If a split live interval is spilled again, remove the kill marker on its last use.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44611 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/VirtRegMap.h b/lib/CodeGen/VirtRegMap.h
index df32a65..7740740 100644
--- a/lib/CodeGen/VirtRegMap.h
+++ b/lib/CodeGen/VirtRegMap.h
@@ -66,6 +66,10 @@
/// mapping.
IndexedMap<unsigned, VirtReg2IndexFunctor> Virt2SplitMap;
+ /// Virt2SplitKillMap - This is splitted virtual register to its last use
+ /// (kill) mapping.
+ IndexedMap<MachineOperand*> Virt2SplitKillMap;
+
/// ReMatMap - This is virtual register to re-materialized instruction
/// mapping. Each virtual register whose definition is going to be
/// re-materialized has an entry in it.
@@ -210,6 +214,21 @@
ReMatMap[virtReg] = def;
}
+ /// @brief record the last use (kill) of a split virtual register.
+ void addKillPoint(unsigned virtReg, MachineOperand *Op) {
+ Virt2SplitKillMap[virtReg] = Op;
+ }
+
+ /// @brief reset and remove the last use (kill) of a split virtual register.
+ void removeKillPoint(unsigned virtReg) {
+ MachineOperand *MO = Virt2SplitKillMap[virtReg];
+ if (MO) {
+ assert(MO->isKill() && "Split last use is not marked kill?");
+ MO->unsetIsKill();
+ Virt2SplitKillMap[virtReg] = NULL;
+ }
+ }
+
/// @brief returns true if the specified MachineInstr is a spill point.
bool isSpillPt(MachineInstr *Pt) const {
return SpillPt2VirtMap.find(Pt) != SpillPt2VirtMap.end();