Implement LiveRangeCalc::extendToUses() and createDeadDefs().
These LiveRangeCalc methods are to be used when computing a live range
from scratch.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158027 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveInterval.cpp b/lib/CodeGen/LiveInterval.cpp
index 010ef48..68bb639 100644
--- a/lib/CodeGen/LiveInterval.cpp
+++ b/lib/CodeGen/LiveInterval.cpp
@@ -48,6 +48,26 @@
return I;
}
+VNInfo *LiveInterval::createDeadDef(SlotIndex Def,
+ VNInfo::Allocator &VNInfoAllocator) {
+ assert(!Def.isDead() && "Cannot define a value at the dead slot");
+ iterator I = find(Def);
+ if (I == end()) {
+ VNInfo *VNI = getNextValue(Def, VNInfoAllocator);
+ ranges.push_back(LiveRange(Def, Def.getDeadSlot(), VNI));
+ return VNI;
+ }
+ if (SlotIndex::isSameInstr(Def, I->start)) {
+ assert(I->start == Def && "Cannot insert def, already live");
+ assert(I->valno->def == Def && "Inconsistent existing value def");
+ return I->valno;
+ }
+ assert(SlotIndex::isEarlierInstr(Def, I->start) && "Already live at def");
+ VNInfo *VNI = getNextValue(Def, VNInfoAllocator);
+ ranges.insert(I, LiveRange(Def, Def.getDeadSlot(), VNI));
+ return VNI;
+}
+
/// killedInRange - Return true if the interval has kills in [Start,End).
bool LiveInterval::killedInRange(SlotIndex Start, SlotIndex End) const {
Ranges::const_iterator r =