PPC64: [turbofan] Change TruncateFloat64ToUint64 to TryTruncateFloatToUint64.

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

Index: src/compiler/ppc/instruction-selector-ppc.cc
diff --git a/src/compiler/ppc/instruction-selector-ppc.cc b/src/compiler/ppc/instruction-selector-ppc.cc
index da9ce5fc5dccbaf26898afda8883448c88f7d378..2f18ed202f52226c4965198172f46e8825165fec 100644
--- a/src/compiler/ppc/instruction-selector-ppc.cc
+++ b/src/compiler/ppc/instruction-selector-ppc.cc
@@ -947,11 +947,19 @@ void InstructionSelector::VisitTruncateFloat32ToUint64(Node* node) {
 
 
 void InstructionSelector::VisitTryTruncateFloat64ToUint64(Node* node) {
-  if (NodeProperties::FindProjection(node, 1)) {
-    // TODO(ppc): implement the second return value.
-    UNIMPLEMENTED();
+  PPCOperandGenerator g(this);
+
+  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);
   }
-  VisitRR(this, kPPC_DoubleToUint64, node);
+
+  Emit(kPPC_DoubleToUint64, output_count, outputs, 1, inputs);
 }