Implement tracking and optimizations of packed arrays

src/mips/ic-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1329 matching lines @@
                                  &transition_double_elements);
   __ Ret(USE_DELAY_SLOT);
   __ mov(v0, value);
 
   __ bind(&transition_smi_elements);
   // Transition the array appropriately depending on the value type.
   __ lw(t0, FieldMemOperand(value, HeapObject::kMapOffset));
   __ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
   __ Branch(&non_double_value, ne, t0, Operand(at));
 
-  // Value is a double. Transition FAST_SMI_ONLY_ELEMENTS ->
-  // FAST_DOUBLE_ELEMENTS and complete the store.
-  __ LoadTransitionedArrayMapConditional(FAST_SMI_ONLY_ELEMENTS,
+  // Value is a double. Transition Smi -> Double and complete the store.
+  __ LoadTransitionedArrayMapConditional(FAST_SMI_ELEMENTS,
                                          FAST_DOUBLE_ELEMENTS,
                                          receiver_map,
                                          t0,
                                          &slow);
   ASSERT(receiver_map.is(a3));  // Transition code expects map in a3
   ElementsTransitionGenerator::GenerateSmiOnlyToDouble(masm, &slow);
   __ lw(elements, FieldMemOperand(receiver, JSObject::kElementsOffset));
   __ jmp(&fast_double_without_map_check);
 
   __ bind(&non_double_value);
-  // Value is not a double, FAST_SMI_ONLY_ELEMENTS -> FAST_ELEMENTS
+  // Value is not a double, Smi -> Object elements
   __ LoadTransitionedArrayMapConditional(FAST_SMI_ONLY_ELEMENTS,
                                          FAST_ELEMENTS,
                                          receiver_map,
                                          t0,
                                          &slow);
   ASSERT(receiver_map.is(a3));  // Transition code expects map in a3
-  ElementsTransitionGenerator::GenerateSmiOnlyToObject(masm);
+  ElementsTransitionGenerator::GenerateMapChangeElementTransition(masm);
   __ lw(elements, FieldMemOperand(receiver, JSObject::kElementsOffset));
   __ jmp(&finish_object_store);
 
   __ bind(&transition_double_elements);
-  // Elements are FAST_DOUBLE_ELEMENTS, but value is an Object that's not a
-  // HeapNumber. Make sure that the receiver is a Array with FAST_ELEMENTS and
-  // transition array from FAST_DOUBLE_ELEMENTS to FAST_ELEMENTS
+  // Elements are double, but value is an Object that's not a HeapNumber. Make
+  // sure that the receiver is a Array with Object elements and transition array
+  // from double elements to Object elements.
   __ LoadTransitionedArrayMapConditional(FAST_DOUBLE_ELEMENTS,
                                          FAST_ELEMENTS,
                                          receiver_map,
                                          t0,
                                          &slow);
   ASSERT(receiver_map.is(a3));  // Transition code expects map in a3
   ElementsTransitionGenerator::GenerateDoubleToObject(masm, &slow);
   __ lw(elements, FieldMemOperand(receiver, JSObject::kElementsOffset));
   __ jmp(&finish_object_store);
 }
@@ skipping 364 matching lines @@
   } else {
     ASSERT(Assembler::IsBne(branch_instr));
     patcher.ChangeBranchCondition(eq);
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS