commit b5262d6d8f53debae1e1c9de9486e719594cebcf
author Nico Rieck <nico.rieck@gmail.com> Sun Jan 12 14:09:17 2014 +0000
committer Nico Rieck <nico.rieck@gmail.com> Sun Jan 12 14:09:17 2014 +0000
tree b90834b2fa3ef2b94923fec8f8c9acb727532023
parent 52eef8876ed3ce28ae762206c046c0aa76d39a12

Fix non-deterministic SDNodeOrder-dependent codegen

Reset SelectionDAGBuilder's SDNodeOrder to ensure deterministic code
generation.

llvm-svn: 199050

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
index d67c846..d32d13f 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
@@ -488,6 +488,10 @@
 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 @@
 
   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) {
   }