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.
llvm-svn: 125980
diff --git a/llvm/lib/CodeGen/VirtRegMap.h b/llvm/lib/CodeGen/VirtRegMap.h
index a43ac5f..23101ce 100644
--- a/llvm/lib/CodeGen/VirtRegMap.h
+++ b/llvm/lib/CodeGen/VirtRegMap.h
@@ -214,7 +214,7 @@
}
/// @brief returns the live interval virtReg is split from.
- unsigned getPreSplitReg(unsigned virtReg) {
+ unsigned getPreSplitReg(unsigned virtReg) const {
return Virt2SplitMap[virtReg];
}