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misched: Added handleMove support for updating all kill flags, not just for allocatable regs.

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This is a medium term workaround until we have a more robust solution
in the form of a register liveness utility for postRA passes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166001 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2012-10-16 00:22:51 +00:00
parent feab72c20a
commit 27c28cef11
4 changed files with 55 additions and 12 deletions
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lib/CodeGen/LiveIntervalAnalysis.cpp
+20 -7
View File
@@ -1011,12 +1011,24 @@ private:
SlotIndex OldIdx;
SlotIndex NewIdx;
SmallPtrSet<LiveInterval*, 8> Updated;
bool UpdateFlags;
public:
HMEditor(LiveIntervals& LIS, const MachineRegisterInfo& MRI,
const TargetRegisterInfo& TRI,
SlotIndex OldIdx, SlotIndex NewIdx)
: LIS(LIS), MRI(MRI), TRI(TRI), OldIdx(OldIdx), NewIdx(NewIdx) {}
SlotIndex OldIdx, SlotIndex NewIdx, bool UpdateFlags)
: LIS(LIS), MRI(MRI), TRI(TRI), OldIdx(OldIdx), NewIdx(NewIdx),
UpdateFlags(UpdateFlags) {}
// FIXME: UpdateFlags is a workaround that creates live intervals for all
// physregs, even those that aren't needed for regalloc, in order to update
// kill flags. This is wasteful. Eventually, LiveVariables will strip all kill
// flags, and postRA passes will use a live register utility instead.
LiveInterval *getRegUnitLI(unsigned Unit) {
if (UpdateFlags)
return &LIS.getRegUnit(Unit);
return LIS.getCachedRegUnit(Unit);
}
/// Update all live ranges touched by MI, assuming a move from OldIdx to
/// NewIdx.
@@ -1044,7 +1056,7 @@ public:
// For physregs, only update the regunits that actually have a
// precomputed live range.
for (MCRegUnitIterator Units(Reg, &TRI); Units.isValid(); ++Units)
if (LiveInterval *LI = LIS.getCachedRegUnit(*Units))
if (LiveInterval *LI = getRegUnitLI(*Units))
updateRange(*LI);
}
if (hasRegMask)
@@ -1288,7 +1300,7 @@ private:
}
};
void LiveIntervals::handleMove(MachineInstr* MI) {
void LiveIntervals::handleMove(MachineInstr* MI, bool UpdateFlags) {
assert(!MI->isBundled() && "Can't handle bundled instructions yet.");
SlotIndex OldIndex = Indexes->getInstructionIndex(MI);
Indexes->removeMachineInstrFromMaps(MI);
@@ -1297,14 +1309,15 @@ void LiveIntervals::handleMove(MachineInstr* MI) {
OldIndex < getMBBEndIdx(MI->getParent()) &&
"Cannot handle moves across basic block boundaries.");
HMEditor HME(*this, *MRI, *TRI, OldIndex, NewIndex);
HMEditor HME(*this, *MRI, *TRI, OldIndex, NewIndex, UpdateFlags);
HME.updateAllRanges(MI);
}
void LiveIntervals::handleMoveIntoBundle(MachineInstr* MI,
MachineInstr* BundleStart) {
MachineInstr* BundleStart,
bool UpdateFlags) {
SlotIndex OldIndex = Indexes->getInstructionIndex(MI);
SlotIndex NewIndex = Indexes->getInstructionIndex(BundleStart);
HMEditor HME(*this, *MRI, *TRI, OldIndex, NewIndex);
HMEditor HME(*this, *MRI, *TRI, OldIndex, NewIndex, UpdateFlags);
HME.updateAllRanges(MI);
}