[llvm-commits] [llvm] r46586 - /llvm/trunk/lib/CodeGen/PrologEpilogInserter.cpp

[Evan Cheng]

Author: evancheng
Date: Wed Jan 30 18:27:49 2008
New Revision: 46586

URL: http://llvm.org/viewvc/llvm-project?rev=46586&view=rev
Log:
Also avoid adding callee save code before debug labels.

Modified:
    llvm/trunk/lib/CodeGen/PrologEpilogInserter.cpp

Modified: llvm/trunk/lib/CodeGen/PrologEpilogInserter.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/PrologEpilogInserter.cpp?rev=46586&r1=46585&r2=46586&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/PrologEpilogInserter.cpp (original)
+++ llvm/trunk/lib/CodeGen/PrologEpilogInserter.cpp Wed Jan 30 18:27:49 2008
@@ -243,11 +243,19 @@
     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.