Fix a bug in RegAllocBase::addMBBLiveIns() where a basic block could accidentally...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129373 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/RegAllocBasic.cpp b/lib/CodeGen/RegAllocBasic.cpp
index af7da53b89bae0dfd60f13c69471fa61064ce5a7..dd5049898d9d62df2c5a6c9754d650daa91f87bf 100644 (file)
--- a/lib/CodeGen/RegAllocBasic.cpp
+++ b/lib/CodeGen/RegAllocBasic.cpp
@@ -429,7 +429,7 @@ void RegAllocBase::addMBBLiveIns(MachineFunction *MF) {
         if (!MBB->isLiveIn(PhysReg))
           MBB->addLiveIn(PhysReg);
       } else if (SI.start() > Stop)
-        MBB = Indexes->getMBBFromIndex(SI.start());
+        MBB = Indexes->getMBBFromIndex(SI.start().getPrevIndex());
       if (++MBB == MFE)
         break;
       tie(Start, Stop) = Indexes->getMBBRange(MBB);