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Represent RegUnit liveness with LiveRange instance

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Previously LiveInterval has been used, but having a spill weight and
register number is unnecessary for a register unit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192397 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun
2013-10-10 21:29:02 +00:00
parent e25dde550b
commit 4f3b5e8c92
13 changed files with 132 additions and 129 deletions
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22
lib/CodeGen/RegisterPressure.cpp
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@ -147,7 +147,7 @@ void RegionPressure::openBottom(MachineBasicBlock::const_iterator PrevBottom) {
LiveInRegs.clear();
}
const LiveInterval *RegPressureTracker::getInterval(unsigned Reg) const {
const LiveRange *RegPressureTracker::getLiveRange(unsigned Reg) const {
if (TargetRegisterInfo::isVirtualRegister(Reg))
return &LIS->getInterval(Reg);
return LIS->getCachedRegUnit(Reg);
@ -510,10 +510,9 @@ bool RegPressureTracker::recede(SmallVectorImpl<unsigned> *LiveUses,
if (!LiveRegs.contains(Reg)) {
// Adjust liveouts if LiveIntervals are available.
if (RequireIntervals) {
const LiveInterval *LI = getInterval(Reg);
// Check if this LR is killed and not redefined here.
if (LI) {
LiveQueryResult LRQ = LI->Query(SlotIdx);
const LiveRange *LR = getLiveRange(Reg);
if (LR) {
LiveQueryResult LRQ = LR->Query(SlotIdx);
if (!LRQ.isKill() && !LRQ.valueDefined())
discoverLiveOut(Reg);
}
@ -570,8 +569,8 @@ bool RegPressureTracker::advance() {
// Kill liveness at last uses.
bool lastUse = false;
if (RequireIntervals) {
const LiveInterval *LI = getInterval(Reg);
lastUse = LI && LI->Query(SlotIdx).isKill();
const LiveRange *LR = getLiveRange(Reg);
lastUse = LR && LR->Query(SlotIdx).isKill();
}
else {
// Allocatable physregs are always single-use before register rewriting.
@ -894,11 +893,12 @@ void RegPressureTracker::bumpDownwardPressure(const MachineInstr *MI) {
// FIXME: allow the caller to pass in the list of vreg uses that remain
// to be bottom-scheduled to avoid searching uses at each query.
SlotIndex CurrIdx = getCurrSlot();
const LiveInterval *LI = getInterval(Reg);
if (LI) {
LiveQueryResult LRQ = LI->Query(SlotIdx);
if (LRQ.isKill() && !findUseBetween(Reg, CurrIdx, SlotIdx, MRI, LIS))
const LiveRange *LR = getLiveRange(Reg);
if (LR) {
LiveQueryResult LRQ = LR->Query(SlotIdx);
if (LRQ.isKill() && !findUseBetween(Reg, CurrIdx, SlotIdx, MRI, LIS)) {
decreaseRegPressure(Reg);
}
}
}
else if (!TargetRegisterInfo::isVirtualRegister(Reg)) {