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First implementation of fast path for instantiation of array literals composed of doubles.

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Review URL: https://chromiumcodereview.appspot.com/9814006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11114 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
mmassi@chromium.org 2012-03-23 10:14:51 +00:00
parent 4cb600962f
commit c39c2089a7
6 changed files with 133 additions and 72 deletions
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57
src/arm/lithium-codegen-arm.cc
View File

@ -4616,34 +4616,51 @@ void LCodeGen::EmitDeepCopy(Handle<JSObject> object,
}
}
// Copy elements backing store header.
ASSERT(!has_elements || elements->IsFixedArray());
if (has_elements) {
// Copy elements backing store header.
__ LoadHeapObject(source, elements);
for (int i = 0; i < FixedArray::kHeaderSize; i += kPointerSize) {
__ ldr(r2, FieldMemOperand(source, i));
__ str(r2, FieldMemOperand(result, elements_offset + i));
}
}
// Copy elements backing store content.
ASSERT(!has_elements || elements->IsFixedArray());
int elements_length = has_elements ? elements->length() : 0;
for (int i = 0; i < elements_length; i++) {
int total_offset = elements_offset + FixedArray::OffsetOfElementAt(i);
Handle<Object> value = JSObject::GetElement(object, i);
if (value->IsJSObject()) {
Handle<JSObject> value_object = Handle<JSObject>::cast(value);
__ add(r2, result, Operand(*offset));
__ str(r2, FieldMemOperand(result, total_offset));
__ LoadHeapObject(source, value_object);
EmitDeepCopy(value_object, result, source, offset);
} else if (value->IsHeapObject()) {
__ LoadHeapObject(r2, Handle<HeapObject>::cast(value));
__ str(r2, FieldMemOperand(result, total_offset));
// Copy elements backing store content.
int elements_length = has_elements ? elements->length() : 0;
if (elements->IsFixedDoubleArray()) {
Handle<FixedDoubleArray> double_array =
Handle<FixedDoubleArray>::cast(elements);
for (int i = 0; i < elements_length; i++) {
int64_t value = double_array->get_representation(i);
// We only support little endian mode...
int32_t value_low = value & 0xFFFFFFFF;
int32_t value_high = value >> 32;
int total_offset =
elements_offset + FixedDoubleArray::OffsetOfElementAt(i);
__ mov(r2, Operand(value_low));
__ str(r2, FieldMemOperand(result, total_offset));
__ mov(r2, Operand(value_high));
__ str(r2, FieldMemOperand(result, total_offset + 4));
}
} else if (elements->IsFixedArray()) {
for (int i = 0; i < elements_length; i++) {
int total_offset = elements_offset + FixedArray::OffsetOfElementAt(i);
Handle<Object> value = JSObject::GetElement(object, i);
if (value->IsJSObject()) {
Handle<JSObject> value_object = Handle<JSObject>::cast(value);
__ add(r2, result, Operand(*offset));
__ str(r2, FieldMemOperand(result, total_offset));
__ LoadHeapObject(source, value_object);
EmitDeepCopy(value_object, result, source, offset);
} else if (value->IsHeapObject()) {
__ LoadHeapObject(r2, Handle<HeapObject>::cast(value));
__ str(r2, FieldMemOperand(result, total_offset));
} else {
__ mov(r2, Operand(value));
__ str(r2, FieldMemOperand(result, total_offset));
}
}
} else {
__ mov(r2, Operand(value));
__ str(r2, FieldMemOperand(result, total_offset));
UNREACHABLE();
}
}
}

31
src/hydrogen.cc
View File

@ -3683,22 +3683,27 @@ static bool IsFastLiteral(Handle<JSObject> boilerplate,
Handle<FixedArrayBase> elements(boilerplate->elements());
if (elements->length() > 0 &&
elements->map() != boilerplate->GetHeap()->fixed_cow_array_map()) {
if (!boilerplate->HasFastElements()) return false;
int length = elements->length();
for (int i = 0; i < length; i++) {
if ((*max_properties)-- == 0) return false;
Handle<Object> value = JSObject::GetElement(boilerplate, i);
if (value->IsJSObject()) {
Handle<JSObject> value_object = Handle<JSObject>::cast(value);
if (!IsFastLiteral(value_object,
max_depth - 1,
max_properties,
total_size)) {
return false;
if (boilerplate->HasFastDoubleElements()) {
*total_size += FixedDoubleArray::SizeFor(elements->length());
} else if (boilerplate->HasFastElements()) {
int length = elements->length();
for (int i = 0; i < length; i++) {
if ((*max_properties)-- == 0) return false;
Handle<Object> value = JSObject::GetElement(boilerplate, i);
if (value->IsJSObject()) {
Handle<JSObject> value_object = Handle<JSObject>::cast(value);
if (!IsFastLiteral(value_object,
max_depth - 1,
max_properties,
total_size)) {
return false;
}
}
}
*total_size += FixedArray::SizeFor(length);
} else {
return false;
}
*total_size += FixedArray::SizeFor(length);
}
Handle<FixedArray> properties(boilerplate->properties());

52
src/ia32/lithium-codegen-ia32.cc
View File

@ -4470,33 +4470,47 @@ void LCodeGen::EmitDeepCopy(Handle<JSObject> object,
}
}
// Copy elements backing store header.
ASSERT(!has_elements || elements->IsFixedArray());
if (has_elements) {
// Copy elements backing store header.
__ LoadHeapObject(source, elements);
for (int i = 0; i < FixedArray::kHeaderSize; i += kPointerSize) {
__ mov(ecx, FieldOperand(source, i));
__ mov(FieldOperand(result, elements_offset + i), ecx);
}
}
// Copy elements backing store content.
ASSERT(!has_elements || elements->IsFixedArray());
int elements_length = has_elements ? elements->length() : 0;
for (int i = 0; i < elements_length; i++) {
int total_offset = elements_offset + FixedArray::OffsetOfElementAt(i);
Handle<Object> value = JSObject::GetElement(object, i);
if (value->IsJSObject()) {
Handle<JSObject> value_object = Handle<JSObject>::cast(value);
__ lea(ecx, Operand(result, *offset));
__ mov(FieldOperand(result, total_offset), ecx);
__ LoadHeapObject(source, value_object);
EmitDeepCopy(value_object, result, source, offset);
} else if (value->IsHeapObject()) {
__ LoadHeapObject(ecx, Handle<HeapObject>::cast(value));
__ mov(FieldOperand(result, total_offset), ecx);
// Copy elements backing store content.
int elements_length = elements->length();
if (elements->IsFixedDoubleArray()) {
Handle<FixedDoubleArray> double_array =
Handle<FixedDoubleArray>::cast(elements);
for (int i = 0; i < elements_length; i++) {
int64_t value = double_array->get_representation(i);
int32_t value_low = value & 0xFFFFFFFF;
int32_t value_high = value >> 32;
int total_offset =
elements_offset + FixedDoubleArray::OffsetOfElementAt(i);
__ mov(FieldOperand(result, total_offset), Immediate(value_low));
__ mov(FieldOperand(result, total_offset + 4), Immediate(value_high));
}
} else if (elements->IsFixedArray()) {
for (int i = 0; i < elements_length; i++) {
int total_offset = elements_offset + FixedArray::OffsetOfElementAt(i);
Handle<Object> value = JSObject::GetElement(object, i);
if (value->IsJSObject()) {
Handle<JSObject> value_object = Handle<JSObject>::cast(value);
__ lea(ecx, Operand(result, *offset));
__ mov(FieldOperand(result, total_offset), ecx);
__ LoadHeapObject(source, value_object);
EmitDeepCopy(value_object, result, source, offset);
} else if (value->IsHeapObject()) {
__ LoadHeapObject(ecx, Handle<HeapObject>::cast(value));
__ mov(FieldOperand(result, total_offset), ecx);
} else {
__ mov(FieldOperand(result, total_offset), Immediate(value));
}
}
} else {
__ mov(FieldOperand(result, total_offset), Immediate(value));
UNREACHABLE();
}
}
}

12
src/objects-inl.h
View File

@ -944,6 +944,12 @@ MaybeObject* Object::GetProperty(String* key, PropertyAttributes* attributes) {
#define WRITE_UINT32_FIELD(p, offset, value) \
(*reinterpret_cast<uint32_t*>(FIELD_ADDR(p, offset)) = value)
#define READ_INT64_FIELD(p, offset) \
(*reinterpret_cast<int64_t*>(FIELD_ADDR(p, offset)))
#define WRITE_INT64_FIELD(p, offset, value) \
(*reinterpret_cast<int64_t*>(FIELD_ADDR(p, offset)) = value)
#define READ_SHORT_FIELD(p, offset) \
(*reinterpret_cast<uint16_t*>(FIELD_ADDR(p, offset)))
@ -1701,6 +1707,12 @@ double FixedDoubleArray::get_scalar(int index) {
return result;
}
int64_t FixedDoubleArray::get_representation(int index) {
ASSERT(map() != HEAP->fixed_cow_array_map() &&
map() != HEAP->fixed_array_map());
ASSERT(index >= 0 && index < this->length());
return READ_INT64_FIELD(this, kHeaderSize + index * kDoubleSize);
}
MaybeObject* FixedDoubleArray::get(int index) {
if (is_the_hole(index)) {

1
src/objects.h
View File

@ -2345,6 +2345,7 @@ class FixedDoubleArray: public FixedArrayBase {
public:
// Setter and getter for elements.
inline double get_scalar(int index);
inline int64_t get_representation(int index);
MUST_USE_RESULT inline MaybeObject* get(int index);
inline void set(int index, double value);
inline void set_the_hole(int index);

52
src/x64/lithium-codegen-x64.cc
View File

@ -4238,34 +4238,46 @@ void LCodeGen::EmitDeepCopy(Handle<JSObject> object,
}
}
// Copy elements backing store header.
ASSERT(!has_elements || elements->IsFixedArray());
if (has_elements) {
// Copy elements backing store header.
__ LoadHeapObject(source, elements);
for (int i = 0; i < FixedArray::kHeaderSize; i += kPointerSize) {
__ movq(rcx, FieldOperand(source, i));
__ movq(FieldOperand(result, elements_offset + i), rcx);
}
}
// Copy elements backing store content.
ASSERT(!has_elements || elements->IsFixedArray());
int elements_length = has_elements ? elements->length() : 0;
for (int i = 0; i < elements_length; i++) {
int total_offset = elements_offset + FixedArray::OffsetOfElementAt(i);
Handle<Object> value = JSObject::GetElement(object, i);
if (value->IsJSObject()) {
Handle<JSObject> value_object = Handle<JSObject>::cast(value);
__ lea(rcx, Operand(result, *offset));
__ movq(FieldOperand(result, total_offset), rcx);
__ LoadHeapObject(source, value_object);
EmitDeepCopy(value_object, result, source, offset);
} else if (value->IsHeapObject()) {
__ LoadHeapObject(rcx, Handle<HeapObject>::cast(value));
__ movq(FieldOperand(result, total_offset), rcx);
// Copy elements backing store content.
int elements_length = elements->length();
if (elements->IsFixedDoubleArray()) {
Handle<FixedDoubleArray> double_array =
Handle<FixedDoubleArray>::cast(elements);
for (int i = 0; i < elements_length; i++) {
int64_t value = double_array->get_representation(i);
int total_offset =
elements_offset + FixedDoubleArray::OffsetOfElementAt(i);
__ movq(rcx, value, RelocInfo::NONE);
__ movq(FieldOperand(result, total_offset), rcx);
}
} else if (elements->IsFixedArray()) {
for (int i = 0; i < elements_length; i++) {
int total_offset = elements_offset + FixedArray::OffsetOfElementAt(i);
Handle<Object> value = JSObject::GetElement(object, i);
if (value->IsJSObject()) {
Handle<JSObject> value_object = Handle<JSObject>::cast(value);
__ lea(rcx, Operand(result, *offset));
__ movq(FieldOperand(result, total_offset), rcx);
__ LoadHeapObject(source, value_object);
EmitDeepCopy(value_object, result, source, offset);
} else if (value->IsHeapObject()) {
__ LoadHeapObject(rcx, Handle<HeapObject>::cast(value));
__ movq(FieldOperand(result, total_offset), rcx);
} else {
__ movq(rcx, value, RelocInfo::NONE);
__ movq(FieldOperand(result, total_offset), rcx);
}
}
} else {
__ movq(rcx, value, RelocInfo::NONE);
__ movq(FieldOperand(result, total_offset), rcx);
UNREACHABLE();
}
}
}