Implement tracking and optimizations of packed arrays

src/mips/code-stubs-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 7344 matching lines @@
   { REG(t0), REG(a1), REG(a2), OMIT_REMEMBERED_SET },
   // Used in StoreStubCompiler::CompileStoreField via GenerateStoreField.
   { REG(a1), REG(a2), REG(a3), EMIT_REMEMBERED_SET },
   { REG(a3), REG(a2), REG(a1), EMIT_REMEMBERED_SET },
   // Used in KeyedStoreStubCompiler::CompileStoreField via GenerateStoreField.
   { REG(a2), REG(a1), REG(a3), EMIT_REMEMBERED_SET },
   { REG(a3), REG(a1), REG(a2), EMIT_REMEMBERED_SET },
   // KeyedStoreStubCompiler::GenerateStoreFastElement.
   { REG(a3), REG(a2), REG(t0), EMIT_REMEMBERED_SET },
   { REG(a2), REG(a3), REG(t0), EMIT_REMEMBERED_SET },
-  // ElementsTransitionGenerator::GenerateSmiOnlyToObject
+  // ElementsTransitionGenerator::GenerateMapChangeElementTransition
   // and ElementsTransitionGenerator::GenerateSmiOnlyToDouble
   // and ElementsTransitionGenerator::GenerateDoubleToObject
   { REG(a2), REG(a3), REG(t5), EMIT_REMEMBERED_SET },
   { REG(a2), REG(a3), REG(t5), OMIT_REMEMBERED_SET },
   // ElementsTransitionGenerator::GenerateDoubleToObject
   { REG(t2), REG(a2), REG(a0), EMIT_REMEMBERED_SET },
   { REG(a2), REG(t2), REG(t5), EMIT_REMEMBERED_SET },
   // StoreArrayLiteralElementStub::Generate
   { REG(t1), REG(a0), REG(t2), EMIT_REMEMBERED_SET },
   // Null termination.
@@ skipping 246 matching lines @@
   //  -- t0    : array literal index in function as smi
   // -----------------------------------
 
   Label element_done;
   Label double_elements;
   Label smi_element;
   Label slow_elements;
   Label fast_elements;
 
   __ CheckFastElements(a2, t1, &double_elements);
-  // FAST_SMI_ONLY_ELEMENTS or FAST_ELEMENTS
+  // Check Smi or Object elements
   __ JumpIfSmi(a0, &smi_element);
   __ CheckFastSmiOnlyElements(a2, t1, &fast_elements);
 
   // Store into the array literal requires a elements transition. Call into
   // the runtime.
   __ bind(&slow_elements);
   // call.
   __ Push(a1, a3, a0);
   __ lw(t1, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
   __ lw(t1, FieldMemOperand(t1, JSFunction::kLiteralsOffset));
   __ Push(t1, t0);
   __ TailCallRuntime(Runtime::kStoreArrayLiteralElement, 5, 1);
 
   // Array literal has ElementsKind of FAST_ELEMENTS and value is an object.
   __ bind(&fast_elements);
   __ lw(t1, FieldMemOperand(a1, JSObject::kElementsOffset));
   __ sll(t2, a3, kPointerSizeLog2 - kSmiTagSize);
   __ Addu(t2, t1, t2);
   __ Addu(t2, t2, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
   __ sw(a0, MemOperand(t2, 0));
   // Update the write barrier for the array store.
   __ RecordWrite(t1, t2, a0, kRAHasNotBeenSaved, kDontSaveFPRegs,
                  EMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
   __ Ret(USE_DELAY_SLOT);
   __ mov(v0, a0);
 
-  // Array literal has ElementsKind of FAST_SMI_ONLY_ELEMENTS or
-  // FAST_ELEMENTS, and value is Smi.
+  // Array literal has FAST_* elements and value is Smi.
   __ bind(&smi_element);
   __ lw(t1, FieldMemOperand(a1, JSObject::kElementsOffset));
   __ sll(t2, a3, kPointerSizeLog2 - kSmiTagSize);
   __ Addu(t2, t1, t2);
   __ sw(a0, FieldMemOperand(t2, FixedArray::kHeaderSize));
   __ Ret(USE_DELAY_SLOT);
   __ mov(v0, a0);
 
   // Array literal has ElementsKind of FAST_DOUBLE_ELEMENTS.
   __ bind(&double_elements);
   __ lw(t1, FieldMemOperand(a1, JSObject::kElementsOffset));
   __ StoreNumberToDoubleElements(a0, a3, a1, t1, t2, t3, t5, a2,
                                  &slow_elements);
   __ Ret(USE_DELAY_SLOT);
   __ mov(v0, a0);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS