Revert of [Atomics] code stubs for atomic operations

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/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 5921 matching lines @@
 
   const int spill_offset = 1 + kApiStackSpace;
   // +3 is to skip prolog, return address and name handle.
   MemOperand return_value_operand(
       fp, (PropertyCallbackArguments::kReturnValueOffset + 3) * kPointerSize);
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref,
                            kStackUnwindSpace, NULL, spill_offset,
                            return_value_operand, NULL);
 }
 
-namespace {
-
-void GetTypedArrayBackingStore(MacroAssembler* masm, Register backing_store,
-                               Register object, Register scratch,
-                               FPRegister double_scratch) {
-  Label offset_is_not_smi, done;
-  __ Ldr(scratch, FieldMemOperand(object, JSTypedArray::kBufferOffset));
-  __ Ldr(backing_store,
-         FieldMemOperand(scratch, JSArrayBuffer::kBackingStoreOffset));
-  __ Ldr(scratch,
-         FieldMemOperand(object, JSArrayBufferView::kByteOffsetOffset));
-  __ JumpIfNotSmi(scratch, &offset_is_not_smi);
-  // offset is smi
-  __ Add(backing_store, backing_store, Operand::UntagSmi(scratch));
-  __ B(&done);
-
-  // offset is a heap number
-  __ Bind(&offset_is_not_smi);
-  __ Ldr(double_scratch, FieldMemOperand(scratch, HeapNumber::kValueOffset));
-  __ Fcvtzu(scratch, double_scratch);
-  __ Add(backing_store, backing_store, scratch);
-  __ Bind(&done);
-}
-
-void TypedArrayJumpTable(MacroAssembler* masm, Register object,
-                         Register scratch, Register scratch2, 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);
-
-  __ Ldr(scratch, FieldMemOperand(object, JSObject::kElementsOffset));
-  __ Ldr(scratch, FieldMemOperand(scratch, HeapObject::kMapOffset));
-  __ Ldrb(scratch, FieldMemOperand(scratch, Map::kInstanceTypeOffset));
-  __ Subs(scratch, scratch,
-          Operand(static_cast<uint8_t>(FIXED_INT8_ARRAY_TYPE)));
-  __ Assert(ge, kOffsetOutOfRange);
-
-  Label abort;
-  Label table;
-
-  __ Adr(scratch2, &table);
-  __ Add(scratch, scratch2, Operand(scratch, UXTW, 2));
-  __ Br(scratch);
-
-  __ StartBlockPools();
-  __ Bind(&table);
-  __ B(i8);      // Int8Array
-  __ B(u8);      // Uint8Array
-  __ B(i16);     // Int16Array
-  __ B(u16);     // Uint16Array
-  __ B(i32);     // Int32Array
-  __ B(u32);     // Uint32Array
-  __ B(&abort);  // Float32Array
-  __ B(&abort);  // Float64Array
-  __ B(u8c);     // Uint8ClampedArray
-  __ EndBlockPools();
-
-  __ Bind(&abort);
-  __ Abort(kNoReason);
-}
-
-void ReturnUnsignedInteger32(MacroAssembler* masm, FPRegister dst,
-                             Register value, Register scratch,
-                             Register scratch2) {
-  Label not_smi, call_runtime;
-  __ Tbnz(value, 31, &not_smi);
-  __ SmiTag(x0, value);
-  __ Ret();
-
-  __ Bind(&not_smi);
-  __ Ucvtf(dst, value);
-  __ AllocateHeapNumber(x0, &call_runtime, scratch, scratch2, dst);
-  __ Ret();
-
-  __ Bind(&call_runtime);
-  {
-    FrameScope scope(masm, StackFrame::INTERNAL);
-    __ CallRuntimeSaveDoubles(Runtime::kAllocateHeapNumber);
-    __ Str(value, FieldMemOperand(x0, HeapNumber::kValueOffset));
-  }
-  __ Ret();
-}
-
-}  // anonymous namespace
-
-void AtomicsLoadStub::Generate(MacroAssembler* masm) {
-  Register object = x1;
-  Register index = x0;  // Index is an untagged word32.
-  Register backing_store = x2;
-  Label i8, u8, i16, u16, i32, u32;
-
-  GetTypedArrayBackingStore(masm, backing_store, object, x3, d0);
-  TypedArrayJumpTable(masm, object, x3, x4, &i8, &u8, &i16, &u16, &i32, &u32,
-                      &u8);
-
-  __ Bind(&i8);
-  __ Ldrsb(x0, MemOperand(backing_store, index));
-  __ Dmb(InnerShareable, BarrierAll);
-  __ SmiTag(x0);
-  __ Ret();
-
-  __ Bind(&u8);
-  __ Ldrb(x0, MemOperand(backing_store, index));
-  __ Dmb(InnerShareable, BarrierAll);
-  __ SmiTag(x0);
-  __ Ret();
-
-  __ Bind(&i16);
-  __ Ldrsh(x0, MemOperand(backing_store, index, UXTW, 1));
-  __ Dmb(InnerShareable, BarrierAll);
-  __ SmiTag(x0);
-  __ Ret();
-
-  __ Bind(&u16);
-  __ Ldrh(x0, MemOperand(backing_store, index, UXTW, 1));
-  __ Dmb(InnerShareable, BarrierAll);
-  __ SmiTag(x0);
-  __ Ret();
-
-  __ Bind(&i32);
-  __ Ldrsw(x0, MemOperand(backing_store, index, UXTW, 2));
-  __ Dmb(InnerShareable, BarrierAll);
-  DCHECK(SmiValuesAre32Bits());
-  __ SmiTag(x0);
-  __ Ret();
-
-  __ Bind(&u32);
-  __ Ldr(w0, MemOperand(backing_store, index, UXTW, 2));
-  __ Dmb(InnerShareable, BarrierAll);
-  ReturnUnsignedInteger32(masm, d0, x0, x1, x2);
-}
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64