MIPS: Store transitioned JSArray maps in global context

src/mips/macro-assembler-mips.cc

Index: src/mips/macro-assembler-mips.cc
diff --git a/src/mips/macro-assembler-mips.cc b/src/mips/macro-assembler-mips.cc
index 941c7fe4eac0e9f42a69a89241313b3e1211158e..9eb1fc763948379f10bb4442f55845ef7dab1c76 100644
--- a/src/mips/macro-assembler-mips.cc
+++ b/src/mips/macro-assembler-mips.cc
@@ -4279,6 +4279,31 @@ void MacroAssembler::LoadContext(Register dst, int context_chain_length) {
 }
 
 
+void MacroAssembler::LoadGlobalInitialConstructedArrayMap(
+    Register function_in, Register scratch, Register map_out) {
+  ASSERT(!function_in.is(map_out));
+  Label done;
+  lw(map_out, FieldMemOperand(function_in,
+                              JSFunction::kPrototypeOrInitialMapOffset));
+  if (!FLAG_smi_only_arrays) {
+    // Load the global or builtins object from the current context.
+    lw(scratch, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
+    lw(scratch, FieldMemOperand(scratch, GlobalObject::kGlobalContextOffset));
+
+    // Check that the function's map is same as the cached map.
+    lw(at, MemOperand(
+       scratch, Context::SlotOffset(Context::SMI_JS_ARRAY_MAP_INDEX)));
+    Branch(&done, ne, map_out, Operand(at));
+
+    // Use the cached transitioned map.
+    lw(map_out,
+       MemOperand(scratch,
+                  Context::SlotOffset(Context::OBJECT_JS_ARRAY_MAP_INDEX)));
+  }
+  bind(&done);
+}
+
+
 void MacroAssembler::LoadGlobalFunction(int index, Register function) {
   // Load the global or builtins object from the current context.
   lw(function, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));