Implement tracking and optimizations of packed arrays.

src/ia32/code-stubs-ia32.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 7041 matching lines @@
   // GenerateStoreField calls the stub with two different permutations of
   // registers.  This is the second.
   { REG(ebx), REG(ecx), REG(edx), EMIT_REMEMBERED_SET },
   // StoreIC::GenerateNormal via GenerateDictionaryStore
   { REG(ebx), REG(edi), REG(edx), EMIT_REMEMBERED_SET },
   // KeyedStoreIC::GenerateGeneric.
   { REG(ebx), REG(edx), REG(ecx), EMIT_REMEMBERED_SET},
   // KeyedStoreStubCompiler::GenerateStoreFastElement.
   { REG(edi), REG(ebx), REG(ecx), EMIT_REMEMBERED_SET},
   { REG(edx), REG(edi), REG(ebx), EMIT_REMEMBERED_SET},
-  // ElementsTransitionGenerator::GenerateSmiOnlyToObject
+  // ElementsTransitionGenerator::GenerateMapChangeElementTransition
   // and ElementsTransitionGenerator::GenerateSmiOnlyToDouble
   // and ElementsTransitionGenerator::GenerateDoubleToObject
   { REG(edx), REG(ebx), REG(edi), EMIT_REMEMBERED_SET},
   { REG(edx), REG(ebx), REG(edi), OMIT_REMEMBERED_SET},
   // ElementsTransitionGenerator::GenerateDoubleToObject
   { REG(eax), REG(edx), REG(esi), EMIT_REMEMBERED_SET},
   { REG(edx), REG(eax), REG(edi), EMIT_REMEMBERED_SET},
   // StoreArrayLiteralElementStub::Generate
   { REG(ebx), REG(eax), REG(ecx), EMIT_REMEMBERED_SET},
   // Null termination.
@@ skipping 252 matching lines @@
 
   Label element_done;
   Label double_elements;
   Label smi_element;
   Label slow_elements;
   Label slow_elements_from_double;
   Label fast_elements;
 
   __ CheckFastElements(edi, &double_elements);
 
-  // FAST_SMI_ONLY_ELEMENTS or FAST_ELEMENTS
+  // Check for Smi-only or Object elements
   __ JumpIfSmi(eax, &smi_element);
   __ CheckFastSmiOnlyElements(edi, &fast_elements, Label::kNear);
 
   // Store into the array literal requires a elements transition. Call into
   // the runtime.
 
   __ bind(&slow_elements);
   __ pop(edi);  // Pop return address and remember to put back later for tail
                 // call.
   __ push(ebx);
   __ push(ecx);
   __ push(eax);
   __ mov(ebx, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
   __ push(FieldOperand(ebx, JSFunction::kLiteralsOffset));
   __ push(edx);
   __ push(edi);  // Return return address so that tail call returns to right
                  // place.
   __ TailCallRuntime(Runtime::kStoreArrayLiteralElement, 5, 1);
 
   __ bind(&slow_elements_from_double);
   __ pop(edx);
   __ jmp(&slow_elements);
 
-  // Array literal has ElementsKind of FAST_ELEMENTS and value is an object.
+  // Array literal has ElementsKind of FAST_*_ELEMENTS and value is an object.
   __ bind(&fast_elements);
   __ mov(ebx, FieldOperand(ebx, JSObject::kElementsOffset));
   __ lea(ecx, FieldOperand(ebx, ecx, times_half_pointer_size,
                            FixedArrayBase::kHeaderSize));
   __ mov(Operand(ecx, 0), eax);
   // Update the write barrier for the array store.
   __ RecordWrite(ebx, ecx, eax,
                  kDontSaveFPRegs,
                  EMIT_REMEMBERED_SET,
                  OMIT_SMI_CHECK);
   __ ret(0);
 
-  // Array literal has ElementsKind of FAST_SMI_ONLY_ELEMENTS or
-  // FAST_ELEMENTS, and value is Smi.
+  // Array literal has ElementsKind of Smi-only or Object, and value is Smi.
   __ bind(&smi_element);
   __ mov(ebx, FieldOperand(ebx, JSObject::kElementsOffset));
   __ mov(FieldOperand(ebx, ecx, times_half_pointer_size,
                       FixedArrayBase::kHeaderSize), eax);
   __ ret(0);
 
   // Array literal has ElementsKind of FAST_DOUBLE_ELEMENTS.
   __ bind(&double_elements);
 
   __ push(edx);
   __ mov(edx, FieldOperand(ebx, JSObject::kElementsOffset));
   __ StoreNumberToDoubleElements(eax,
                                  edx,
                                  ecx,
                                  edi,
                                  xmm0,
                                  &slow_elements_from_double,
                                  false);
   __ pop(edx);
   __ ret(0);
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32