#include "llvm/CodeGen/LiveVariables.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
-#include "Support/DenseMap.h"
-#include "Support/STLExtras.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/STLExtras.h"
using namespace llvm;
namespace {
return false; // Quick exit for normal case...
LiveVariables *LV = getAnalysisToUpdate<LiveVariables>();
- const TargetInstrInfo &MII = MF.getTarget().getInstrInfo();
+ const TargetInstrInfo &MII = *MF.getTarget().getInstrInfo();
const MRegisterInfo *RegInfo = MF.getTarget().getRegisterInfo();
// VRegPHIUseCount - Keep track of the number of times each virtual register
++AfterPHIsIt; // Skip over all of the PHI nodes...
while (MBB.front().getOpcode() == TargetInstrInfo::PHI) {
- // Unlink the PHI node from the basic block... but don't delete the PHI yet
- MachineInstr *MI = MBB.remove(MBB.begin());
+ // Unlink the PHI node from the basic block, but don't delete the PHI yet.
+ MachineInstr *MPhi = MBB.remove(MBB.begin());
- assert(MRegisterInfo::isVirtualRegister(MI->getOperand(0).getReg()) &&
+ assert(MRegisterInfo::isVirtualRegister(MPhi->getOperand(0).getReg()) &&
"PHI node doesn't write virt reg?");
- unsigned DestReg = MI->getOperand(0).getReg();
+ unsigned DestReg = MPhi->getOperand(0).getReg();
// Create a new register for the incoming PHI arguments
const TargetRegisterClass *RC = MF.getSSARegMap()->getRegClass(DestReg);
// each for each incoming block), the "def" block and instruction fields
// for the VarInfo is not filled in.
//
- LV->addVirtualRegisterKilled(IncomingReg, &MBB, PHICopy);
+ LV->addVirtualRegisterKilled(IncomingReg, PHICopy);
// Since we are going to be deleting the PHI node, if it is the last use
// of any registers, or if the value itself is dead, we need to move this
- // information over to the new copy we just inserted...
+ // information over to the new copy we just inserted.
//
std::pair<LiveVariables::killed_iterator, LiveVariables::killed_iterator>
- RKs = LV->killed_range(MI);
+ RKs = LV->killed_range(MPhi);
std::vector<std::pair<MachineInstr*, unsigned> > Range;
- if (RKs.first != RKs.second) {
- // Copy the range into a vector...
- Range.assign(RKs.first, RKs.second);
-
- // Delete the range...
+ if (RKs.first != RKs.second) // Delete the range.
LV->removeVirtualRegistersKilled(RKs.first, RKs.second);
- // Add all of the kills back, which will update the appropriate info...
- for (unsigned i = 0, e = Range.size(); i != e; ++i)
- LV->addVirtualRegisterKilled(Range[i].second, &MBB, PHICopy);
- }
-
- RKs = LV->dead_range(MI);
+ RKs = LV->dead_range(MPhi);
if (RKs.first != RKs.second) {
// Works as above...
Range.assign(RKs.first, RKs.second);
LV->removeVirtualRegistersDead(RKs.first, RKs.second);
for (unsigned i = 0, e = Range.size(); i != e; ++i)
- LV->addVirtualRegisterDead(Range[i].second, &MBB, PHICopy);
+ LV->addVirtualRegisterDead(Range[i].second, PHICopy);
}
}
// Adjust the VRegPHIUseCount map to account for the removal of this PHI
// node.
- for (unsigned i = 1; i != MI->getNumOperands(); i += 2)
- VRegPHIUseCount[MI->getOperand(i).getReg()] -= BBIsSuccOfPreds;
+ for (unsigned i = 1; i != MPhi->getNumOperands(); i += 2)
+ VRegPHIUseCount[MPhi->getOperand(i).getReg()] -= BBIsSuccOfPreds;
// Now loop over all of the incoming arguments, changing them to copy into
// the IncomingReg register in the corresponding predecessor basic block.
//
- for (int i = MI->getNumOperands() - 1; i >= 2; i-=2) {
- MachineOperand &opVal = MI->getOperand(i-1);
+ for (int i = MPhi->getNumOperands() - 1; i >= 2; i-=2) {
+ MachineOperand &opVal = MPhi->getOperand(i-1);
// Get the MachineBasicBlock equivalent of the BasicBlock that is the
// source path the PHI.
- MachineBasicBlock &opBlock = *MI->getOperand(i).getMachineBasicBlock();
+ MachineBasicBlock &opBlock = *MPhi->getOperand(i).getMachineBasicBlock();
MachineBasicBlock::iterator I = opBlock.getFirstTerminator();
MachineBasicBlock *SuccMBB = *SI;
// Is it alive in this successor?
- unsigned SuccIdx = LV->getMachineBasicBlockIndex(SuccMBB);
+ unsigned SuccIdx = SuccMBB->getNumber();
if (SuccIdx < InRegVI.AliveBlocks.size() &&
InRegVI.AliveBlocks[SuccIdx]) {
ValueIsLive = true;
// Is it killed in this successor?
for (unsigned i = 0, e = InRegVI.Kills.size(); i != e; ++i)
- if (InRegVI.Kills[i].first == SuccMBB) {
+ if (InRegVI.Kills[i]->getParent() == SuccMBB) {
ValueIsLive = true;
break;
}
//
if (!ValueIsLive) {
MachineBasicBlock::iterator Prev = prior(I);
- LV->addVirtualRegisterKilled(SrcReg, &opBlock, Prev);
+ LV->addVirtualRegisterKilled(SrcReg, Prev);
+
+ // This vreg no longer lives all of the way through opBlock.
+ unsigned opBlockNum = opBlock.getNumber();
+ if (opBlockNum < InRegVI.AliveBlocks.size())
+ InRegVI.AliveBlocks[opBlockNum] = false;
}
}
}
}
- // really delete the PHI instruction now!
- delete MI;
+ // Really delete the PHI instruction now!
+ delete MPhi;
}
return true;
}