Fixes to r153903. Added missing explanation of behaviour when the VirtRegMap is NULL. Also changed it in this case to just avoid updating the map, but live ranges or intervals will still get updated and created
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153914 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveRangeEdit.cpp b/lib/CodeGen/LiveRangeEdit.cpp
index 52e366c..4ecb2d9 100644
--- a/lib/CodeGen/LiveRangeEdit.cpp
+++ b/lib/CodeGen/LiveRangeEdit.cpp
@@ -33,8 +33,10 @@
LiveInterval &LiveRangeEdit::createFrom(unsigned OldReg) {
unsigned VReg = MRI.createVirtualRegister(MRI.getRegClass(OldReg));
- VRM->grow();
- VRM->setIsSplitFromReg(VReg, VRM->getOriginal(OldReg));
+ if (VRM) {
+ VRM->grow();
+ VRM->setIsSplitFromReg(VReg, VRM->getOriginal(OldReg));
+ }
LiveInterval &LI = LIS.getOrCreateInterval(VReg);
newRegs_.push_back(&LI);
return LI;
@@ -270,8 +272,6 @@
delegate_->LRE_WillShrinkVirtReg(LI->reg);
if (!LIS.shrinkToUses(LI, &Dead))
continue;
- if (!VRM)
- continue;
// Don't create new intervals for a register being spilled.
// The new intervals would have to be spilled anyway so its not worth it.
@@ -295,7 +295,7 @@
if (NumComp <= 1)
continue;
++NumFracRanges;
- bool IsOriginal = VRM->getOriginal(LI->reg) == LI->reg;
+ bool IsOriginal = VRM && VRM->getOriginal(LI->reg) == LI->reg;
DEBUG(dbgs() << NumComp << " components: " << *LI << '\n');
SmallVector<LiveInterval*, 8> Dups(1, LI);
for (unsigned i = 1; i != NumComp; ++i) {