Rename registers to break output dependencies in addition to anti-dependencies.

llvm-svn: 87015

1 files changed, 12 insertions, 3 deletions

diff --git a/llvm/lib/CodeGen/LatencyPriorityQueue.cpp b/llvm/lib/CodeGen/LatencyPriorityQueue.cpp
index 794ecf7bd19..23dce4a91a1 100644
--- a/llvm/lib/CodeGen/LatencyPriorityQueue.cpp
+++ b/llvm/lib/CodeGen/LatencyPriorityQueue.cpp
@@ -55,7 +55,10 @@ SUnit *LatencyPriorityQueue::getSingleUnscheduledPred(SUnit *SU) {
   SUnit *OnlyAvailablePred = 0;
   for (SUnit::const_pred_iterator I = SU->Preds.begin(), E = SU->Preds.end();
        I != E; ++I) {
-    if (IgnoreAntiDep && (I->getKind() == SDep::Anti)) continue;
+    if (IgnoreAntiDep && 
+        ((I->getKind() == SDep::Anti) || (I->getKind() == SDep::Output))) 
+      continue;
+
     SUnit &Pred = *I->getSUnit();
     if (!Pred.isScheduled) {
       // We found an available, but not scheduled, predecessor.  If it's the
@@ -75,7 +78,10 @@ void LatencyPriorityQueue::push_impl(SUnit *SU) {
   unsigned NumNodesBlocking = 0;
   for (SUnit::const_succ_iterator I = SU->Succs.begin(), E = SU->Succs.end();
        I != E; ++I) {
-    if (IgnoreAntiDep && (I->getKind() == SDep::Anti)) continue;
+    if (IgnoreAntiDep && 
+        ((I->getKind() == SDep::Anti) || (I->getKind() == SDep::Output))) 
+      continue;
+
     if (getSingleUnscheduledPred(I->getSUnit()) == SU)
       ++NumNodesBlocking;
   }
@@ -92,7 +98,10 @@ void LatencyPriorityQueue::push_impl(SUnit *SU) {
 void LatencyPriorityQueue::ScheduledNode(SUnit *SU) {
   for (SUnit::const_succ_iterator I = SU->Succs.begin(), E = SU->Succs.end();
        I != E; ++I) {
-    if (IgnoreAntiDep && (I->getKind() == SDep::Anti)) continue;
+    if (IgnoreAntiDep && 
+        ((I->getKind() == SDep::Anti) || (I->getKind() == SDep::Output))) 
+      continue;
+
     AdjustPriorityOfUnscheduledPreds(I->getSUnit());
   }
 }