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Dead code elimination.

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llvm-svn: 96496
This commit is contained in:
Jakob Stoklund Olesen 2010-02-17 19:13:56 +00:00
parent 5f903139fa
commit e7862f29ec
2 changed files with 0 additions and 38 deletions
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4
lib/CodeGen/PHIElimination.cpp
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@ -56,7 +56,6 @@ bool llvm::PHIElimination::runOnMachineFunction(MachineFunction &Fn) {
MRI = &Fn.getRegInfo();
PHIDefs.clear();
PHIKills.clear();
bool Changed = false;
// Split critical edges to help the coalescer
@ -276,9 +275,6 @@ void llvm::PHIElimination::LowerAtomicPHINode(
// path the PHI.
MachineBasicBlock &opBlock = *MPhi->getOperand(i*2+2).getMBB();
// Record the kill.
PHIKills[SrcReg].insert(&opBlock);
// If source is defined by an implicit def, there is no need to insert a
// copy.
MachineInstr *DefMI = MRI->getVRegDef(SrcReg);

34
lib/CodeGen/PHIElimination.h
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@ -22,17 +22,10 @@ namespace llvm {
/// Lower PHI instructions to copies.
class PHIElimination : public MachineFunctionPass {
MachineRegisterInfo *MRI; // Machine register information
private:
typedef SmallSet<MachineBasicBlock*, 4> PHIKillList;
typedef DenseMap<unsigned, PHIKillList> PHIKillMap;
typedef DenseMap<unsigned, MachineBasicBlock*> PHIDefMap;
public:
typedef PHIKillList::iterator phi_kill_iterator;
typedef PHIKillList::const_iterator const_phi_kill_iterator;
static char ID; // Pass identification, replacement for typeid
PHIElimination() : MachineFunctionPass(&ID) {}
@ -46,32 +39,6 @@ namespace llvm {
return PHIDefs.count(vreg);
}
/// Returns the block in which the PHI instruction which defined the
/// given vreg used to reside.
MachineBasicBlock* getPHIDefBlock(unsigned vreg) {
PHIDefMap::iterator phiDefItr = PHIDefs.find(vreg);
assert(phiDefItr != PHIDefs.end() && "vreg has no phi-def.");
return phiDefItr->second;
}
/// Returns true if the given vreg was killed by a PHI instr.
bool hasPHIKills(unsigned vreg) const {
return PHIKills.count(vreg);
}
/// Returns an iterator over the BasicBlocks which contained PHI
/// kills of this register prior to lowering.
phi_kill_iterator phiKillsBegin(unsigned vreg) {
PHIKillMap::iterator phiKillItr = PHIKills.find(vreg);
assert(phiKillItr != PHIKills.end() && "vreg has no phi-kills.");
return phiKillItr->second.begin();
}
phi_kill_iterator phiKillsEnd(unsigned vreg) {
PHIKillMap::iterator phiKillItr = PHIKills.find(vreg);
assert(phiKillItr != PHIKills.end() && "vreg has no phi-kills.");
return phiKillItr->second.end();
}
private:
/// EliminatePHINodes - Eliminate phi nodes by inserting copy instructions
/// in predecessor basic blocks.
@ -140,7 +107,6 @@ namespace llvm {
VRegPHIUse VRegPHIUseCount;
PHIDefMap PHIDefs;
PHIKillMap PHIKills;
// Defs of PHI sources which are implicit_def.
SmallPtrSet<MachineInstr*, 4> ImpDefs;