Teach frame lowering to ignore debug values after the terminators.

llvm-svn: 123399

1 files changed, 12 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/MachineBasicBlock.cpp b/llvm/lib/CodeGen/MachineBasicBlock.cpp
index 813fad288e8..ad1ab287e34 100644
--- a/llvm/lib/CodeGen/MachineBasicBlock.cpp
+++ b/llvm/lib/CodeGen/MachineBasicBlock.cpp
@@ -162,6 +162,18 @@ MachineBasicBlock::iterator MachineBasicBlock::getFirstTerminator() {
   return I;
 }
 
+MachineBasicBlock::iterator MachineBasicBlock::getLastNonDebugInstr() {
+  iterator B = begin(), I = end();
+  while (I != B) {
+    --I;
+    if (I->isDebugValue())
+      continue;
+    return I;
+  }
+  // The block is all debug values.
+  return end();
+}
+
 void MachineBasicBlock::dump() const {
   print(dbgs());
 }