[Atomics] Make Atomics.compareExchange a builtin using TF

src/compiler/ia32/instruction-selector-ia32.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 1738 matching lines @@
     addressing_mode = kMode_MRI;
   } else {
     inputs[input_count++] = g.UseUniqueRegister(index);
     addressing_mode = kMode_MR1;
   }
   outputs[0] = g.DefineSameAsFirst(node);
   InstructionCode code = opcode | AddressingModeField::encode(addressing_mode);
   Emit(code, 1, outputs, input_count, inputs);
 }
 
+void InstructionSelector::VisitAtomicCompareExchange(Node* node) {
+  IA32OperandGenerator g(this);
+  Node* base = node->InputAt(0);
+  Node* index = node->InputAt(1);
+  Node* old_value = node->InputAt(2);
+  Node* new_value = node->InputAt(3);
+
+  MachineType type = AtomicCompareExchangeRepresentationOf(node->op());
+  ArchOpcode opcode = kArchNop;
+  if (type == MachineType::Int8()) {
+    opcode = kAtomicCompareExchangeInt8;
+  } else if (type == MachineType::Uint8()) {
+    opcode = kAtomicCompareExchangeUint8;
+  } else if (type == MachineType::Int16()) {
+    opcode = kAtomicCompareExchangeInt16;
+  } else if (type == MachineType::Uint16()) {
+    opcode = kAtomicCompareExchangeUint16;
+  } else if (type == MachineType::Int32() || type == MachineType::Uint32()) {
+    opcode = kAtomicCompareExchangeWord32;
+  } else {
+    UNREACHABLE();
+    return;
+  }
+  InstructionOperand outputs[1];
+  AddressingMode addressing_mode;
+  InstructionOperand inputs[4];
+  size_t input_count = 0;
+  inputs[input_count++] = g.UseFixed(old_value, eax);
+  inputs[input_count++] = g.UseUniqueRegister(new_value);
+  inputs[input_count++] = g.UseUniqueRegister(base);
+  if (g.CanBeImmediate(index)) {
+    inputs[input_count++] = g.UseImmediate(index);
+    addressing_mode = kMode_MRI;
+  } else {
+    inputs[input_count++] = g.UseUniqueRegister(index);
+    addressing_mode = kMode_MR1;
+  }
+  outputs[0] = g.DefineAsFixed(node, eax);
+  InstructionCode code = opcode | AddressingModeField::encode(addressing_mode);
+  Emit(code, 1, outputs, input_count, inputs);
+}
+
 // static
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {
   MachineOperatorBuilder::Flags flags =
       MachineOperatorBuilder::kWord32ShiftIsSafe |
       MachineOperatorBuilder::kWord32Ctz;
   if (CpuFeatures::IsSupported(POPCNT)) {
     flags |= MachineOperatorBuilder::kWord32Popcnt;
   }
   if (CpuFeatures::IsSupported(SSE4_1)) {
@@ skipping 12 matching lines @@
 // static
 MachineOperatorBuilder::AlignmentRequirements
 InstructionSelector::AlignmentRequirements() {
   return MachineOperatorBuilder::AlignmentRequirements::
       FullUnalignedAccessSupport();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8