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[PHIElim] Use ranges and const-ify, NFC.

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llvm-svn: 239508
This commit is contained in:
Arnaud A. de Grandmaison 2015-06-11 07:45:05 +00:00
parent d737ff7af7
commit 15dd6a1961
1 changed files with 11 additions and 12 deletions
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23
lib/CodeGen/PHIElimination.cpp
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@ -88,8 +88,8 @@ namespace {
// These functions are temporary abstractions around LiveVariables and
// LiveIntervals, so they can go away when LiveVariables does.
bool isLiveIn(unsigned Reg, MachineBasicBlock *MBB);
bool isLiveOutPastPHIs(unsigned Reg, MachineBasicBlock *MBB);
bool isLiveIn(unsigned Reg, const MachineBasicBlock *MBB);
bool isLiveOutPastPHIs(unsigned Reg, const MachineBasicBlock *MBB);
typedef std::pair<unsigned, unsigned> BBVRegPair;
typedef DenseMap<BBVRegPair, unsigned> VRegPHIUse;
@ -143,16 +143,16 @@ bool PHIElimination::runOnMachineFunction(MachineFunction &MF) {
// updating LiveIntervals, so we disable it.
if (!DisableEdgeSplitting && (LV || LIS)) {
MachineLoopInfo *MLI = getAnalysisIfAvailable<MachineLoopInfo>();
for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
Changed |= SplitPHIEdges(MF, *I, MLI);
for (auto &MBB : MF)
Changed |= SplitPHIEdges(MF, MBB, MLI);
}
// Populate VRegPHIUseCount
analyzePHINodes(MF);
// Eliminate PHI instructions by inserting copies into predecessor blocks.
for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
Changed |= EliminatePHINodes(MF, *I);
for (auto &MBB : MF)
Changed |= EliminatePHINodes(MF, MBB);
// Remove dead IMPLICIT_DEF instructions.
for (MachineInstr *DefMI : ImpDefs) {
@ -623,7 +623,7 @@ bool PHIElimination::SplitPHIEdges(MachineFunction &MF,
return Changed;
}
bool PHIElimination::isLiveIn(unsigned Reg, MachineBasicBlock *MBB) {
bool PHIElimination::isLiveIn(unsigned Reg, const MachineBasicBlock *MBB) {
assert((LV || LIS) &&
"isLiveIn() requires either LiveVariables or LiveIntervals");
if (LIS)
@ -632,7 +632,8 @@ bool PHIElimination::isLiveIn(unsigned Reg, MachineBasicBlock *MBB) {
return LV->isLiveIn(Reg, *MBB);
}
bool PHIElimination::isLiveOutPastPHIs(unsigned Reg, MachineBasicBlock *MBB) {
bool PHIElimination::isLiveOutPastPHIs(unsigned Reg,
const MachineBasicBlock *MBB) {
assert((LV || LIS) &&
"isLiveOutPastPHIs() requires either LiveVariables or LiveIntervals");
// LiveVariables considers uses in PHIs to be in the predecessor basic block,
@ -642,11 +643,9 @@ bool PHIElimination::isLiveOutPastPHIs(unsigned Reg, MachineBasicBlock *MBB) {
// out of the block.
if (LIS) {
const LiveInterval &LI = LIS->getInterval(Reg);
for (MachineBasicBlock::succ_iterator SI = MBB->succ_begin(),
SE = MBB->succ_end(); SI != SE; ++SI) {
if (LI.liveAt(LIS->getMBBStartIdx(*SI)))
for (const MachineBasicBlock *SI : MBB->successors())
if (LI.liveAt(LIS->getMBBStartIdx(SI)))
return true;
}
return false;
} else {
return LV->isLiveOut(Reg, *MBB);