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Refactor turning polymorphic loads into monomorphic loads

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- remove special code for polymorphic loading of array length
- use it in VisitCountOperation

BUG=
R=hpayer@chromium.org

Review URL: https://chromiumcodereview.appspot.com/16948005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15126 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
verwaest@chromium.org 2013-06-13 16:36:15 +00:00
parent 1d5cdf215d
commit 1d74cfaaf4
2 changed files with 37 additions and 48 deletions
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73
src/hydrogen.cc
View File

@ -6316,43 +6316,13 @@ HInstruction* HOptimizedGraphBuilder::BuildStoreNamedMonomorphic(
}
bool HOptimizedGraphBuilder::HandlePolymorphicArrayLengthLoad(
HInstruction* HOptimizedGraphBuilder::TryLoadPolymorphicAsMonomorphic(
Property* expr,
HValue* object,
SmallMapList* types,
Handle<String> name) {
if (!name->Equals(isolate()->heap()->length_string())) return false;
for (int i = 0; i < types->length(); i++) {
if (types->at(i)->instance_type() != JS_ARRAY_TYPE) return false;
}
BuildCheckNonSmi(object);
HInstruction* typecheck =
AddInstruction(HCheckMaps::New(object, types, zone()));
HInstruction* instr = new(zone())
HLoadNamedField(object, HObjectAccess::ForArrayLength(), typecheck);
instr->set_position(expr->position());
ast_context()->ReturnInstruction(instr, expr->id());
return true;
}
void HOptimizedGraphBuilder::HandlePolymorphicLoadNamedField(Property* expr,
HValue* object,
SmallMapList* types,
Handle<String> name) {
if (HandlePolymorphicArrayLengthLoad(expr, object, types, name))
return;
BuildCheckNonSmi(object);
// Use monomorphic load if property lookup results in the same field index
// for all maps. Requires special map check on the set of all handled maps.
HInstruction* instr = NULL;
LookupResult lookup(isolate());
int count;
Representation representation = Representation::None();
@ -6383,12 +6353,25 @@ void HOptimizedGraphBuilder::HandlePolymorphicLoadNamedField(Property* expr,
}
}
if (count == types->length()) {
if (count != types->length()) return NULL;
// Everything matched; can use monomorphic load.
BuildCheckNonSmi(object);
AddInstruction(HCheckMaps::New(object, types, zone()));
instr = BuildLoadNamedField(object, access, representation);
} else {
return BuildLoadNamedField(object, access, representation);
}
void HOptimizedGraphBuilder::HandlePolymorphicLoadNamedField(
Property* expr,
HValue* object,
SmallMapList* types,
Handle<String> name) {
HInstruction* instr = TryLoadPolymorphicAsMonomorphic(
expr, object, types, name);
if (instr == NULL) {
// Something did not match; must use a polymorphic load.
BuildCheckNonSmi(object);
HValue* context = environment()->LookupContext();
instr = new(zone()) HLoadNamedFieldPolymorphic(
context, object, types, name, zone());
@ -6683,10 +6666,11 @@ void HOptimizedGraphBuilder::HandleCompoundAssignment(Assignment* expr) {
Handle<String> name = prop->key()->AsLiteral()->AsPropertyName();
Handle<Map> map;
HInstruction* load;
HInstruction* load = NULL;
SmallMapList* types = prop->GetReceiverTypes();
bool monomorphic = prop->IsMonomorphic();
if (monomorphic) {
map = prop->GetReceiverTypes()->first();
map = types->first();
// We can't generate code for a monomorphic dict mode load so
// just pretend it is not monomorphic.
if (map->is_dictionary_map()) monomorphic = false;
@ -6699,9 +6683,10 @@ void HOptimizedGraphBuilder::HandleCompoundAssignment(Assignment* expr) {
} else {
load = BuildLoadNamedMonomorphic(object, name, prop, map);
}
} else {
load = BuildLoadNamedGeneric(object, name, prop);
} else if (types != NULL && types->length() > 1) {
load = TryLoadPolymorphicAsMonomorphic(prop, object, types, name);
}
if (load == NULL) load = BuildLoadNamedGeneric(object, name, prop);
PushAndAdd(load);
if (load->HasObservableSideEffects()) {
AddSimulate(prop->LoadId(), REMOVABLE_SIMULATE);
@ -6967,6 +6952,8 @@ HInstruction* HOptimizedGraphBuilder::BuildLoadNamedGeneric(
Property* expr) {
if (expr->IsUninitialized()) {
AddSoftDeoptimize();
} else {
// OS::DebugBreak();
}
HValue* context = environment()->LookupContext();
return new(zone()) HLoadNamedGeneric(context, object, name);
@ -9268,10 +9255,11 @@ void HOptimizedGraphBuilder::VisitCountOperation(CountOperation* expr) {
Handle<String> name = prop->key()->AsLiteral()->AsPropertyName();
Handle<Map> map;
HInstruction* load;
HInstruction* load = NULL;
bool monomorphic = prop->IsMonomorphic();
SmallMapList* types = prop->GetReceiverTypes();
if (monomorphic) {
map = prop->GetReceiverTypes()->first();
map = types->first();
if (map->is_dictionary_map()) monomorphic = false;
}
if (monomorphic) {
@ -9282,9 +9270,10 @@ void HOptimizedGraphBuilder::VisitCountOperation(CountOperation* expr) {
} else {
load = BuildLoadNamedMonomorphic(object, name, prop, map);
}
} else {
load = BuildLoadNamedGeneric(object, name, prop);
} else if (types != NULL && types->length() > 1) {
load = TryLoadPolymorphicAsMonomorphic(prop, object, types, name);
}
if (load == NULL) load = BuildLoadNamedGeneric(object, name, prop);
PushAndAdd(load);
if (load->HasObservableSideEffects()) {
AddSimulate(prop->LoadId(), REMOVABLE_SIMULATE);

2
src/hydrogen.h
View File

@ -1701,7 +1701,7 @@ class HOptimizedGraphBuilder: public HGraphBuilder, public AstVisitor {
HValue* object,
SmallMapList* types,
Handle<String> name);
bool HandlePolymorphicArrayLengthLoad(Property* expr,
HInstruction* TryLoadPolymorphicAsMonomorphic(Property* expr,
HValue* object,
SmallMapList* types,
Handle<String> name);