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Eliminate MarkVirtRegAliveInBlock recursion.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36943 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-05-08 19:00:00 +00:00
parent 6603d7ec67
commit 56184904cd
2 changed files with 19 additions and 4 deletions
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2
include/llvm/CodeGen/LiveVariables.h
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@ -283,6 +283,8 @@ public:
VarInfo &getVarInfo(unsigned RegIdx);
void MarkVirtRegAliveInBlock(VarInfo &VRInfo, MachineBasicBlock *BB);
void MarkVirtRegAliveInBlock(VarInfo &VRInfo, MachineBasicBlock *BB,
std::vector<MachineBasicBlock*> &WorkList);
void HandleVirtRegUse(VarInfo &VRInfo, MachineBasicBlock *MBB,
MachineInstr *MI);
};

21
lib/CodeGen/LiveVariables.cpp
View File

@ -112,7 +112,8 @@ bool LiveVariables::ModifiesRegister(MachineInstr *MI, unsigned Reg) const {
}
void LiveVariables::MarkVirtRegAliveInBlock(VarInfo &VRInfo,
MachineBasicBlock *MBB) {
MachineBasicBlock *MBB,
std::vector<MachineBasicBlock*> &WorkList) {
unsigned BBNum = MBB->getNumber();
// Check to see if this basic block is one of the killing blocks. If so,
@ -131,11 +132,23 @@ void LiveVariables::MarkVirtRegAliveInBlock(VarInfo &VRInfo,
// Mark the variable known alive in this bb
VRInfo.AliveBlocks[BBNum] = true;
for (MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(),
E = MBB->pred_end(); PI != E; ++PI)
MarkVirtRegAliveInBlock(VRInfo, *PI);
for (MachineBasicBlock::const_pred_reverse_iterator PI = MBB->pred_rbegin(),
E = MBB->pred_rend(); PI != E; ++PI)
WorkList.push_back(*PI);
}
void LiveVariables::MarkVirtRegAliveInBlock(VarInfo &VRInfo,
MachineBasicBlock *MBB) {
std::vector<MachineBasicBlock*> WorkList;
MarkVirtRegAliveInBlock(VRInfo, MBB, WorkList);
while (!WorkList.empty()) {
MachineBasicBlock *Pred = WorkList.back();
WorkList.pop_back();
MarkVirtRegAliveInBlock(VRInfo, Pred, WorkList);
}
}
void LiveVariables::HandleVirtRegUse(VarInfo &VRInfo, MachineBasicBlock *MBB,
MachineInstr *MI) {
assert(VRInfo.DefInst && "Register use before def!");