maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Dead code elimination 

llvm-svn: 96837
This commit is contained in:
Jakob Stoklund Olesen 2010-02-23 00:28:53 +00:00
parent 46841e1bd9
commit 012d4369f6
2 changed files with 0 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
llvm/lib/CodeGen/PHIElimination.cpp
View File

@ -55,7 +55,6 @@ void llvm::PHIElimination::getAnalysisUsage(AnalysisUsage &AU) const {
bool llvm::PHIElimination::runOnMachineFunction(MachineFunction &Fn) {
MRI = &Fn.getRegInfo();
PHIDefs.clear();
bool Changed = false;
// Split critical edges to help the coalescer
@ -214,10 +213,6 @@ void llvm::PHIElimination::LowerAtomicPHINode(
TII->copyRegToReg(MBB, AfterPHIsIt, DestReg, IncomingReg, RC, RC);
}
// Record PHI def.
assert(!hasPHIDef(DestReg) && "Vreg has multiple phi-defs?");
PHIDefs[DestReg] = &MBB;
// Update live variable information if there is any.
LiveVariables *LV = getAnalysisIfAvailable<LiveVariables>();
if (LV) {

9
llvm/lib/CodeGen/PHIElimination.h
View File

@ -22,10 +22,8 @@ namespace llvm {
/// Lower PHI instructions to copies.
class PHIElimination : public MachineFunctionPass {
MachineRegisterInfo *MRI; // Machine register information
typedef DenseMap<unsigned, MachineBasicBlock*> PHIDefMap;
public:
static char ID; // Pass identification, replacement for typeid
PHIElimination() : MachineFunctionPass(&ID) {}
@ -33,12 +31,6 @@ namespace llvm {
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
/// Return true if the given vreg was defined by a PHI intsr prior to
/// lowering.
bool hasPHIDef(unsigned vreg) const {
return PHIDefs.count(vreg);
}
private:
/// EliminatePHINodes - Eliminate phi nodes by inserting copy instructions
/// in predecessor basic blocks.
@ -106,7 +98,6 @@ namespace llvm {
typedef DenseMap<BBVRegPair, unsigned> VRegPHIUse;
VRegPHIUse VRegPHIUseCount;
PHIDefMap PHIDefs;
// Defs of PHI sources which are implicit_def.
SmallPtrSet<MachineInstr*, 4> ImpDefs;