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Fix a bug introduced with my previous patch, where it didn't correctly handle

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instructions which replace themselves when FI's are rewritten (common on ppc).
This fixes CodeGen/PowerPC/2006-10-17-ppc64-alloca.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35789 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-04-09 01:19:33 +00:00
parent 599ded1a7f
commit 0ebe9c132c
1 changed files with 9 additions and 7 deletions
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16
lib/CodeGen/PrologEpilogInserter.cpp
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@ -498,20 +498,22 @@ void PEI::replaceFrameIndices(MachineFunction &Fn) {
for (MachineFunction::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) {
if (RS) RS->enterBasicBlock(BB);
for (MachineBasicBlock::iterator I = BB->begin(); I != BB->end(); ++I) {
for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
if (I->getOperand(i).isFrameIndex()) {
for (MachineBasicBlock::iterator I = BB->begin(); I != BB->end(); ) {
MachineInstr *MI = I++;
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i)
if (MI->getOperand(i).isFrameIndex()) {
// If this instruction has a FrameIndex operand, we need to use that
// target machine register info object to eliminate it.
MRI.eliminateFrameIndex(I, RS);
MRI.eliminateFrameIndex(MI, RS);
// Revisit the instruction in full. Some instructions (e.g. inline
// asm instructions) can have multiple frame indices.
e = I->getNumOperands();
i = -1U;
--I;
MI = 0;
break;
}
// Update register states.
if (RS) RS->forward(I);
if (RS && MI) RS->forward(MI);
}
}
}