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Correctly add chain dependencies around calls and unknown-side-effect instructions.

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llvm-svn: 86080
This commit is contained in:
David Goodwin 2009-11-05 00:16:44 +00:00
parent 21ec158c23
commit 442fe1bbf8
1 changed files with 3 additions and 2 deletions
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5
lib/CodeGen/ScheduleDAGInstrs.cpp
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@ -367,6 +367,7 @@ void ScheduleDAGInstrs::BuildSchedGraph(AliasAnalysis *AA) {
for (unsigned i = 0, e = I->second.size(); i != e; ++i)
I->second[i]->addPred(SDep(SU, SDep::Order, TrueMemOrderLatency));
I->second.clear();
I->second.push_back(SU);
}
// See if it is known to just have a single memory reference.
MachineInstr *ChainMI = Chain->getInstr();
@ -413,7 +414,7 @@ void ScheduleDAGInstrs::BuildSchedGraph(AliasAnalysis *AA) {
if (Chain)
Chain->addPred(SDep(SU, SDep::Order, /*Latency=*/0));
}
} else if (MayAlias) {
} else {
// Treat all other stores conservatively.
goto new_chain;
}
@ -439,7 +440,7 @@ void ScheduleDAGInstrs::BuildSchedGraph(AliasAnalysis *AA) {
// Treat volatile loads conservatively. Note that this includes
// cases where memoperand information is unavailable.
goto new_chain;
} else if (MayAlias) {
} else {
// A "MayAlias" load. Depend on the general chain, as well as on
// all stores. In the absense of MachineMemOperand information,
// we can't even assume that the load doesn't alias well-behaved