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Teach TargetRegisterInfo how to cram stack slot indexes in with the virtual and

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physical register numbers.

This makes the hack used in LiveInterval official, and lets LiveInterval be
oblivious of stack slots.

The isPhysicalRegister() and isVirtualRegister() predicates don't know about
this, so when a variable may contain a stack slot, isStackSlot() should always
be tested first.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123128 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-01-09 21:17:37 +00:00
parent 96b1b6c135
commit be97e906e0
9 changed files with 58 additions and 48 deletions
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16
lib/CodeGen/LiveStackAnalysis.cpp
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@ -50,6 +50,22 @@ bool LiveStacks::runOnMachineFunction(MachineFunction &) {
return false;
}
LiveInterval &
LiveStacks::getOrCreateInterval(int Slot, const TargetRegisterClass *RC) {
assert(Slot >= 0 && "Spill slot indice must be >= 0");
SS2IntervalMap::iterator I = S2IMap.find(Slot);
if (I == S2IMap.end()) {
I = S2IMap.insert(I, std::make_pair(Slot,
LiveInterval(TargetRegisterInfo::index2StackSlot(Slot), 0.0F)));
S2RCMap.insert(std::make_pair(Slot, RC));
} else {
// Use the largest common subclass register class.
const TargetRegisterClass *OldRC = S2RCMap[Slot];
S2RCMap[Slot] = getCommonSubClass(OldRC, RC);
}
return I->second;
}
/// print - Implement the dump method.
void LiveStacks::print(raw_ostream &OS, const Module*) const {