RPCS3/llvm
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm.git synced 2024-12-04 17:58:22 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Handle recursive PHI's.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90575 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-12-04 19:09:10 +00:00
parent 954c80e99d
commit 11572babb1
1 changed files with 18 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
lib/CodeGen/TailDuplication.cpp
View File

@ -38,7 +38,7 @@ TailDuplicateSize("tail-dup-size",
cl::desc("Maximum instructions to consider tail duplicating"),
cl::init(2), cl::Hidden);
typedef std::vector<unsigned> AvailableValsTy;
typedef std::vector<std::pair<MachineBasicBlock*,unsigned> > AvailableValsTy;
namespace {
/// TailDuplicatePass - Perform tail duplication.
@ -64,7 +64,8 @@ namespace {
virtual const char *getPassName() const { return "Tail Duplication"; }
private:
void AddSSAUpdateEntry(unsigned OrigReg, unsigned NewReg);
void AddSSAUpdateEntry(unsigned OrigReg, unsigned NewReg,
MachineBasicBlock *BB);
void ProcessPHI(MachineInstr *MI, MachineBasicBlock *TailBB,
MachineBasicBlock *PredBB,
DenseMap<unsigned, unsigned> &LocalVRMap);
@ -151,14 +152,14 @@ static unsigned getPHISrcRegOpIdx(MachineInstr *MI, MachineBasicBlock *SrcBB) {
/// AddSSAUpdateEntry - Add a definition and source virtual registers pair for
/// SSA update.
void TailDuplicatePass::AddSSAUpdateEntry(unsigned OrigReg, unsigned NewReg) {
DenseMap<unsigned, AvailableValsTy>::iterator LI =
SSAUpdateVals.find(OrigReg);
void TailDuplicatePass::AddSSAUpdateEntry(unsigned OrigReg, unsigned NewReg,
MachineBasicBlock *BB) {
DenseMap<unsigned, AvailableValsTy>::iterator LI= SSAUpdateVals.find(OrigReg);
if (LI != SSAUpdateVals.end())
LI->second.push_back(NewReg);
LI->second.push_back(std::make_pair(BB, NewReg));
else {
AvailableValsTy Vals;
Vals.push_back(NewReg);
Vals.push_back(std::make_pair(BB, NewReg));
SSAUpdateVals.insert(std::make_pair(OrigReg, Vals));
SSAUpdateVRs.push_back(OrigReg);
}
@ -176,7 +177,7 @@ void TailDuplicatePass::ProcessPHI(MachineInstr *MI,
unsigned SrcReg = MI->getOperand(SrcOpIdx).getReg();
LocalVRMap.insert(std::make_pair(DefReg, SrcReg));
if (isDefLiveOut(DefReg, TailBB, MRI))
AddSSAUpdateEntry(DefReg, SrcReg);
AddSSAUpdateEntry(DefReg, SrcReg, PredBB);
// Remove PredBB from the PHI node.
MI->RemoveOperand(SrcOpIdx+1);
@ -206,7 +207,7 @@ void TailDuplicatePass::DuplicateInstruction(MachineInstr *MI,
MO.setReg(NewReg);
LocalVRMap.insert(std::make_pair(Reg, NewReg));
if (isDefLiveOut(Reg, TailBB, MRI))
AddSSAUpdateEntry(Reg, NewReg);
AddSSAUpdateEntry(Reg, NewReg, PredBB);
} else {
DenseMap<unsigned, unsigned>::iterator VI = LocalVRMap.find(Reg);
if (VI != LocalVRMap.end())
@ -240,15 +241,14 @@ void TailDuplicatePass::UpdateSuccessorsPHIs(MachineBasicBlock *FromBB,
II->RemoveOperand(i+1);
II->RemoveOperand(i);
}
DenseMap<unsigned, AvailableValsTy>::iterator LI =
SSAUpdateVals.find(Reg);
DenseMap<unsigned,AvailableValsTy>::iterator LI=SSAUpdateVals.find(Reg);
if (LI == SSAUpdateVals.end())
break;
for (unsigned j = 0, ee = LI->second.size(); j != ee; ++j) {
unsigned NewReg = LI->second[j];
MachineInstr *DefMI = MRI->getVRegDef(NewReg);
II->addOperand(MachineOperand::CreateReg(NewReg, false));
II->addOperand(MachineOperand::CreateMBB(DefMI->getParent()));
MachineBasicBlock *SrcBB = LI->second[j].first;
unsigned SrcReg = LI->second[j].second;
II->addOperand(MachineOperand::CreateReg(SrcReg, false));
II->addOperand(MachineOperand::CreateMBB(SrcBB));
}
break;
}
@ -449,9 +449,9 @@ bool TailDuplicatePass::TailDuplicate(MachineBasicBlock *TailBB,
DenseMap<unsigned, AvailableValsTy>::iterator LI =
SSAUpdateVals.find(VReg);
for (unsigned j = 0, ee = LI->second.size(); j != ee; ++j) {
unsigned NewReg = LI->second[j];
MachineInstr *DefMI = MRI->getVRegDef(NewReg);
SSAUpdate.AddAvailableValue(DefMI->getParent(), NewReg);
MachineBasicBlock *SrcBB = LI->second[j].first;
unsigned SrcReg = LI->second[j].second;
SSAUpdate.AddAvailableValue(SrcBB, SrcReg);
}
// Rewrite uses that are outside of the original def's block.