AuroraMiddleware/v8
1
0
Fork 0
Code Issues 2 Pull Requests Releases Wiki Activity

MIPS: Optimize Crankshaft array literal initialization from boilerplate.

Browse Source 
Port r10138 (730f5a7f)

Original commit message:

BUG=
TEST=

Review URL: http://codereview.chromium.org/8789012
Patch from Daniel Kalmar <kalmard@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10191 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
danno@chromium.org 2011-12-07 13:00:11 +00:00
parent c1662a199b
commit aaf393a4dc
1 changed files with 25 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
src/mips/lithium-codegen-mips.cc
View File

@ -4126,15 +4126,32 @@ void LCodeGen::DoCheckPrototypeMaps(LCheckPrototypeMaps* instr) {
void LCodeGen::DoArrayLiteral(LArrayLiteral* instr) {
Handle<FixedArray> constant_elements = instr->hydrogen()->constant_elements();
ASSERT_EQ(2, constant_elements->length());
ElementsKind constant_elements_kind =
static_cast<ElementsKind>(Smi::cast(constant_elements->get(0))->value());
Heap* heap = isolate()->heap();
ElementsKind boilerplate_elements_kind =
instr->hydrogen()->boilerplate_elements_kind();
// Deopt if the array literal boilerplate ElementsKind is of a type different
// than the expected one. The check isn't necessary if the boilerplate has
// already been converted to FAST_ELEMENTS.
if (boilerplate_elements_kind != FAST_ELEMENTS) {
LoadHeapObject(a1, instr->hydrogen()->boilerplate_object());
// Load map into a2.
__ lw(a2, FieldMemOperand(a1, HeapObject::kMapOffset));
// Load the map's "bit field 2".
__ lbu(a2, FieldMemOperand(a2, Map::kBitField2Offset));
// Retrieve elements_kind from bit field 2.
__ Ext(a2, a2, Map::kElementsKindShift, Map::kElementsKindBitCount);
DeoptimizeIf(ne,
instr->environment(),
a2,
Operand(boilerplate_elements_kind));
}
__ lw(a3, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
__ lw(a3, FieldMemOperand(a3, JSFunction::kLiteralsOffset));
__ li(a2, Operand(Smi::FromInt(instr->hydrogen()->literal_index())));
__ li(a1, Operand(constant_elements));
// Boilerplate already exists, constant elements are never accessed.
// Pass an empty fixed array.
__ li(a1, Operand(Handle<FixedArray>(heap->empty_fixed_array())));
__ Push(a3, a2, a1);
// Pick the right runtime function or stub to call.
@ -4151,9 +4168,9 @@ void LCodeGen::DoArrayLiteral(LArrayLiteral* instr) {
CallRuntime(Runtime::kCreateArrayLiteralShallow, 3, instr);
} else {
FastCloneShallowArrayStub::Mode mode =
constant_elements_kind == FAST_DOUBLE_ELEMENTS
? FastCloneShallowArrayStub::CLONE_DOUBLE_ELEMENTS
: FastCloneShallowArrayStub::CLONE_ELEMENTS;
boilerplate_elements_kind == FAST_DOUBLE_ELEMENTS
? FastCloneShallowArrayStub::CLONE_DOUBLE_ELEMENTS
: FastCloneShallowArrayStub::CLONE_ELEMENTS;
FastCloneShallowArrayStub stub(mode, length);
CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
}