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Improve the LiveInterval class to keep track of which machine instruction

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defines each value# tracked by the interval.  This will be used to improve
coallescing.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29830 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-08-22 18:19:46 +00:00
parent ad6f758f89
commit be4f88a8b8
3 changed files with 63 additions and 19 deletions
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41
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -328,7 +328,7 @@ addIntervalsForSpills(const LiveInterval &li, VirtRegMap &vrm, int slot) {
// the spill weight is now infinity as it
// cannot be spilled again
nI.weight = float(HUGE_VAL);
LiveRange LR(start, end, nI.getNextValue());
LiveRange LR(start, end, nI.getNextValue(~0U));
DEBUG(std::cerr << " +" << LR);
nI.addRange(LR);
added.push_back(&nI);
@ -351,18 +351,16 @@ addIntervalsForSpills(const LiveInterval &li, VirtRegMap &vrm, int slot) {
return added;
}
void LiveIntervals::printRegName(unsigned reg) const
{
void LiveIntervals::printRegName(unsigned reg) const {
if (MRegisterInfo::isPhysicalRegister(reg))
std::cerr << mri_->getName(reg);
else
std::cerr << "%reg" << reg;
}
void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock* mbb,
void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
MachineBasicBlock::iterator mi,
LiveInterval& interval)
{
LiveInterval &interval) {
DEBUG(std::cerr << "\t\tregister: "; printRegName(interval.reg));
LiveVariables::VarInfo& vi = lv_->getVarInfo(interval.reg);
@ -374,7 +372,7 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock* mbb,
// Get the Idx of the defining instructions.
unsigned defIndex = getDefIndex(getInstructionIndex(mi));
unsigned ValNum = interval.getNextValue();
unsigned ValNum = interval.getNextValue(defIndex);
assert(ValNum == 0 && "First value in interval is not 0?");
ValNum = 0; // Clue in the optimizer.
@ -456,10 +454,22 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock* mbb,
unsigned RedefIndex = getDefIndex(getInstructionIndex(mi));
// Delete the initial value, which should be short and continuous,
// becuase the 2-addr copy must be in the same MBB as the redef.
// because the 2-addr copy must be in the same MBB as the redef.
interval.removeRange(DefIndex, RedefIndex);
LiveRange LR(DefIndex, RedefIndex, interval.getNextValue());
// Two-address vregs should always only be redefined once. This means
// that at this point, there should be exactly one value number in it.
assert(interval.containsOneValue() && "Unexpected 2-addr liveint!");
// The new value number is defined by the instruction we claimed defined
// value #0.
unsigned ValNo = interval.getNextValue(DefIndex);
// Value#1 is now defined by the 2-addr instruction.
interval.setInstDefiningValNum(0, RedefIndex);
// Add the new live interval which replaces the range for the input copy.
LiveRange LR(DefIndex, RedefIndex, ValNo);
DEBUG(std::cerr << " replace range with " << LR);
interval.addRange(LR);
@ -487,8 +497,9 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock* mbb,
interval.removeRange(Start, End);
DEBUG(std::cerr << "RESULT: " << interval);
// Replace the interval with one of a NEW value number.
LiveRange LR(Start, End, interval.getNextValue());
// Replace the interval with one of a NEW value number. Note that this
// value number isn't actually defined by an instruction, weird huh? :)
LiveRange LR(Start, End, interval.getNextValue(~0U));
DEBUG(std::cerr << " replace range with " << LR);
interval.addRange(LR);
DEBUG(std::cerr << "RESULT: " << interval);
@ -500,7 +511,7 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock* mbb,
unsigned defIndex = getDefIndex(getInstructionIndex(mi));
LiveRange LR(defIndex,
getInstructionIndex(&mbb->back()) + InstrSlots::NUM,
interval.getNextValue());
interval.getNextValue(defIndex));
interval.addRange(LR);
DEBUG(std::cerr << " +" << LR);
}
@ -513,8 +524,7 @@ void LiveIntervals::handlePhysicalRegisterDef(MachineBasicBlock *MBB,
MachineBasicBlock::iterator mi,
LiveInterval& interval,
unsigned SrcReg, unsigned DestReg,
bool isLiveIn)
{
bool isLiveIn) {
// A physical register cannot be live across basic block, so its
// lifetime must end somewhere in its defining basic block.
DEBUG(std::cerr << "\t\tregister: "; printRegName(interval.reg));
@ -591,8 +601,7 @@ exit:
}
}
LiveRange LR(start, end, interval.getNextValue());
LiveRange LR(start, end, interval.getNextValue(start));
interval.addRange(LR);
DEBUG(std::cerr << " +" << LR << '\n');
}