Add a HCurrentMethod node.
This enables register allocation for the current method, so
that users of it don't always load it from the stack.
Currently only used by HLoadClass. Will make follow-up
CLs for the other users.
Change-Id: If73324d85643102faba47fabbbd2755eb258c59c
diff --git a/compiler/optimizing/code_generator_arm64.cc b/compiler/optimizing/code_generator_arm64.cc
index ced60cd..04c38f6 100644
--- a/compiler/optimizing/code_generator_arm64.cc
+++ b/compiler/optimizing/code_generator_arm64.cc
@@ -634,16 +634,16 @@
Location location,
HInstruction* move_for) {
LocationSummary* locations = instruction->GetLocations();
- if (locations != nullptr && locations->Out().Equals(location)) {
- return;
- }
-
Primitive::Type type = instruction->GetType();
DCHECK_NE(type, Primitive::kPrimVoid);
- if (instruction->IsIntConstant()
- || instruction->IsLongConstant()
- || instruction->IsNullConstant()) {
+ if (instruction->IsCurrentMethod()) {
+ MoveLocation(location, Location::StackSlot(kCurrentMethodStackOffset));
+ } else if (locations != nullptr && locations->Out().Equals(location)) {
+ return;
+ } else if (instruction->IsIntConstant()
+ || instruction->IsLongConstant()
+ || instruction->IsNullConstant()) {
int64_t value = GetInt64ValueOf(instruction->AsConstant());
if (location.IsRegister()) {
Register dst = RegisterFrom(location, type);
@@ -2345,20 +2345,20 @@
LocationSummary::CallKind call_kind = cls->CanCallRuntime() ? LocationSummary::kCallOnSlowPath
: LocationSummary::kNoCall;
LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(cls, call_kind);
+ locations->SetInAt(0, Location::RequiresRegister());
locations->SetOut(Location::RequiresRegister());
}
void InstructionCodeGeneratorARM64::VisitLoadClass(HLoadClass* cls) {
Register out = OutputRegister(cls);
+ Register current_method = InputRegisterAt(cls, 0);
if (cls->IsReferrersClass()) {
DCHECK(!cls->CanCallRuntime());
DCHECK(!cls->MustGenerateClinitCheck());
- codegen_->LoadCurrentMethod(out);
- __ Ldr(out, HeapOperand(out, mirror::ArtMethod::DeclaringClassOffset()));
+ __ Ldr(out, HeapOperand(current_method, mirror::ArtMethod::DeclaringClassOffset()));
} else {
DCHECK(cls->CanCallRuntime());
- codegen_->LoadCurrentMethod(out);
- __ Ldr(out, HeapOperand(out, mirror::ArtMethod::DexCacheResolvedTypesOffset()));
+ __ Ldr(out, HeapOperand(current_method, mirror::ArtMethod::DexCacheResolvedTypesOffset()));
__ Ldr(out, HeapOperand(out, CodeGenerator::GetCacheOffset(cls->GetTypeIndex())));
SlowPathCodeARM64* slow_path = new (GetGraph()->GetArena()) LoadClassSlowPathARM64(
@@ -2674,9 +2674,20 @@
locations->SetOut(location);
}
-void InstructionCodeGeneratorARM64::VisitParameterValue(HParameterValue* instruction) {
+void InstructionCodeGeneratorARM64::VisitParameterValue(
+ HParameterValue* instruction ATTRIBUTE_UNUSED) {
// Nothing to do, the parameter is already at its location.
- UNUSED(instruction);
+}
+
+void LocationsBuilderARM64::VisitCurrentMethod(HCurrentMethod* instruction) {
+ LocationSummary* locations =
+ new (GetGraph()->GetArena()) LocationSummary(instruction, LocationSummary::kNoCall);
+ locations->SetOut(LocationFrom(x0));
+}
+
+void InstructionCodeGeneratorARM64::VisitCurrentMethod(
+ HCurrentMethod* instruction ATTRIBUTE_UNUSED) {
+ // Nothing to do, the method is already at its location.
}
void LocationsBuilderARM64::VisitPhi(HPhi* instruction) {