X87: [Atomics] code stubs for atomic operations.

  port 5e9ddf6c (r35453)

  original commit message:
  Reland of (https://codereview.chromium.org/1617503003)

  * New atomic code stubs for x64, ia32, arm, arm64
  * Add convenience functions JumpIfNotValidSmiValue, JumpIfUintNotValidSmiValue
    to macro-assembler-ia32 (API based on x64 macro assembler)
  * Remove runtime implementation of Atomics.load, the code stub should always be
    called instead
  * Add new test to mjsunit atomics test; check that Smi values of different
    sizes are supported when possible, else fall back to HeapNumbers

  These changes were needed to add another codestub:
  * Bump kStubMajorKeyBits from 7 to 8
  * Reduce ScriptContextFieldStub::kSlotIndexBits from 13 to 12

BUG=

Review URL: https://codereview.chromium.org/1894923002

Cr-Commit-Position: refs/heads/master@{#35560}

src/x87/code-stubs-x87.cc

@@ -5507,6 +5507,196 @@ void CallApiGetterStub::Generate(MacroAssembler* masm) {
                            return_value_operand, NULL);
 }
 
+namespace {
+
+void GetTypedArrayBackingStore(MacroAssembler* masm, Register backing_store,
+                               Register object, Register scratch) {
+  Label offset_is_not_smi, done;
+  __ mov(scratch, FieldOperand(object, JSTypedArray::kBufferOffset));
+  __ mov(backing_store,
+         FieldOperand(scratch, JSArrayBuffer::kBackingStoreOffset));
+
+  __ mov(scratch, FieldOperand(object, JSArrayBufferView::kByteOffsetOffset));
+  __ JumpIfNotSmi(scratch, &offset_is_not_smi, Label::kNear);
+  // Offset is smi.
+  __ SmiUntag(scratch);
+  __ add(backing_store, scratch);
+  __ jmp(&done, Label::kNear);
+
+  // Offset is a heap number.
+  __ bind(&offset_is_not_smi);
+  //  __ movsd(xmm0, FieldOperand(scratch, HeapNumber::kValueOffset));
+  __ fld_d(FieldOperand(scratch, HeapNumber::kValueOffset));
+  //  __ cvttsd2si(scratch, xmm0);
+  __ TruncateX87TOSToI(scratch);
+  __ add(backing_store, scratch);
+  __ bind(&done);
+}
+
+void TypedArrayJumpTablePrologue(MacroAssembler* masm, Register object,
+                                 Register scratch, Register scratch2,
+                                 Label* table) {
+  __ mov(scratch, FieldOperand(object, JSObject::kElementsOffset));
+  __ mov(scratch, FieldOperand(scratch, HeapObject::kMapOffset));
+  __ movzx_b(scratch, FieldOperand(scratch, Map::kInstanceTypeOffset));
+  __ sub(scratch, Immediate(static_cast<uint8_t>(FIXED_INT8_ARRAY_TYPE)));
+  __ Assert(above_equal, kOffsetOutOfRange);
+  __ jmp(Operand::JumpTable(scratch, times_4, table));
+}
+
+void TypedArrayJumpTableEpilogue(MacroAssembler* masm, Label* table, Label* i8,
+                                 Label* u8, Label* i16, Label* u16, Label* i32,
+                                 Label* u32, Label* u8c) {
+  STATIC_ASSERT(FIXED_UINT8_ARRAY_TYPE == FIXED_INT8_ARRAY_TYPE + 1);
+  STATIC_ASSERT(FIXED_INT16_ARRAY_TYPE == FIXED_INT8_ARRAY_TYPE + 2);
+  STATIC_ASSERT(FIXED_UINT16_ARRAY_TYPE == FIXED_INT8_ARRAY_TYPE + 3);
+  STATIC_ASSERT(FIXED_INT32_ARRAY_TYPE == FIXED_INT8_ARRAY_TYPE + 4);
+  STATIC_ASSERT(FIXED_UINT32_ARRAY_TYPE == FIXED_INT8_ARRAY_TYPE + 5);
+  STATIC_ASSERT(FIXED_FLOAT32_ARRAY_TYPE == FIXED_INT8_ARRAY_TYPE + 6);
+  STATIC_ASSERT(FIXED_FLOAT64_ARRAY_TYPE == FIXED_INT8_ARRAY_TYPE + 7);
+  STATIC_ASSERT(FIXED_UINT8_CLAMPED_ARRAY_TYPE == FIXED_INT8_ARRAY_TYPE + 8);
+
+  Label abort;
+  __ bind(table);
+  __ dd(i8);      // Int8Array
+  __ dd(u8);      // Uint8Array
+  __ dd(i16);     // Int16Array
+  __ dd(u16);     // Uint16Array
+  __ dd(i32);     // Int32Array
+  __ dd(u32);     // Uint32Array
+  __ dd(&abort);  // Float32Array
+  __ dd(&abort);  // Float64Array
+  __ dd(u8c);     // Uint8ClampedArray
+
+  __ bind(&abort);
+  __ Abort(kNoReason);
+}
+
+void ReturnInteger32(MacroAssembler* masm, X87Register dst, Register value,
+                     Register scratch, Label* use_heap_number) {
+  Label not_smi;
+  if (!value.is(eax)) {
+    __ mov(eax, value);
+  }
+  __ JumpIfNotValidSmiValue(eax, scratch, &not_smi, Label::kNear);
+  __ SmiTag(eax);
+  __ Ret();
+
+  __ bind(&not_smi);
+  //  __ Cvtsi2sd(dst, eax);
+  __ push(eax);
+  __ fld_s(MemOperand(esp, 0));
+  __ pop(eax);
+  __ jmp(use_heap_number);
+}
+
+void ReturnUnsignedInteger32(MacroAssembler* masm, X87Register dst,
+                             Register value, X87Register scratch,
+                             Label* use_heap_number) {
+  Label not_smi;
+  if (!value.is(eax)) {
+    __ mov(eax, value);
+  }
+  __ JumpIfUIntNotValidSmiValue(eax, &not_smi, Label::kNear);
+  __ SmiTag(eax);
+  __ Ret();
+
+  __ bind(&not_smi);
+  // Convert [0, 2**32-1] -> [-2**31, 2**31-1].
+  __ add(eax, Immediate(-0x7fffffff - 1));  // -0x80000000 parses incorrectly.
+  // __ Cvtsi2sd(dst, eax);
+  __ push(eax);
+  __ fld_s(MemOperand(esp, 0));
+  __ pop(eax);
+
+  __ mov(eax, Immediate(0x4f000000));  // 2**31 as IEEE float
+  // __ movd(scratch, eax);
+  __ push(eax);
+  __ fld_s(MemOperand(esp, 0));
+  __ pop(eax);
+
+  // __ cvtss2sd(scratch, scratch);
+  __ sub(esp, Immediate(kDoubleSize));
+  __ fstp_s(MemOperand(esp, 0));
+  __ fld_s(MemOperand(esp, 0));
+  __ add(esp, Immediate(kDoubleSize));
+
+  // __ addsd(dst, scratch);
+  __ faddp();
+  __ jmp(use_heap_number);
+}
+
+void ReturnAllocatedHeapNumber(MacroAssembler* masm, X87Register value,
+                               Register scratch, Register scratch2) {
+  Label call_runtime;
+  __ AllocateHeapNumber(eax, scratch, scratch2, &call_runtime);
+  // __ movsd(FieldOperand(eax, HeapNumber::kValueOffset), value);
+  __ fst_d(FieldOperand(eax, HeapNumber::kValueOffset));
+  __ Ret();
+
+  __ bind(&call_runtime);
+  {
+    FrameScope scope(masm, StackFrame::INTERNAL);
+    __ CallRuntimeSaveDoubles(Runtime::kAllocateHeapNumber);
+    // __ movsd(FieldOperand(eax, HeapNumber::kValueOffset), value);
+    __ fst_d(FieldOperand(eax, HeapNumber::kValueOffset));
+  }
+  __ Ret();
+}
+
+}  // anonymous namespace
+
+void AtomicsLoadStub::Generate(MacroAssembler* masm) {
+  Register object = edx;
+  Register index = eax;  // Index is an untagged word32.
+  Register backing_store = ebx;
+  Label table;
+
+  GetTypedArrayBackingStore(masm, backing_store, object, ecx);
+  TypedArrayJumpTablePrologue(masm, object, ecx, esi, &table);
+
+  Label i8, u8, i16, u16, i32, u32;
+
+  __ bind(&i8);
+  __ mov_b(eax, Operand(backing_store, index, times_1, 0));
+  __ movsx_b(eax, eax);
+  __ SmiTag(eax);
+  __ Ret();
+
+  __ bind(&u8);
+  __ mov_b(eax, Operand(backing_store, index, times_1, 0));
+  __ movzx_b(eax, eax);
+  __ SmiTag(eax);
+  __ Ret();
+
+  __ bind(&i16);
+  __ mov_w(eax, Operand(backing_store, index, times_2, 0));
+  __ movsx_w(eax, eax);
+  __ SmiTag(eax);
+  __ Ret();
+
+  __ bind(&u16);
+  __ mov_w(eax, Operand(backing_store, index, times_2, 0));
+  __ movzx_w(eax, eax);
+  __ SmiTag(eax);
+  __ Ret();
+
+  Label use_heap_number;
+
+  __ bind(&i32);
+  __ mov(eax, Operand(backing_store, index, times_4, 0));
+  ReturnInteger32(masm, stX_0, eax, ecx, &use_heap_number);
+
+  __ bind(&u32);
+  __ mov(eax, Operand(backing_store, index, times_4, 0));
+  ReturnUnsignedInteger32(masm, stX_0, eax, stX_1, &use_heap_number);
+
+  __ bind(&use_heap_number);
+  ReturnAllocatedHeapNumber(masm, stX_0, ecx, edx);
+
+  TypedArrayJumpTableEpilogue(masm, &table, &i8, &u8, &i16, &u16, &i32, &u32,
+                              &u8);
+}
 
 #undef __
 

src/x87/interface-descriptors-x87.cc

@@ -427,6 +427,15 @@ void ResumeGeneratorDescriptor::InitializePlatformSpecific(
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
+void AtomicsLoadDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {
+      edx,  // the typedarray object
+      eax   // the index to load (untagged)
+  };
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
 }  // namespace internal
 }  // namespace v8
 

src/x87/macro-assembler-x87.h

@@ -500,6 +500,23 @@ class MacroAssembler: public Assembler {
     j(not_zero, not_smi_label, distance);
   }
 
+  // Jump if the value cannot be represented by a smi.
+  inline void JumpIfNotValidSmiValue(Register value, Register scratch,
+                                     Label* on_invalid,
+                                     Label::Distance distance = Label::kFar) {
+    mov(scratch, value);
+    add(scratch, Immediate(0x40000000U));
+    j(sign, on_invalid, distance);
+  }
+
+  // Jump if the unsigned integer value cannot be represented by a smi.
+  inline void JumpIfUIntNotValidSmiValue(
+      Register value, Label* on_invalid,
+      Label::Distance distance = Label::kFar) {
+    cmp(value, Immediate(0x40000000U));
+    j(above_equal, on_invalid, distance);
+  }
+
   void LoadInstanceDescriptors(Register map, Register descriptors);
   void EnumLength(Register dst, Register map);
   void NumberOfOwnDescriptors(Register dst, Register map);