From: David Goodwin <david_goodwin@apple.com>
Date: Thu, 5 Nov 2009 00:16:44 +0000 (+0000)
Subject: Correctly add chain dependencies around calls and unknown-side-effect instructions.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5be870add97c52862285eddaf950c806a3fa076b;p=oota-llvm.git

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
---

diff --git a/lib/CodeGen/ScheduleDAGInstrs.cpp b/lib/CodeGen/ScheduleDAGInstrs.cpp
index 6070ff6ed19..f8b219d6413 100644
--- a/lib/CodeGen/ScheduleDAGInstrs.cpp
+++ b/lib/CodeGen/ScheduleDAGInstrs.cpp
@@ -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