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Fix PEI to not walk off the start of a block when an updated instruction

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is the first in its block.  This is PR3842.

llvm-svn: 67304
This commit is contained in:
Chris Lattner 2009-03-19 17:15:43 +00:00
parent 45d4adde66
commit 3181caa065
1 changed files with 6 additions and 2 deletions
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8
lib/CodeGen/PrologEpilogInserter.cpp
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@ -533,11 +533,15 @@ void PEI::replaceFrameIndices(MachineFunction &Fn) {
SPAdj += Size;
MachineBasicBlock::iterator PrevI = prior(I);
MachineBasicBlock::iterator PrevI = BB->end();
if (I != BB->begin()) PrevI = prior(I);
TRI.eliminateCallFramePseudoInstr(Fn, *BB, I);
// Visit the instructions created by eliminateCallFramePseudoInstr().
I = next(PrevI);
if (PrevI == BB->end())
I = BB->begin(); // The replaced instr was the first in the block.
else
I = next(PrevI);
continue;
}