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Multiple instructions can be inserted when eliminating frame indexes. We need

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the register scavenger to process all of those new instructions instead of just
the last one inserted.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47860 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
2008-03-03 22:11:16 +00:00
parent c2a324fa36
commit 988a5782d3
1 changed files with 24 additions and 7 deletions
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31
lib/CodeGen/PrologEpilogInserter.cpp
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@@ -530,27 +530,44 @@ void PEI::replaceFrameIndices(MachineFunction &Fn) {
// Visit the instructions created by eliminateCallFramePseudoInstr().
I = next(PrevI);
MI = NULL;
} else if (I->getOpcode() == TargetInstrInfo::DECLARE)
} else if (I->getOpcode() == TargetInstrInfo::DECLARE) {
// Ignore it.
I++;
else {
I++;
++I;
} else {
bool DoIncr = true;
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i)
if (MI->getOperand(i).isFrameIndex()) {
// Some instructions (e.g. inline asm instructions) can have
// multiple frame indices and/or cause eliminateFrameIndex to insert
// more than one instruction. We need the register scavenger to go
// through all of these instructions so that it can update its
// register information. We keep the iterator at the point before
// insertion so that we can revisit them in full.
bool AtBeginning = (I == BB->begin());
if (!AtBeginning) --I;
// If this instruction has a FrameIndex operand, we need to use that
// target machine register info object to eliminate it.
TRI.eliminateFrameIndex(MI, SPAdj, RS);
// Revisit the instruction in full. Some instructions (e.g. inline
// asm instructions) can have multiple frame indices.
--I;
// Reset the iterator if we were at the beginning of the BB.
if (AtBeginning) {
I = BB->begin();
DoIncr = false;
}
MI = 0;
break;
}
if (DoIncr) ++I;
}
// Update register states.
if (RS && MI) RS->forward(MI);
}
assert(SPAdj == 0 && "Unbalanced call frame setup / destroy pairs?");
}
}