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Change an argument to a LiveInterval instead of a register number to save some redundant lookups.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127964 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-03-20 05:44:55 +00:00
parent 579967a7ec
commit 01a46c82e0
1 changed files with 13 additions and 13 deletions
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26
lib/CodeGen/InlineSpiller.cpp
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@ -124,7 +124,7 @@ private:
void analyzeSiblingValues();
bool hoistSpill(LiveInterval &SpillLI, MachineInstr *CopyMI);
void eliminateRedundantSpills(unsigned Reg, VNInfo *VNI);
void eliminateRedundantSpills(LiveInterval &LI, VNInfo *VNI);
bool reMaterializeFor(MachineBasicBlock::iterator MI);
void reMaterializeAll();
@ -444,7 +444,7 @@ bool InlineSpiller::hoistSpill(LiveInterval &SpillLI, MachineInstr *CopyMI) {
// We are going to spill SVI.SpillVNI immediately after its def, so clear out
// any later spills of the same value.
eliminateRedundantSpills(SVI.SpillReg, SVI.SpillVNI);
eliminateRedundantSpills(LIS.getInterval(SVI.SpillReg), SVI.SpillVNI);
MachineBasicBlock *MBB = LIS.getMBBFromIndex(SVI.SpillVNI->def);
MachineBasicBlock::iterator MII;
@ -463,15 +463,17 @@ bool InlineSpiller::hoistSpill(LiveInterval &SpillLI, MachineInstr *CopyMI) {
return true;
}
/// eliminateRedundantSpills - Reg:VNI is known to be on the stack. Remove any
/// redundant spills of this value in Reg and sibling copies.
void InlineSpiller::eliminateRedundantSpills(unsigned Reg, VNInfo *VNI) {
SmallVector<std::pair<unsigned, VNInfo*>, 8> WorkList;
WorkList.push_back(std::make_pair(Reg, VNI));
/// eliminateRedundantSpills - SLI:VNI is known to be on the stack. Remove any
/// redundant spills of this value in SLI.reg and sibling copies.
void InlineSpiller::eliminateRedundantSpills(LiveInterval &SLI, VNInfo *VNI) {
SmallVector<std::pair<LiveInterval*, VNInfo*>, 8> WorkList;
WorkList.push_back(std::make_pair(&SLI, VNI));
LiveInterval &StackInt = LSS.getInterval(StackSlot);
do {
tie(Reg, VNI) = WorkList.pop_back_val();
LiveInterval *LI;
tie(LI, VNI) = WorkList.pop_back_val();
unsigned Reg = LI->reg;
DEBUG(dbgs() << "Checking redundant spills for " << PrintReg(Reg) << ':'
<< VNI->id << '@' << VNI->def << '\n');
@ -480,8 +482,7 @@ void InlineSpiller::eliminateRedundantSpills(unsigned Reg, VNInfo *VNI) {
continue;
// Add all of VNI's live range to StackInt.
LiveInterval &LI = LIS.getInterval(Reg);
StackInt.MergeValueInAsValue(LI, VNI, StackInt.getValNumInfo(0));
StackInt.MergeValueInAsValue(*LI, VNI, StackInt.getValNumInfo(0));
DEBUG(dbgs() << "Merged to stack int: " << StackInt << '\n');
// Find all spills and copies of VNI.
@ -490,7 +491,7 @@ void InlineSpiller::eliminateRedundantSpills(unsigned Reg, VNInfo *VNI) {
if (!MI->isCopy() && !MI->getDesc().mayStore())
continue;
SlotIndex Idx = LIS.getInstructionIndex(MI);
if (LI.getVNInfoAt(Idx) != VNI)
if (LI->getVNInfoAt(Idx) != VNI)
continue;
// Follow sibling copies down the dominator tree.
@ -500,7 +501,7 @@ void InlineSpiller::eliminateRedundantSpills(unsigned Reg, VNInfo *VNI) {
VNInfo *DstVNI = DstLI.getVNInfoAt(Idx.getDefIndex());
assert(DstVNI && "Missing defined value");
assert(DstVNI->def == Idx.getDefIndex() && "Wrong copy def slot");
WorkList.push_back(std::make_pair(DstReg, DstVNI));
WorkList.push_back(std::make_pair(&DstLI, DstVNI));
}
continue;
}
@ -841,7 +842,6 @@ void InlineSpiller::spill(LiveRangeEdit &edit) {
Edit = &edit;
assert(!TargetRegisterInfo::isStackSlot(edit.getReg())
&& "Trying to spill a stack slot.");
// Share a stack slot among all descendants of Original.
Original = VRM.getOriginal(edit.getReg());
StackSlot = VRM.getStackSlot(Original);