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Also avoid adding callee save code before debug labels.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46586 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-01-31 00:27:49 +00:00
parent c6c391dadd
commit 00dff8dda2
1 changed files with 9 additions and 1 deletions
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10
lib/CodeGen/PrologEpilogInserter.cpp
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@ -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.