Teach TargetRegisterInfo how to cram stack slot indexes in with the virtual and
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
diff --git a/lib/CodeGen/LiveStackAnalysis.cpp b/lib/CodeGen/LiveStackAnalysis.cpp
index 895bd2e..c75196a 100644
--- a/lib/CodeGen/LiveStackAnalysis.cpp
+++ b/lib/CodeGen/LiveStackAnalysis.cpp
@@ -50,6 +50,22 @@
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 {