Do not add livein's to entry MBB twice.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34382 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/RegAllocLinearScan.cpp b/lib/CodeGen/RegAllocLinearScan.cpp
index bd44e81244e235a2e509a890617a47d27b0e9f17..3a1bfc25fe87a90a6eb977ec7b05d9fd5826637d 100644 (file)
--- a/lib/CodeGen/RegAllocLinearScan.cpp
+++ b/lib/CodeGen/RegAllocLinearScan.cpp
@@ -292,8 +292,9 @@ void RA::linearScan()
   }
 
   // A brute force way of adding live-ins to every BB.
-  for (MachineFunction::iterator MBB = mf_->begin(), E = mf_->end();
-       MBB != E; ++MBB) {
+  MachineFunction::iterator MBB = mf_->begin();
+  ++MBB; // Skip entry MBB.
+  for (MachineFunction::iterator E = mf_->end(); MBB != E; ++MBB) {
     unsigned StartIdx = li_->getMBBStartIdx(MBB->getNumber());
     for (IntervalPtrs::iterator i = fixed_.begin(), e = fixed_.end();
          i != e; ++i)