Use VirtRegMap's Virt2SplitMap to keep track of the original live range before splitting.
All new virtual registers created for spilling or splitting point back to their original.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125980 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveRangeEdit.cpp b/lib/CodeGen/LiveRangeEdit.cpp
index 3c7d9f6..e23f382 100644
--- a/lib/CodeGen/LiveRangeEdit.cpp
+++ b/lib/CodeGen/LiveRangeEdit.cpp
@@ -19,12 +19,18 @@
using namespace llvm;
+unsigned LiveRangeEdit::getOriginal(const VirtRegMap &vrm) const {
+ unsigned Orig = vrm.getPreSplitReg(getReg());
+ return Orig ? Orig : getReg();
+}
+
LiveInterval &LiveRangeEdit::create(MachineRegisterInfo &mri,
LiveIntervals &lis,
VirtRegMap &vrm) {
- const TargetRegisterClass *RC = mri.getRegClass(parent_.reg);
+ const TargetRegisterClass *RC = mri.getRegClass(getReg());
unsigned VReg = mri.createVirtualRegister(RC);
vrm.grow();
+ vrm.setIsSplitFromReg(VReg, getOriginal(vrm));
LiveInterval &li = lis.getOrCreateInterval(VReg);
newRegs_.push_back(&li);
return li;