[turbofan] Change TruncateFloat64ToUint64 to TryTruncateFloatToUint64.

src/compiler/x64/instruction-selector-x64.cc

Index: src/compiler/x64/instruction-selector-x64.cc
diff --git a/src/compiler/x64/instruction-selector-x64.cc b/src/compiler/x64/instruction-selector-x64.cc
index f649e4d42f3834063ceccb49f512d417ce9ef02c..13dc8943826c64c3dd09079676d0ab5c332064c0 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -862,9 +862,19 @@ void InstructionSelector::VisitTruncateFloat32ToUint64(Node* node) {
 }
 
 
-void InstructionSelector::VisitTruncateFloat64ToUint64(Node* node) {
+void InstructionSelector::VisitTryTruncateFloat64ToUint64(Node* node) {
   X64OperandGenerator g(this);
-  Emit(kSSEFloat64ToUint64, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
+  InstructionOperand inputs[] = {g.UseRegister(node->InputAt(0))};
+  InstructionOperand outputs[2];
+  size_t output_count = 0;
+  outputs[output_count++] = g.DefineAsRegister(node);
+
+  Node* success_output = NodeProperties::FindProjection(node, 1);
+  if (success_output) {
+    outputs[output_count++] = g.DefineAsRegister(success_output);
+  }
+
+  Emit(kSSEFloat64ToUint64, output_count, outputs, 1, inputs);
 }
 
 
@@ -1466,6 +1476,8 @@ void InstructionSelector::VisitBranch(Node* branch, BasicBlock* tbranch,
                 return VisitBinop(this, node, kX64Sub32, &cont);
               case IrOpcode::kTryTruncateFloat64ToInt64:
                 return VisitTryTruncateFloat64ToInt64(result);
+              case IrOpcode::kTryTruncateFloat64ToUint64:

[titzer, 2015/12/09 07:59:03]

I should have caught this earlier. You shouldn't be doing this this way, because
you are probably emitting multiple copies of the code. You should just remove
these cases.

[ahaas, 2015/12/09 10:05:08]

Done.

+                return VisitTryTruncateFloat64ToUint64(result);
               default:
                 break;
             }