FastISel can only apend to basic blocks.

Compute the insertion point from the end of the basic block instead of
skipping labels from the front.

This caused failures in landing pads when live-in copies where inserted
before instruction selection.

llvm-svn: 185616

1 files changed, 5 insertions, 8 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
index aa1686fb7d5..e039be759c4 100644
--- a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -76,15 +76,12 @@ STATISTIC(NumFastIselDead, "Number of dead insts removed on failure");
 void FastISel::startNewBlock() {
   LocalValueMap.clear();
 
+  // Instructions are append to FuncInfo.MBB. If the basic block already
+  // contains labels or copies, use the last instruction as the last local
+  // value.
   EmitStartPt = 0;
-
-  // Advance the emit start point past any EH_LABEL instructions.
-  MachineBasicBlock::iterator
-    I = FuncInfo.MBB->begin(), E = FuncInfo.MBB->end();
-  while (I != E && I->getOpcode() == TargetOpcode::EH_LABEL) {
-    EmitStartPt = I;
-    ++I;
-  }
+  if (!FuncInfo.MBB->empty())
+    EmitStartPt = &FuncInfo.MBB->back();
   LastLocalValue = EmitStartPt;
 }