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Correctly add chain dependencies around calls and unknown-side-effect instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86080 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -367,6 +367,7 @@ void ScheduleDAGInstrs::BuildSchedGraph(AliasAnalysis *AA) {
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for (unsigned i = 0, e = I->second.size(); i != e; ++i)
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I->second[i]->addPred(SDep(SU, SDep::Order, TrueMemOrderLatency));
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I->second.clear();
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I->second.push_back(SU);
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}
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// See if it is known to just have a single memory reference.
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MachineInstr *ChainMI = Chain->getInstr();
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@ -413,7 +414,7 @@ void ScheduleDAGInstrs::BuildSchedGraph(AliasAnalysis *AA) {
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if (Chain)
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Chain->addPred(SDep(SU, SDep::Order, /*Latency=*/0));
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}
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} else if (MayAlias) {
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} else {
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// Treat all other stores conservatively.
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goto new_chain;
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}
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@ -439,7 +440,7 @@ void ScheduleDAGInstrs::BuildSchedGraph(AliasAnalysis *AA) {
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// Treat volatile loads conservatively. Note that this includes
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// cases where memoperand information is unavailable.
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goto new_chain;
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} else if (MayAlias) {
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} else {
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// A "MayAlias" load. Depend on the general chain, as well as on
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// all stores. In the absense of MachineMemOperand information,
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// we can't even assume that the load doesn't alias well-behaved
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