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Use regunit liveness to guide LiveDebugVariables.

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This should produce the same results as using physreg liveness directly.

llvm-svn: 159009
This commit is contained in:
Jakob Stoklund Olesen 2012-06-22 17:15:32 +00:00
parent 0d48b013fb
commit 4a4346d2da
1 changed files with 18 additions and 5 deletions
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23
lib/CodeGen/LiveDebugVariables.cpp
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@ -243,7 +243,7 @@ public:
/// computeIntervals - Compute the live intervals of all locations after
/// collecting all their def points.
void computeIntervals(MachineRegisterInfo &MRI,
void computeIntervals(MachineRegisterInfo &MRI, const TargetRegisterInfo &TRI,
LiveIntervals &LIS, MachineDominatorTree &MDT,
UserValueScopes &UVS);
@ -618,6 +618,7 @@ UserValue::addDefsFromCopies(LiveInterval *LI, unsigned LocNo,
void
UserValue::computeIntervals(MachineRegisterInfo &MRI,
const TargetRegisterInfo &TRI,
LiveIntervals &LIS,
MachineDominatorTree &MDT,
UserValueScopes &UVS) {
@ -634,15 +635,27 @@ UserValue::computeIntervals(MachineRegisterInfo &MRI,
unsigned LocNo = Defs[i].second;
const MachineOperand &Loc = locations[LocNo];
if (!Loc.isReg()) {
extendDef(Idx, LocNo, 0, 0, 0, LIS, MDT, UVS);
continue;
}
// Register locations are constrained to where the register value is live.
if (Loc.isReg() && LIS.hasInterval(Loc.getReg())) {
if (TargetRegisterInfo::isVirtualRegister(Loc.getReg())) {
LiveInterval *LI = &LIS.getInterval(Loc.getReg());
const VNInfo *VNI = LI->getVNInfoAt(Idx);
SmallVector<SlotIndex, 16> Kills;
extendDef(Idx, LocNo, LI, VNI, &Kills, LIS, MDT, UVS);
addDefsFromCopies(LI, LocNo, Kills, Defs, MRI, LIS);
} else
extendDef(Idx, LocNo, 0, 0, 0, LIS, MDT, UVS);
continue;
}
// For physregs, use the live range of the first regunit as a guide.
unsigned Unit = *MCRegUnitIterator(Loc.getReg(), &TRI);
LiveInterval *LI = &LIS.getRegUnit(Unit);
const VNInfo *VNI = LI->getVNInfoAt(Idx);
// Don't track copies from physregs, it is too expensive.
extendDef(Idx, LocNo, LI, VNI, 0, LIS, MDT, UVS);
}
// Finally, erase all the undefs.
@ -656,7 +669,7 @@ UserValue::computeIntervals(MachineRegisterInfo &MRI,
void LDVImpl::computeIntervals() {
for (unsigned i = 0, e = userValues.size(); i != e; ++i) {
UserValueScopes UVS(userValues[i]->getDebugLoc(), LS);
userValues[i]->computeIntervals(MF->getRegInfo(), *LIS, *MDT, UVS);
userValues[i]->computeIntervals(MF->getRegInfo(), *TRI, *LIS, *MDT, UVS);
userValues[i]->mapVirtRegs(this);
}
}