This method belonged in VirtRegMap.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126002 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/VirtRegMap.h b/lib/CodeGen/VirtRegMap.h
index 23101ce..ba50f4e 100644
--- a/lib/CodeGen/VirtRegMap.h
+++ b/lib/CodeGen/VirtRegMap.h
@@ -218,6 +218,15 @@
return Virt2SplitMap[virtReg];
}
+ /// getOriginal - Return the original virtual register that VirtReg descends
+ /// from through splitting.
+ /// A register that was not created by splitting is its own original.
+ /// This operation is idempotent.
+ unsigned getOriginal(unsigned VirtReg) const {
+ unsigned Orig = getPreSplitReg(VirtReg);
+ return Orig ? Orig : VirtReg;
+ }
+
/// @brief returns true if the specified virtual register is not
/// mapped to a stack slot or rematerialized.
bool isAssignedReg(unsigned virtReg) const {