PPC/s390: [Atomics] Make Atomics.exchange a builtin using TF

Port 301c1237

R=binji@chromium.org, aseemgarg@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:4614
LOG=N

Review-Url: https://codereview.chromium.org/2733953004
Cr-Commit-Position: refs/heads/master@{#43680}

src/builtins/builtins-sharedarraybuffer.cc

@@ -291,7 +291,8 @@ void Builtins::Generate_AtomicsExchange(compiler::CodeAssemblerState* state) {
 
   Node* value_integer = a.ToInteger(context, value);
 
-#if V8_TARGET_ARCH_MIPS || V8_TARGET_ARCH_MIPS64
+#if V8_TARGET_ARCH_MIPS || V8_TARGET_ARCH_MIPS64 || V8_TARGET_ARCH_PPC64 || \
+    V8_TARGET_ARCH_PPC || V8_TARGET_ARCH_S390 || V8_TARGET_ARCH_S390X
   // Node* index_integer = a.ToInteger(context, index);
   a.Return(a.CallRuntime(Runtime::kAtomicsExchange, context, array,
                          index_integer, value_integer));
@@ -343,7 +344,8 @@ void Builtins::Generate_AtomicsExchange(compiler::CodeAssemblerState* state) {
   // This shouldn't happen, we've already validated the type.
   a.Bind(&other);
   a.Return(a.SmiConstant(0));
-#endif  // V8_TARGET_ARCH_MIPS || V8_TARGET_ARCH_MIPS64
+#endif  // V8_TARGET_ARCH_MIPS || V8_TARGET_ARCH_MIPS64 || V8_TARGET_ARCH_PPC64
+        // || V8_TARGET_ARCH_PPC || V8_TARGET_ARCH_S390 || V8_TARGET_ARCH_S390X
 }
 
 }  // namespace internal

src/compiler/ppc/code-generator-ppc.cc

@@ -1978,6 +1978,13 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
     case kAtomicStoreWord32:
       ASSEMBLE_ATOMIC_STORE_INTEGER(stw, stwx);
       break;
+    case kAtomicExchangeInt8:
+    case kAtomicExchangeUint8:
+    case kAtomicExchangeInt16:
+    case kAtomicExchangeUint16:
+    case kAtomicExchangeWord32:
+      UNREACHABLE();
+      break;
     default:
       UNREACHABLE();
       break;

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

@@ -2113,6 +2113,8 @@ void InstructionSelector::VisitAtomicStore(Node* node) {
       0, nullptr, input_count, inputs);
 }
 
+void InstructionSelector::VisitAtomicExchange(Node* node) { UNIMPLEMENTED(); }
+
 // static
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {

src/compiler/s390/code-generator-s390.cc

@@ -2260,6 +2260,13 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
     case kAtomicStoreWord32:
       __ StoreW(i.InputRegister(0), i.MemoryOperand(NULL, 1));
       break;
+    case kAtomicExchangeInt8:
+    case kAtomicExchangeUint8:
+    case kAtomicExchangeInt16:
+    case kAtomicExchangeUint16:
+    case kAtomicExchangeWord32:
+      UNREACHABLE();
+      break;
     default:
       UNREACHABLE();
       break;

src/compiler/s390/instruction-selector-s390.cc

@@ -2517,6 +2517,8 @@ void InstructionSelector::VisitAtomicStore(Node* node) {
        inputs);
 }
 
+void InstructionSelector::VisitAtomicExchange(Node* node) { UNIMPLEMENTED(); }
+
 // static
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {