Duplicated node may produce a non-physical register def.

llvm-svn: 62015

3 files changed, 47 insertions, 4 deletions

diff --git a/llvm/include/llvm/CodeGen/ScheduleDAGSDNodes.h b/llvm/include/llvm/CodeGen/ScheduleDAGSDNodes.h
index 2c3f0974c0d..65d96a9a8a5 100644
--- a/llvm/include/llvm/CodeGen/ScheduleDAGSDNodes.h
+++ b/llvm/include/llvm/CodeGen/ScheduleDAGSDNodes.h
@@ -188,7 +188,7 @@ namespace llvm {
                          DenseMap<SDValue, unsigned> &VRBaseMap);
     
     void CreateVirtualRegisters(SDNode *Node, MachineInstr *MI,
-                                const TargetInstrDesc &II,
+                                const TargetInstrDesc &II, bool IsClone,
                                 DenseMap<SDValue, unsigned> &VRBaseMap);
 
     /// BuildSchedUnits, AddSchedEdges - Helper functions for BuildSchedGraph.
diff --git a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodesEmit.cpp b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodesEmit.cpp
index 4019ec1303f..ebe084d811f 100644
--- a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodesEmit.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodesEmit.cpp
@@ -157,8 +157,8 @@ unsigned ScheduleDAGSDNodes::getDstOfOnlyCopyToRegUse(SDNode *Node,
 }
 
 void ScheduleDAGSDNodes::CreateVirtualRegisters(SDNode *Node, MachineInstr *MI,
-                                 const TargetInstrDesc &II,
-                                 DenseMap<SDValue, unsigned> &VRBaseMap) {
+                                       const TargetInstrDesc &II, bool IsClone,
+                                       DenseMap<SDValue, unsigned> &VRBaseMap) {
   assert(Node->getMachineOpcode() != TargetInstrInfo::IMPLICIT_DEF &&
          "IMPLICIT_DEF should have been handled as a special case elsewhere!");
 
@@ -192,6 +192,8 @@ void ScheduleDAGSDNodes::CreateVirtualRegisters(SDNode *Node, MachineInstr *MI,
     }
 
     SDValue Op(Node, i);
+    if (IsClone)
+      VRBaseMap.erase(Op);
     bool isNew = VRBaseMap.insert(std::make_pair(Op, VRBase)).second;
     isNew = isNew; // Silence compiler warning.
     assert(isNew && "Node emitted out of order - early");
@@ -487,7 +489,7 @@ void ScheduleDAGSDNodes::EmitNode(SDNode *Node, bool IsClone,
     // Add result register values for things that are defined by this
     // instruction.
     if (NumResults)
-      CreateVirtualRegisters(Node, MI, II, VRBaseMap);
+      CreateVirtualRegisters(Node, MI, II, IsClone, VRBaseMap);
     
     // Emit all of the actual operands of this instruction, adding them to the
     // instruction as appropriate.
diff --git a/llvm/test/CodeGen/X86/2009-01-09-SchedDupBug.ll b/llvm/test/CodeGen/X86/2009-01-09-SchedDupBug.ll
new file mode 100644
index 00000000000..d86eb687e98
--- /dev/null
+++ b/llvm/test/CodeGen/X86/2009-01-09-SchedDupBug.ll
@@ -0,0 +1,41 @@
+; RUN: llvm-as < %s | llc -march=x86 -mattr=+sse2
+; rdar://6481994
+
+	%Value = type { i32 (...)** }
+
+declare { i32, i1 } @llvm.sadd.with.overflow.i32(i32, i32) nounwind
+
+define %Value* @bar(%Value** %exception) nounwind {
+prologue:
+	br i1 true, label %NextVerify41, label %FailedVerify
+
+NextVerify41:		; preds = %prologue
+	br i1 true, label %NextVerify, label %FailedVerify
+
+NextVerify:		; preds = %NextVerify41
+	br i1 false, label %label12, label %label
+
+label:		; preds = %NextVerify
+	br i1 true, label %xxNumberLiteral.exit, label %handle_exception
+
+xxNumberLiteral.exit:		; preds = %label
+	%0 = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 0, i32 0)		; <{ i32, i1 }> [#uses=2]
+	%intAdd = extractvalue { i32, i1 } %0, 0		; <i32> [#uses=1]
+	%intAddOverflow = extractvalue { i32, i1 } %0, 1		; <i1> [#uses=1]
+	%toint55 = ashr i32 %intAdd, 1		; <i32> [#uses=1]
+	%toFP56 = sitofp i32 %toint55 to double		; <double> [#uses=1]
+	br i1 %intAddOverflow, label %exit, label %label12
+
+label12:		; preds = %xxNumberLiteral.exit, %NextVerify
+	%var_lr1.0 = phi double [ %toFP56, %xxNumberLiteral.exit ], [ 0.000000e+00, %NextVerify ]		; <double> [#uses=0]
+	unreachable
+
+exit:		; preds = %xxNumberLiteral.exit
+	ret %Value* null
+
+FailedVerify:		; preds = %NextVerify41, %prologue
+	ret %Value* null
+
+handle_exception:		; preds = %label
+	ret %Value* undef
+}