Also avoid adding callee save code before debug labels.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46586 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/PrologEpilogInserter.cpp b/lib/CodeGen/PrologEpilogInserter.cpp
index 0280318bb7e1df73e0f5ca27f5518f552779e67b..c990ba4776fda0073bc6b1b218435afffe413041 100644 (file)
--- a/lib/CodeGen/PrologEpilogInserter.cpp
+++ b/lib/CodeGen/PrologEpilogInserter.cpp
@@ -243,11 +243,19 @@ void PEI::saveCalleeSavedRegisters(MachineFunction &Fn) {
     return;
 
   const TargetInstrInfo &TII = *Fn.getTarget().getInstrInfo();
-  
+
   // Now that we have a stack slot for each register to be saved, insert spill
   // code into the entry block.
   MachineBasicBlock *MBB = Fn.begin();
   MachineBasicBlock::iterator I = MBB->begin();
+
+  // Do not insert prologue code before debug LABELs at the start of the
+  // entry block.
+  MachineModuleInfo *MMI = FFI->getMachineModuleInfo();
+  if (MMI && MMI->hasDebugInfo())
+    while (I != MBB->end() && I->getOpcode() == TargetInstrInfo::LABEL)
+      ++I;
+
   if (!TII.spillCalleeSavedRegisters(*MBB, I, CSI)) {
     for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
       // Add the callee-saved register as live-in. It's killed at the spill.