MI);

22
llvm/lib/CodeGen/LiveVariables.cpp
View File

@ -112,12 +112,11 @@ bool LiveVariables::ModifiesRegister(MachineInstr *MI, unsigned Reg) const {
return false;
}
void LiveVariables::MarkVirtRegAliveInBlock(unsigned reg,
void LiveVariables::MarkVirtRegAliveInBlock(VarInfo& VRInfo,
MachineBasicBlock *DefBlock,
MachineBasicBlock *MBB,
std::vector<MachineBasicBlock*> &WorkList) {
unsigned BBNum = MBB->getNumber();
VarInfo& VRInfo = getVarInfo(reg);
// Check to see if this basic block is one of the killing blocks. If so,
// remove it...
@ -127,8 +126,7 @@ void LiveVariables::MarkVirtRegAliveInBlock(unsigned reg,
break;
}
MachineRegisterInfo& MRI = MBB->getParent()->getRegInfo();
if (MBB == MRI.getVRegDef(reg)->getParent()) return; // Terminate recursion
if (MBB == DefBlock) return; // Terminate recursion
if (VRInfo.AliveBlocks[BBNum])
return; // We already know the block is live
@ -141,14 +139,15 @@ void LiveVariables::MarkVirtRegAliveInBlock(unsigned reg,
WorkList.push_back(*PI);
}
void LiveVariables::MarkVirtRegAliveInBlock(unsigned reg,
void LiveVariables::MarkVirtRegAliveInBlock(VarInfo& VRInfo,
MachineBasicBlock *DefBlock,
MachineBasicBlock *MBB) {
std::vector<MachineBasicBlock*> WorkList;
MarkVirtRegAliveInBlock(reg, MBB, WorkList);
MarkVirtRegAliveInBlock(VRInfo, DefBlock, MBB, WorkList);
while (!WorkList.empty()) {
MachineBasicBlock *Pred = WorkList.back();
WorkList.pop_back();
MarkVirtRegAliveInBlock(reg, Pred, WorkList);
MarkVirtRegAliveInBlock(VRInfo, DefBlock, Pred, WorkList);
}
}
@ -190,7 +189,7 @@ void LiveVariables::HandleVirtRegUse(unsigned reg, MachineBasicBlock *MBB,
// Update all dominating blocks to mark them known live.
for (MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(),
E = MBB->pred_end(); PI != E; ++PI)
MarkVirtRegAliveInBlock(reg, *PI);
MarkVirtRegAliveInBlock(VRInfo, MRI.getVRegDef(reg)->getParent(), *PI);
}
bool LiveVariables::addRegisterKilled(unsigned IncomingReg, MachineInstr *MI,
@ -432,6 +431,7 @@ void LiveVariables::HandlePhysRegDef(unsigned Reg, MachineInstr *MI) {
bool LiveVariables::runOnMachineFunction(MachineFunction &mf) {
MF = &mf;
RegInfo = MF->getTarget().getRegisterInfo();
MachineRegisterInfo& MRI = mf.getRegInfo();
assert(RegInfo && "Target doesn't have register information?");
ReservedRegisters = RegInfo->getReservedRegs(mf);
@ -523,7 +523,8 @@ bool LiveVariables::runOnMachineFunction(MachineFunction &mf) {
for (SmallVector<unsigned, 4>::iterator I = VarInfoVec.begin(),
E = VarInfoVec.end(); I != E; ++I) {
// Only mark it alive only in the block we are representing.
MarkVirtRegAliveInBlock(*I, MBB);
MarkVirtRegAliveInBlock(getVarInfo(*I), MRI.getVRegDef(*I)->getParent(),
MBB);
}
}
@ -560,7 +561,6 @@ bool LiveVariables::runOnMachineFunction(MachineFunction &mf) {
// Convert and transfer the dead / killed information we have gathered into
// VirtRegInfo onto MI's.
//
MachineRegisterInfo& MRI = mf.getRegInfo();
for (unsigned i = 0, e1 = VirtRegInfo.size(); i != e1; ++i)
for (unsigned j = 0, e2 = VirtRegInfo[i].Kills.size(); j != e2; ++j) {
if (VirtRegInfo[i].Kills[j] == MRI.getVRegDef(i +