Fix non-deterministic SDNodeOrder-dependent codegen

Reset SelectionDAGBuilder's SDNodeOrder to ensure deterministic code
generation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199050 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 6 insertions, 1 deletions

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index e40a7c44ad..6c8e2f83a4 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -892,6 +892,7 @@ void SelectionDAGBuilder::clear() {
   PendingExports.clear();
   CurInst = NULL;
   HasTailCall = false;
+  SDNodeOrder = LowestSDNodeOrder;
 }
 
 /// clearDanglingDebugInfo - Clear the dangling debug information
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
index d67c84664e..d32d13f343 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
@@ -488,6 +488,10 @@ private:
 private:
   const TargetMachine &TM;
 public:
+  /// Lowest valid SDNodeOrder. The special case 0 is reserved for scheduling
+  /// nodes without a corresponding SDNode.
+  static const unsigned LowestSDNodeOrder = 1;
+
   SelectionDAG &DAG;
   const DataLayout *TD;
   AliasAnalysis *AA;
@@ -534,7 +538,7 @@ public:
 
   SelectionDAGBuilder(SelectionDAG &dag, FunctionLoweringInfo &funcinfo,
                       CodeGenOpt::Level ol)
-    : CurInst(NULL), SDNodeOrder(0), TM(dag.getTarget()),
+    : CurInst(NULL), SDNodeOrder(LowestSDNodeOrder), TM(dag.getTarget()),
       DAG(dag), FuncInfo(funcinfo), OptLevel(ol),
       HasTailCall(false) {
   }