Vector ICs: platform support for vector-based stores.

src/mips/code-stubs-mips.cc

 // Copyright 2012 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_MIPS
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 4753 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();  // a1
+  Register key = VectorStoreICDescriptor::NameRegister();           // a2
+  Register vector = VectorStoreICDescriptor::VectorRegister();      // a3
+  Register slot = VectorStoreICDescriptor::SlotRegister();          // t0
+  DCHECK(VectorStoreICDescriptor::ValueRegister().is(a0));          // a0
+  Register feedback = t1;
+  Register receiver_map = t2;
+  Register scratch1 = t5;
 
-  // TODO(mvstanton): Implement.
+  __ sll(scratch1, slot, kPointerSizeLog2 - kSmiTagSize);
+  __ Addu(feedback, vector, Operand(scratch1));
+  __ lw(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);
+  __ lw(scratch1, FieldMemOperand(feedback, HeapObject::kMapOffset));
+  __ LoadRoot(at, Heap::kFixedArrayMapRootIndex);
+  __ Branch(&not_array, ne, scratch1, Operand(at));
+
+  Register scratch2 = t4;
+  HandleArrayCases(masm, feedback, receiver_map, scratch1, scratch2, true,
+                   &miss);
+
+  __ bind(&not_array);
+  __ LoadRoot(at, Heap::kmegamorphic_symbolRootIndex);
+  __ Branch(&miss, ne, feedback, Operand(at));
+  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, scratch2);
+
   __ bind(&miss);
   StoreIC::GenerateMiss(masm);
+
+  __ bind(&load_smi_map);
+  __ Branch(USE_DELAY_SLOT, &compare_map);
+  __ LoadRoot(receiver_map, Heap::kHeapNumberMapRootIndex);  // In delay slot.
 }
 
 
 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;
+  __ lw(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.
+  __ sll(scratch1, too_far, kPointerSizeLog2 - kSmiTagSize);
+  __ Addu(too_far, feedback, Operand(scratch1));
+  __ Addu(too_far, too_far, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ Addu(pointer_reg, feedback,
+          Operand(FixedArray::OffsetOfElementAt(0) - kHeapObjectTag));
+
+  __ bind(&next_loop);
+  __ lw(cached_map, MemOperand(pointer_reg));
+  __ lw(cached_map, FieldMemOperand(cached_map, WeakCell::kValueOffset));
+  __ Branch(&prepare_next, ne, receiver_map, Operand(cached_map));
+  // Is it a transitioning store?
+  __ lw(too_far, MemOperand(pointer_reg, kPointerSize));
+  __ LoadRoot(at, Heap::kUndefinedValueRootIndex);
+  __ Branch(&transition_call, ne, too_far, Operand(at));
+  __ lw(pointer_reg, MemOperand(pointer_reg, kPointerSize * 2));
+  __ Addu(t9, pointer_reg, Operand(Code::kHeaderSize - kHeapObjectTag));
+  __ Jump(t9);
+
+  __ bind(&transition_call);
+  __ lw(too_far, FieldMemOperand(too_far, WeakCell::kValueOffset));
+  __ JumpIfSmi(too_far, miss);
+
+  __ lw(receiver_map, MemOperand(pointer_reg, kPointerSize * 2));
+
+  // Load the map into the correct register.
+  DCHECK(feedback.is(VectorStoreTransitionDescriptor::MapRegister()));
+  __ mov(feedback, too_far);
+
+  __ Addu(t9, receiver_map, Operand(Code::kHeaderSize - kHeapObjectTag));
+  __ Jump(t9);
+
+  __ bind(&prepare_next);
+  __ Addu(pointer_reg, pointer_reg, Operand(kPointerSize * 3));
+  __ Branch(&next_loop, lt, pointer_reg, Operand(too_far));
+
+  // We exhausted our array of map handler pairs.
+  __ jmp(miss);
+}
+
+
 void VectorKeyedStoreICStub::GenerateImpl(MacroAssembler* masm, bool in_frame) {
-  Label miss;
+  Register receiver = VectorStoreICDescriptor::ReceiverRegister();  // a1
+  Register key = VectorStoreICDescriptor::NameRegister();           // a2
+  Register vector = VectorStoreICDescriptor::VectorRegister();      // a3
+  Register slot = VectorStoreICDescriptor::SlotRegister();          // t0
+  DCHECK(VectorStoreICDescriptor::ValueRegister().is(a0));          // a0
+  Register feedback = t1;
+  Register receiver_map = t2;
+  Register scratch1 = t5;
 
-  // TODO(mvstanton): Implement.
+  __ sll(scratch1, slot, kPointerSizeLog2 - kSmiTagSize);
+  __ Addu(feedback, vector, Operand(scratch1));
+  __ lw(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?
+  __ lw(scratch1, FieldMemOperand(feedback, HeapObject::kMapOffset));
+  __ LoadRoot(at, Heap::kFixedArrayMapRootIndex);
+  __ Branch(&not_array, ne, scratch1, Operand(at));
+
+  // We have a polymorphic element handler.
+  Label polymorphic, try_poly_name;
+  __ bind(&polymorphic);
+
+  Register scratch2 = t4;
+
+  HandlePolymorphicStoreCase(masm, feedback, receiver_map, scratch1, scratch2,
+                             &miss);
+
+  __ bind(&not_array);
+  // Is it generic?
+  __ LoadRoot(at, Heap::kmegamorphic_symbolRootIndex);
+  __ Branch(&try_poly_name, ne, feedback, Operand(at));
+  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.
+  __ Branch(&miss, ne, key, Operand(feedback));
+  // If the name comparison succeeded, we know we have a fixed array with
+  // at least one map/handler pair.
+  __ sll(scratch1, slot, kPointerSizeLog2 - kSmiTagSize);
+  __ Addu(feedback, vector, Operand(scratch1));
+  __ lw(feedback,
+        FieldMemOperand(feedback, FixedArray::kHeaderSize + kPointerSize));
+  HandleArrayCases(masm, feedback, receiver_map, scratch1, scratch2, false,
+                   &miss);
+
   __ bind(&miss);
   KeyedStoreIC::GenerateMiss(masm);
+
+  __ bind(&load_smi_map);
+  __ Branch(USE_DELAY_SLOT, &compare_map);
+  __ LoadRoot(receiver_map, Heap::kHeapNumberMapRootIndex);  // In delay slot.
 }
 
 
 void ProfileEntryHookStub::MaybeCallEntryHook(MacroAssembler* masm) {
   if (masm->isolate()->function_entry_hook() != NULL) {
     ProfileEntryHookStub stub(masm->isolate());
     __ push(ra);
     __ CallStub(&stub);
     __ pop(ra);
   }
@@ skipping 821 matching lines @@
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS