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

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 c7eacf51d05f7e23416471d4fda094b6db0080d6..71c78ff0ff474deb0327b49976e7d291cb5effe3 100644
--- a/src/compiler/ppc/instruction-selector-ppc.cc
+++ b/src/compiler/ppc/instruction-selector-ppc.cc
@@ -1938,6 +1938,37 @@ void InstructionSelector::VisitAtomicLoad(Node* node) {
       g.DefineAsRegister(node), g.UseRegister(base), g.UseRegister(index));
 }
 
+void InstructionSelector::VisitAtomicStore(Node* node) {
+  MachineRepresentation rep = AtomicStoreRepresentationOf(node->op());
+  PPCOperandGenerator 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(base);
+  inputs[input_count++] = g.UseUniqueRegister(index);
+  inputs[input_count++] = g.UseUniqueRegister(value);
+  Emit(opcode | AddressingModeField::encode(kMode_MRR),
+      0, nullptr, input_count, inputs);
+}
+
 // static
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {