From ae692f2baedf53504af2715993b166950e185a55 Mon Sep 17 00:00:00 2001
From: Andrew Trick <atrick@apple.com>
Date: Mon, 12 Nov 2012 19:28:57 +0000
Subject: misched: Infrastructure for weak DAG edges.

This adds support for weak DAG edges to the general scheduling
infrastructure in preparation for MachineScheduler support for
heuristics based on weak edges.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167738 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/ScheduleDAGVLIW.cpp | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'lib/CodeGen/SelectionDAG/ScheduleDAGVLIW.cpp')

diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGVLIW.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGVLIW.cpp
index 30f03ac..f8ca7b1 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGVLIW.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGVLIW.cpp
@@ -123,6 +123,8 @@ void ScheduleDAGVLIW::releaseSucc(SUnit *SU, const SDep &D) {
     llvm_unreachable(0);
   }
 #endif
+  assert(!D.isWeak() && "unexpected artificial DAG edge");
+
   --SuccSU->NumPredsLeft;
 
   SuccSU->setDepthToAtLeast(SU->getDepth() + D.getLatency());
-- 
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