X87: [turbofan] Enable tail calls for %_CallRuntime.

src/compiler/x87/instruction-selector-x87.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
 namespace v8 {
@@ skipping 872 matching lines @@
 
 
 void InstructionSelector::VisitTailCall(Node* node) {
   X87OperandGenerator g(this);
   CallDescriptor const* descriptor = OpParameter<CallDescriptor const*>(node);
   DCHECK_NE(0, descriptor->flags() & CallDescriptor::kSupportsTailCalls);
   DCHECK_EQ(0, descriptor->flags() & CallDescriptor::kPatchableCallSite);
   DCHECK_EQ(0, descriptor->flags() & CallDescriptor::kNeedsNopAfterCall);
 
   // TODO(turbofan): Relax restriction for stack parameters.
-  if (descriptor->UsesOnlyRegisters() &&
-      descriptor->HasSameReturnLocationsAs(
-          linkage()->GetIncomingDescriptor())) {
+
+  if (linkage()->GetIncomingDescriptor()->CanTailCall(node)) {
     CallBuffer buffer(zone(), descriptor, nullptr);
 
     // Compute InstructionOperands for inputs and outputs.
     InitializeCallBuffer(node, &buffer, true, true);
 
-    DCHECK_EQ(0u, buffer.pushed_nodes.size());
-
     // Select the appropriate opcode based on the call type.
     InstructionCode opcode;
     switch (descriptor->kind()) {
       case CallDescriptor::kCallCodeObject:
         opcode = kArchTailCallCodeObject;
         break;
       case CallDescriptor::kCallJSFunction:
         opcode = kArchTailCallJSFunction;
         break;
       default:
@@ skipping 419 matching lines @@
       MachineOperatorBuilder::kFloat32Min |
       MachineOperatorBuilder::kFloat64Max |
       MachineOperatorBuilder::kFloat64Min |
       MachineOperatorBuilder::kWord32ShiftIsSafe;
   return flags;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8