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.
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