S390: [Atomics] Make Atomics.store a builtin using TF

Port 81cb8411

R=binji@chromium.org, joransiu@ca.ibm.com, bjaideep@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=v8:4614
LOG=N

Review-Url: https://codereview.chromium.org/1948043002
Cr-Commit-Position: refs/heads/master@{#36039}

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

@@ -1658,6 +1658,15 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
     case kAtomicLoadWord32:
       __ LoadlW(i.OutputRegister(), i.MemoryOperand());
       break;
+    case kAtomicStoreWord8:
+      __ StoreByte(i.InputRegister(0), i.MemoryOperand(NULL, 1));
+      break;
+    case kAtomicStoreWord16:
+      __ StoreHalfWord(i.InputRegister(0), i.MemoryOperand(NULL, 1));
+      break;
+    case kAtomicStoreWord32:
+      __ StoreW(i.InputRegister(0), i.MemoryOperand(NULL, 1));
+      break;
     default:
       UNREACHABLE();
       break;

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

@@ -1768,6 +1768,37 @@ void InstructionSelector::VisitAtomicLoad(Node* node) {
        g.DefineAsRegister(node), g.UseRegister(base), g.UseRegister(index));
 }
 
+void InstructionSelector::VisitAtomicStore(Node* node) {
+  MachineRepresentation rep = AtomicStoreRepresentationOf(node->op());
+  S390OperandGenerator g(this);
+  Node* base = node->InputAt(0);
+  Node* index = node->InputAt(1);
+  Node* value = node->InputAt(2);
+  ArchOpcode opcode = kArchNop;
+  switch (rep) {
+    case MachineRepresentation::kWord8:
+      opcode = kAtomicStoreWord8;
+      break;
+    case MachineRepresentation::kWord16:
+      opcode = kAtomicStoreWord16;
+      break;
+    case MachineRepresentation::kWord32:
+      opcode = kAtomicStoreWord32;
+      break;
+    default:
+      UNREACHABLE();
+      return;
+  }
+
+  InstructionOperand inputs[4];
+  size_t input_count = 0;
+  inputs[input_count++] = g.UseUniqueRegister(value);
+  inputs[input_count++] = g.UseUniqueRegister(base);
+  inputs[input_count++] = g.UseUniqueRegister(index);
+  Emit(opcode | AddressingModeField::encode(kMode_MRR), 0, nullptr, input_count,
+       inputs);
+}
+
 // static
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {