Reland Vector ICs: platform support for vector-based stores.

src/arm64/code-stubs-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/ic/handler-compiler.h"
@@ skipping 4658 matching lines @@
   GenerateImpl(masm, false);
 }
 
 
 void VectorStoreICStub::GenerateForTrampoline(MacroAssembler* masm) {
   GenerateImpl(masm, true);
 }
 
 
 void VectorStoreICStub::GenerateImpl(MacroAssembler* masm, bool in_frame) {
-  Label miss;
+  Register receiver = VectorStoreICDescriptor::ReceiverRegister();  // x1
+  Register key = VectorStoreICDescriptor::NameRegister();           // x2
+  Register vector = VectorStoreICDescriptor::VectorRegister();      // x3
+  Register slot = VectorStoreICDescriptor::SlotRegister();          // x4
+  DCHECK(VectorStoreICDescriptor::ValueRegister().is(x0));          // x0
+  Register feedback = x5;
+  Register receiver_map = x6;
+  Register scratch1 = x7;
 
-  // TODO(mvstanton): Implement.
+  __ Add(feedback, vector, Operand::UntagSmiAndScale(slot, kPointerSizeLog2));
+  __ Ldr(feedback, FieldMemOperand(feedback, FixedArray::kHeaderSize));
+
+  // Try to quickly handle the monomorphic case without knowing for sure
+  // if we have a weak cell in feedback. We do know it's safe to look
+  // at WeakCell::kValueOffset.
+  Label try_array, load_smi_map, compare_map;
+  Label not_array, miss;
+  HandleMonomorphicCase(masm, receiver, receiver_map, feedback, vector, slot,
+                        scratch1, &compare_map, &load_smi_map, &try_array);
+
+  // Is it a fixed array?
+  __ Bind(&try_array);
+  __ Ldr(scratch1, FieldMemOperand(feedback, HeapObject::kMapOffset));
+  __ JumpIfNotRoot(scratch1, Heap::kFixedArrayMapRootIndex, &not_array);
+  HandleArrayCases(masm, feedback, receiver_map, scratch1, x8, true, &miss);
+
+  __ Bind(&not_array);
+  __ JumpIfNotRoot(feedback, Heap::kmegamorphic_symbolRootIndex, &miss);
+  Code::Flags code_flags = Code::RemoveTypeAndHolderFromFlags(
+      Code::ComputeHandlerFlags(Code::STORE_IC));
+  masm->isolate()->stub_cache()->GenerateProbe(masm, Code::STORE_IC, code_flags,
+                                               receiver, key, feedback,
+                                               receiver_map, scratch1, x8);
+
   __ Bind(&miss);
   StoreIC::GenerateMiss(masm);
+
+  __ Bind(&load_smi_map);
+  __ LoadRoot(receiver_map, Heap::kHeapNumberMapRootIndex);
+  __ jmp(&compare_map);
 }
 
 
 void VectorKeyedStoreICStub::Generate(MacroAssembler* masm) {
   GenerateImpl(masm, false);
 }
 
 
 void VectorKeyedStoreICStub::GenerateForTrampoline(MacroAssembler* masm) {
   GenerateImpl(masm, true);
 }
 
 
+static void HandlePolymorphicStoreCase(MacroAssembler* masm, Register feedback,
+                                       Register receiver_map, Register scratch1,
+                                       Register scratch2, Label* miss) {
+  // feedback initially contains the feedback array
+  Label next_loop, prepare_next;
+  Label start_polymorphic;
+  Label transition_call;
+
+  Register cached_map = scratch1;
+  Register too_far = scratch2;
+  Register pointer_reg = feedback;
+
+  __ Ldr(too_far, FieldMemOperand(feedback, FixedArray::kLengthOffset));
+
+  // +-----+------+------+-----+-----+-----+ ... ----+
+  // | map | len  | wm0  | wt0 | h0  | wm1 |      hN |
+  // +-----+------+------+-----+-----+ ----+ ... ----+
+  //                 0      1     2              len-1
+  //                 ^                                 ^
+  //                 |                                 |
+  //             pointer_reg                        too_far
+  //             aka feedback                       scratch2
+  // also need receiver_map
+  // use cached_map (scratch1) to look in the weak map values.
+  __ Add(too_far, feedback,
+         Operand::UntagSmiAndScale(too_far, kPointerSizeLog2));
+  __ Add(too_far, too_far, FixedArray::kHeaderSize - kHeapObjectTag);
+  __ Add(pointer_reg, feedback,
+         FixedArray::OffsetOfElementAt(0) - kHeapObjectTag);
+
+  __ Bind(&next_loop);
+  __ Ldr(cached_map, MemOperand(pointer_reg));
+  __ Ldr(cached_map, FieldMemOperand(cached_map, WeakCell::kValueOffset));
+  __ Cmp(receiver_map, cached_map);
+  __ B(ne, &prepare_next);
+  // Is it a transitioning store?
+  __ Ldr(too_far, MemOperand(pointer_reg, kPointerSize));
+  __ CompareRoot(too_far, Heap::kUndefinedValueRootIndex);
+  __ B(ne, &transition_call);
+
+  __ Ldr(pointer_reg, MemOperand(pointer_reg, kPointerSize * 2));
+  __ Add(pointer_reg, pointer_reg, Code::kHeaderSize - kHeapObjectTag);
+  __ Jump(pointer_reg);
+
+  __ Bind(&transition_call);
+  __ Ldr(too_far, FieldMemOperand(too_far, WeakCell::kValueOffset));
+  __ JumpIfSmi(too_far, miss);
+
+  __ Ldr(receiver_map, MemOperand(pointer_reg, kPointerSize * 2));
+  // Load the map into the correct register.
+  DCHECK(feedback.is(VectorStoreTransitionDescriptor::MapRegister()));
+  __ mov(feedback, too_far);
+  __ Add(receiver_map, receiver_map, Code::kHeaderSize - kHeapObjectTag);
+  __ Jump(receiver_map);
+
+  __ Bind(&prepare_next);
+  __ Add(pointer_reg, pointer_reg, kPointerSize * 3);
+  __ Cmp(pointer_reg, too_far);
+  __ B(lt, &next_loop);
+
+  // We exhausted our array of map handler pairs.
+  __ jmp(miss);
+}
+
+
 void VectorKeyedStoreICStub::GenerateImpl(MacroAssembler* masm, bool in_frame) {
-  Label miss;
+  Register receiver = VectorStoreICDescriptor::ReceiverRegister();  // x1
+  Register key = VectorStoreICDescriptor::NameRegister();           // x2
+  Register vector = VectorStoreICDescriptor::VectorRegister();      // x3
+  Register slot = VectorStoreICDescriptor::SlotRegister();          // x4
+  DCHECK(VectorStoreICDescriptor::ValueRegister().is(x0));          // x0
+  Register feedback = x5;
+  Register receiver_map = x6;
+  Register scratch1 = x7;
 
-  // TODO(mvstanton): Implement.
+  __ Add(feedback, vector, Operand::UntagSmiAndScale(slot, kPointerSizeLog2));
+  __ Ldr(feedback, FieldMemOperand(feedback, FixedArray::kHeaderSize));
+
+  // Try to quickly handle the monomorphic case without knowing for sure
+  // if we have a weak cell in feedback. We do know it's safe to look
+  // at WeakCell::kValueOffset.
+  Label try_array, load_smi_map, compare_map;
+  Label not_array, miss;
+  HandleMonomorphicCase(masm, receiver, receiver_map, feedback, vector, slot,
+                        scratch1, &compare_map, &load_smi_map, &try_array);
+
+  __ Bind(&try_array);
+  // Is it a fixed array?
+  __ Ldr(scratch1, FieldMemOperand(feedback, HeapObject::kMapOffset));
+  __ JumpIfNotRoot(scratch1, Heap::kFixedArrayMapRootIndex, &not_array);
+
+  // We have a polymorphic element handler.
+  Label try_poly_name;
+  HandlePolymorphicStoreCase(masm, feedback, receiver_map, scratch1, x8, &miss);
+
+  __ Bind(&not_array);
+  // Is it generic?
+  __ JumpIfNotRoot(feedback, Heap::kmegamorphic_symbolRootIndex,
+                   &try_poly_name);
+  Handle<Code> megamorphic_stub =
+      KeyedStoreIC::ChooseMegamorphicStub(masm->isolate(), GetExtraICState());
+  __ Jump(megamorphic_stub, RelocInfo::CODE_TARGET);
+
+  __ Bind(&try_poly_name);
+  // We might have a name in feedback, and a fixed array in the next slot.
+  __ Cmp(key, feedback);
+  __ B(ne, &miss);
+  // If the name comparison succeeded, we know we have a fixed array with
+  // at least one map/handler pair.
+  __ Add(feedback, vector, Operand::UntagSmiAndScale(slot, kPointerSizeLog2));
+  __ Ldr(feedback,
+         FieldMemOperand(feedback, FixedArray::kHeaderSize + kPointerSize));
+  HandleArrayCases(masm, feedback, receiver_map, scratch1, x8, false, &miss);
+
   __ Bind(&miss);
   KeyedStoreIC::GenerateMiss(masm);
+
+  __ Bind(&load_smi_map);
+  __ LoadRoot(receiver_map, Heap::kHeapNumberMapRootIndex);
+  __ jmp(&compare_map);
 }
 
 
 // The entry hook is a "BumpSystemStackPointer" instruction (sub), followed by
 // a "Push lr" instruction, followed by a call.
 static const unsigned int kProfileEntryHookCallSize =
     Assembler::kCallSizeWithRelocation + (2 * kInstructionSize);
 
 
 void ProfileEntryHookStub::MaybeCallEntryHook(MacroAssembler* masm) {
@@ skipping 1178 matching lines @@
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64