Use weak cell to embed known map in CompareIC

BUG=v8:3663
LOG=N

Review URL: https://codereview.chromium.org/879333005

Cr-Commit-Position: refs/heads/master@{#26386}

src/arm/code-stubs-arm.cc

@@ -3661,13 +3661,15 @@ void CompareICStub::GenerateObjects(MacroAssembler* masm) {
 
 void CompareICStub::GenerateKnownObjects(MacroAssembler* masm) {
   Label miss;
+  Handle<WeakCell> cell = Map::WeakCellForMap(known_map_);
   __ and_(r2, r1, Operand(r0));
   __ JumpIfSmi(r2, &miss);
+  __ GetWeakValue(r4, cell);
   __ ldr(r2, FieldMemOperand(r0, HeapObject::kMapOffset));
   __ ldr(r3, FieldMemOperand(r1, HeapObject::kMapOffset));
-  __ cmp(r2, Operand(known_map_));
+  __ cmp(r2, r4);
   __ b(ne, &miss);
-  __ cmp(r3, Operand(known_map_));
+  __ cmp(r3, r4);
   __ b(ne, &miss);
 
   __ sub(r0, r0, Operand(r1));

src/arm64/code-stubs-arm64.cc

@@ -3574,6 +3574,7 @@ void CompareICStub::GenerateKnownObjects(MacroAssembler* masm) {
   ASM_LOCATION("CompareICStub[KnownObjects]");
 
   Label miss;
+  Handle<WeakCell> cell = Map::WeakCellForMap(known_map_);
 
   Register result = x0;
   Register rhs = x0;
@@ -3583,11 +3584,13 @@ void CompareICStub::GenerateKnownObjects(MacroAssembler* masm) {
 
   Register rhs_map = x10;
   Register lhs_map = x11;
+  Register map = x12;
+  __ GetWeakValue(map, cell);
   __ Ldr(rhs_map, FieldMemOperand(rhs, HeapObject::kMapOffset));
   __ Ldr(lhs_map, FieldMemOperand(lhs, HeapObject::kMapOffset));
-  __ Cmp(rhs_map, Operand(known_map_));
+  __ Cmp(rhs_map, map);
   __ B(ne, &miss);
-  __ Cmp(lhs_map, Operand(known_map_));
+  __ Cmp(lhs_map, map);
   __ B(ne, &miss);
 
   __ Sub(result, rhs, lhs);

src/ia32/code-stubs-ia32.cc

@@ -3776,15 +3776,17 @@ void CompareICStub::GenerateObjects(MacroAssembler* masm) {
 
 void CompareICStub::GenerateKnownObjects(MacroAssembler* masm) {
   Label miss;
+  Handle<WeakCell> cell = Map::WeakCellForMap(known_map_);
   __ mov(ecx, edx);
   __ and_(ecx, eax);
   __ JumpIfSmi(ecx, &miss, Label::kNear);
 
+  __ GetWeakValue(edi, cell);
   __ mov(ecx, FieldOperand(eax, HeapObject::kMapOffset));
   __ mov(ebx, FieldOperand(edx, HeapObject::kMapOffset));
-  __ cmp(ecx, known_map_);
+  __ cmp(ecx, edi);
   __ j(not_equal, &miss, Label::kNear);
-  __ cmp(ebx, known_map_);
+  __ cmp(ebx, edi);
   __ j(not_equal, &miss, Label::kNear);
 
   __ sub(eax, edx);

src/x64/code-stubs-x64.cc

@@ -3718,14 +3718,16 @@ void CompareICStub::GenerateObjects(MacroAssembler* masm) {
 
 void CompareICStub::GenerateKnownObjects(MacroAssembler* masm) {
   Label miss;
+  Handle<WeakCell> cell = Map::WeakCellForMap(known_map_);
   Condition either_smi = masm->CheckEitherSmi(rdx, rax);
   __ j(either_smi, &miss, Label::kNear);
 
+  __ GetWeakValue(rdi, cell);
   __ movp(rcx, FieldOperand(rax, HeapObject::kMapOffset));
   __ movp(rbx, FieldOperand(rdx, HeapObject::kMapOffset));
-  __ Cmp(rcx, known_map_);
+  __ cmpp(rcx, rdi);
   __ j(not_equal, &miss, Label::kNear);
-  __ Cmp(rbx, known_map_);
+  __ cmpp(rbx, rdi);
   __ j(not_equal, &miss, Label::kNear);
 
   __ subp(rax, rdx);

src/x87/code-stubs-x87.cc

@@ -3437,15 +3437,17 @@ void CompareICStub::GenerateObjects(MacroAssembler* masm) {
 
 void CompareICStub::GenerateKnownObjects(MacroAssembler* masm) {
   Label miss;
+  Handle<WeakCell> cell = Map::WeakCellForMap(known_map_);
   __ mov(ecx, edx);
   __ and_(ecx, eax);
   __ JumpIfSmi(ecx, &miss, Label::kNear);
 
+  __ GetWeakValue(edi, cell);
   __ mov(ecx, FieldOperand(eax, HeapObject::kMapOffset));
   __ mov(ebx, FieldOperand(edx, HeapObject::kMapOffset));
-  __ cmp(ecx, known_map_);
+  __ cmp(ecx, edi);
   __ j(not_equal, &miss, Label::kNear);
-  __ cmp(ebx, known_map_);
+  __ cmp(ebx, edi);
   __ j(not_equal, &miss, Label::kNear);
 
   __ sub(eax, edx);