Make BitField3 a raw uint32 field, and move to the start of the map.

BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/272163002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21225 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/full-codegen-arm.cc

@@ -3047,7 +3047,7 @@ void FullCodeGenerator::EmitIsStringWrapperSafeForDefaultValueOf(
   __ add(r4, r4, Operand(DescriptorArray::kFirstOffset - kHeapObjectTag));
   // Calculate the end of the descriptor array.
   __ mov(r2, r4);
-  __ add(r2, r2, Operand::PointerOffsetFromSmiKey(r3));
+  __ add(r2, r2, Operand(r3, LSL, kPointerSizeLog2));
 
   // Loop through all the keys in the descriptor array. If one of these is the
   // string "valueOf" the result is false.

src/arm/macro-assembler-arm.cc

@@ -3596,7 +3596,7 @@ void MacroAssembler::CheckMapDeprecated(Handle<Map> map,
   if (map->CanBeDeprecated()) {
     mov(scratch, Operand(map));
     ldr(scratch, FieldMemOperand(scratch, Map::kBitField3Offset));
-    tst(scratch, Operand(Smi::FromInt(Map::Deprecated::kMask)));
+    tst(scratch, Operand(Map::Deprecated::kMask));
     b(ne, if_deprecated);
   }
 }
@@ -3854,7 +3854,8 @@ void MacroAssembler::NumberOfOwnDescriptors(Register dst, Register map) {
 void MacroAssembler::EnumLength(Register dst, Register map) {
   STATIC_ASSERT(Map::EnumLengthBits::kShift == 0);
   ldr(dst, FieldMemOperand(map, Map::kBitField3Offset));
-  and_(dst, dst, Operand(Smi::FromInt(Map::EnumLengthBits::kMask)));
+  and_(dst, dst, Operand(Map::EnumLengthBits::kMask));
+  SmiTag(dst);
 }
 
 

src/arm/macro-assembler-arm.h

@@ -1357,7 +1357,7 @@ class MacroAssembler: public Assembler {
   template<typename Field>
   void DecodeField(Register reg) {
     static const int shift = Field::kShift;
-    static const int mask = (Field::kMask >> shift) << kSmiTagSize;
+    static const int mask = Field::kMask >> shift;
     mov(reg, Operand(reg, LSR, shift));
     and_(reg, reg, Operand(mask));
   }

src/arm64/macro-assembler-arm64.cc

@@ -1325,15 +1325,14 @@ void MacroAssembler::NumberOfOwnDescriptors(Register dst, Register map) {
 
 void MacroAssembler::EnumLengthUntagged(Register dst, Register map) {
   STATIC_ASSERT(Map::EnumLengthBits::kShift == 0);
-  Ldrsw(dst, UntagSmiFieldMemOperand(map, Map::kBitField3Offset));
+  Ldrsw(dst, FieldMemOperand(map, Map::kBitField3Offset));
   And(dst, dst, Map::EnumLengthBits::kMask);
 }
 
 
 void MacroAssembler::EnumLengthSmi(Register dst, Register map) {
-  STATIC_ASSERT(Map::EnumLengthBits::kShift == 0);
+  EnumLengthUntagged(dst, map);
-  Ldr(dst, FieldMemOperand(map, Map::kBitField3Offset));
+  SmiTag(dst, dst);
-  And(dst, dst, Smi::FromInt(Map::EnumLengthBits::kMask));
 }
 
 
@@ -4515,7 +4514,7 @@ void MacroAssembler::CheckMapDeprecated(Handle<Map> map,
                                         Label* if_deprecated) {
   if (map->CanBeDeprecated()) {
     Mov(scratch, Operand(map));
-    Ldrsw(scratch, UntagSmiFieldMemOperand(scratch, Map::kBitField3Offset));
+    Ldrsw(scratch, FieldMemOperand(scratch, Map::kBitField3Offset));
     TestAndBranchIfAnySet(scratch, Map::Deprecated::kMask, if_deprecated);
   }
 }

src/arm64/macro-assembler-arm64.h

@@ -843,7 +843,7 @@ class MacroAssembler : public Assembler {
 
   template<typename Field>
   void DecodeField(Register reg) {
-    static const uint64_t shift = Field::kShift + kSmiShift;
+    static const uint64_t shift = Field::kShift;
     static const uint64_t setbits = CountSetBits(Field::kMask, 32);
     Ubfx(reg, reg, shift, setbits);
   }

src/ia32/full-codegen-ia32.cc

@@ -2986,7 +2986,7 @@ void FullCodeGenerator::EmitIsStringWrapperSafeForDefaultValueOf(
   STATIC_ASSERT(kSmiTagSize == 1);
   STATIC_ASSERT(kPointerSize == 4);
   __ imul(ecx, ecx, DescriptorArray::kDescriptorSize);
-  __ lea(ecx, Operand(ebx, ecx, times_2, DescriptorArray::kFirstOffset));
+  __ lea(ecx, Operand(ebx, ecx, times_4, DescriptorArray::kFirstOffset));
   // Calculate location of the first key name.
   __ add(ebx, Immediate(DescriptorArray::kFirstOffset));
   // Loop through all the keys in the descriptor array. If one of these is the

src/ia32/macro-assembler-ia32.cc

@@ -3182,7 +3182,7 @@ void MacroAssembler::CheckMapDeprecated(Handle<Map> map,
   if (map->CanBeDeprecated()) {
     mov(scratch, map);
     mov(scratch, FieldOperand(scratch, Map::kBitField3Offset));
-    and_(scratch, Immediate(Smi::FromInt(Map::Deprecated::kMask)));
+    and_(scratch, Immediate(Map::Deprecated::kMask));
     j(not_zero, if_deprecated);
   }
 }
@@ -3360,7 +3360,8 @@ void MacroAssembler::EnsureNotWhite(
 void MacroAssembler::EnumLength(Register dst, Register map) {
   STATIC_ASSERT(Map::EnumLengthBits::kShift == 0);
   mov(dst, FieldOperand(map, Map::kBitField3Offset));
-  and_(dst, Immediate(Smi::FromInt(Map::EnumLengthBits::kMask)));
+  and_(dst, Immediate(Map::EnumLengthBits::kMask));
+  SmiTag(dst);
 }
 
 

src/ia32/macro-assembler-ia32.h

@@ -495,7 +495,7 @@ class MacroAssembler: public Assembler {
   template<typename Field>
   void DecodeField(Register reg) {
     static const int shift = Field::kShift;
-    static const int mask = (Field::kMask >> Field::kShift) << kSmiTagSize;
+    static const int mask = Field::kMask >> Field::kShift;
     sar(reg, shift);
     and_(reg, Immediate(mask));
   }

src/objects-inl.h

@@ -4753,16 +4753,15 @@ ACCESSORS(Map, instance_descriptors, DescriptorArray, kDescriptorsOffset)
 
 
 void Map::set_bit_field3(uint32_t bits) {
-  // Ensure the upper 2 bits have the same value by sign extending it. This is
+  if (kInt32Size != kPointerSize) {
-  // necessary to be able to use the 31st bit.
+    WRITE_UINT32_FIELD(this, kBitField3Offset + kInt32Size, 0);
-  int value = bits << 1;
+  }
-  WRITE_FIELD(this, kBitField3Offset, Smi::FromInt(value >> 1));
+  WRITE_UINT32_FIELD(this, kBitField3Offset, bits);
 }
 
 
 uint32_t Map::bit_field3() {
-  Object* value = READ_FIELD(this, kBitField3Offset);
+  return READ_UINT32_FIELD(this, kBitField3Offset);
-  return Smi::cast(value)->value();
 }
 
 

src/objects.h

@@ -6481,7 +6481,8 @@ class Map: public HeapObject {
   // Layout description.
   static const int kInstanceSizesOffset = HeapObject::kHeaderSize;
   static const int kInstanceAttributesOffset = kInstanceSizesOffset + kIntSize;
-  static const int kPrototypeOffset = kInstanceAttributesOffset + kIntSize;
+  static const int kBitField3Offset = kInstanceAttributesOffset + kIntSize;
+  static const int kPrototypeOffset = kBitField3Offset + kPointerSize;
   static const int kConstructorOffset = kPrototypeOffset + kPointerSize;
   // Storage for the transition array is overloaded to directly contain a back
   // pointer if unused. When the map has transitions, the back pointer is
@@ -6493,13 +6494,12 @@ class Map: public HeapObject {
       kTransitionsOrBackPointerOffset + kPointerSize;
   static const int kCodeCacheOffset = kDescriptorsOffset + kPointerSize;
   static const int kDependentCodeOffset = kCodeCacheOffset + kPointerSize;
-  static const int kBitField3Offset = kDependentCodeOffset + kPointerSize;
+  static const int kSize = kDependentCodeOffset + kPointerSize;
-  static const int kSize = kBitField3Offset + kPointerSize;
 
   // Layout of pointer fields. Heap iteration code relies on them
   // being continuously allocated.
   static const int kPointerFieldsBeginOffset = Map::kPrototypeOffset;
-  static const int kPointerFieldsEndOffset = kBitField3Offset + kPointerSize;
+  static const int kPointerFieldsEndOffset = kSize;
 
   // Byte offsets within kInstanceSizesOffset.
   static const int kInstanceSizeOffset = kInstanceSizesOffset + 0;

src/x64/full-codegen-x64.cc

@@ -2976,11 +2976,8 @@ void FullCodeGenerator::EmitIsStringWrapperSafeForDefaultValueOf(
   // rbx: descriptor array.
   // rcx: valid entries in the descriptor array.
   // Calculate the end of the descriptor array.
-  __ imulp(rcx, rcx, Immediate(DescriptorArray::kDescriptorSize));
+  __ imull(rcx, rcx, Immediate(DescriptorArray::kDescriptorSize));
-  SmiIndex index = masm_->SmiToIndex(rdx, rcx, kPointerSizeLog2);
+  __ leal(rcx, Operand(r8, rcx, times_4, DescriptorArray::kFirstOffset));
-  __ leap(rcx,
-         Operand(
-             r8, index.reg, index.scale, DescriptorArray::kFirstOffset));
   // Calculate location of the first key name.
   __ addp(r8, Immediate(DescriptorArray::kFirstOffset));
   // Loop through all the keys in the descriptor array. If one of these is the

src/x64/macro-assembler-x64.cc

@@ -3484,16 +3484,16 @@ void MacroAssembler::LoadInstanceDescriptors(Register map,
 
 
 void MacroAssembler::NumberOfOwnDescriptors(Register dst, Register map) {
-  movp(dst, FieldOperand(map, Map::kBitField3Offset));
+  movl(dst, FieldOperand(map, Map::kBitField3Offset));
   DecodeField<Map::NumberOfOwnDescriptorsBits>(dst);
 }
 
 
 void MacroAssembler::EnumLength(Register dst, Register map) {
   STATIC_ASSERT(Map::EnumLengthBits::kShift == 0);
-  movp(dst, FieldOperand(map, Map::kBitField3Offset));
+  movl(dst, FieldOperand(map, Map::kBitField3Offset));
-  Move(kScratchRegister, Smi::FromInt(Map::EnumLengthBits::kMask));
+  andl(dst, Immediate(Map::EnumLengthBits::kMask));
-  andp(dst, kScratchRegister);
+  Integer32ToSmi(dst, dst);
 }
 
 
@@ -4959,9 +4959,8 @@ void MacroAssembler::CheckMapDeprecated(Handle<Map> map,
                                         Label* if_deprecated) {
   if (map->CanBeDeprecated()) {
     Move(scratch, map);
-    movp(scratch, FieldOperand(scratch, Map::kBitField3Offset));
+    movl(scratch, FieldOperand(scratch, Map::kBitField3Offset));
-    SmiToInteger32(scratch, scratch);
+    andl(scratch, Immediate(Map::Deprecated::kMask));
-    andp(scratch, Immediate(Map::Deprecated::kMask));
     j(not_zero, if_deprecated);
   }
 }

src/x64/macro-assembler-x64.h

@@ -1011,11 +1011,10 @@ class MacroAssembler: public Assembler {
 
   template<typename Field>
   void DecodeField(Register reg) {
-    static const int shift = Field::kShift + kSmiShift;
+    static const int shift = Field::kShift;
     static const int mask = Field::kMask >> Field::kShift;
-    shrp(reg, Immediate(shift));
+    shrl(reg, Immediate(shift));
-    andp(reg, Immediate(mask));
+    andl(reg, Immediate(mask));
-    shlp(reg, Immediate(kSmiShift));
   }
 
   // Abort execution if argument is not a number, enabled via --debug-code.