Revert of [Atomics] code stubs for atomic operations

src/arm/code-stubs-arm.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_ARM
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 5534 matching lines @@
   ExternalReference thunk_ref =
       ExternalReference::invoke_accessor_getter_callback(isolate());
 
   // +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, return_value_operand, NULL);
 }
 
-namespace {
-
-void GetTypedArrayBackingStore(MacroAssembler* masm, Register backing_store,
-                               Register object, Register scratch,
-                               LowDwVfpRegister 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::SmiUntag(scratch));
-  __ jmp(&done);
-
-  // offset is a heap number
-  __ bind(&offset_is_not_smi);
-  __ vldr(double_scratch, scratch, HeapNumber::kValueOffset - kHeapObjectTag);
-  __ vcvt_u32_f64(double_scratch.low(), double_scratch);
-  __ vmov(scratch, double_scratch.low());
-  __ add(backing_store, backing_store, scratch);
-  __ bind(&done);
-}
-
-void TypedArrayJumpTable(MacroAssembler* masm, Register object,
-                         Register scratch, 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));
-  __ sub(scratch, scratch, Operand(static_cast<uint8_t>(FIXED_INT8_ARRAY_TYPE)),
-         SetCC);
-  __ Assert(ge, kOffsetOutOfRange);
-
-  Label abort;
-
-  {
-    Assembler::BlockConstPoolScope scope(masm);
-    __ add(pc, pc, Operand(scratch, LSL, 2));
-    __ nop();
-    __ 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
-  }
-
-  __ bind(&abort);
-  __ Abort(kNoReason);
-}
-
-void ReturnInteger32(MacroAssembler* masm, DwVfpRegister dst, Register value,
-                     SwVfpRegister single_scratch, Label* use_heap_number) {
-  Label not_smi;
-  __ TrySmiTag(r0, value, &not_smi);
-  __ Ret();
-
-  __ bind(&not_smi);
-  __ vmov(single_scratch, value);
-  __ vcvt_f64_s32(dst, single_scratch);
-  __ jmp(use_heap_number);
-}
-
-void ReturnUnsignedInteger32(MacroAssembler* masm, DwVfpRegister dst,
-                             Register value, SwVfpRegister single_scratch,
-                             Label* use_heap_number) {
-  Label not_smi;
-  __ cmp(value, Operand(0x40000000U));
-  __ b(cs, &not_smi);
-  __ SmiTag(r0, value);
-  __ Ret();
-
-  __ bind(&not_smi);
-  __ vmov(single_scratch, value);
-  __ vcvt_f64_u32(dst, single_scratch);
-  __ jmp(use_heap_number);
-}
-
-void ReturnAllocatedHeapNumber(MacroAssembler* masm, DwVfpRegister value,
-                               Register scratch, Register scratch2,
-                               Register scratch3) {
-  Label call_runtime;
-  __ LoadRoot(scratch3, Heap::kHeapNumberMapRootIndex);
-  __ AllocateHeapNumber(r0, scratch, scratch2, scratch3, &call_runtime);
-  __ vstr(value, FieldMemOperand(r0, HeapNumber::kValueOffset));
-  __ Ret();
-
-  __ bind(&call_runtime);
-  {
-    FrameScope scope(masm, StackFrame::INTERNAL);
-    __ CallRuntimeSaveDoubles(Runtime::kAllocateHeapNumber);
-    __ vstr(value, FieldMemOperand(r0, HeapNumber::kValueOffset));
-  }
-  __ Ret();
-}
-
-}  // anonymous namespace
-
-void AtomicsLoadStub::Generate(MacroAssembler* masm) {
-  Register object = r1;
-  Register index = r0;  // Index is an untagged word32.
-  Register backing_store = r2;
-  Label i8, u8, i16, u16, i32, u32;
-
-  GetTypedArrayBackingStore(masm, backing_store, object, r3, d0);
-  TypedArrayJumpTable(masm, object, r3, &i8, &u8, &i16, &u16, &i32, &u32, &u8);
-
-  __ bind(&i8);
-  __ ldrsb(r0, MemOperand(backing_store, index));
-  __ dmb(ISH);
-  __ SmiTag(r0);
-  __ Ret();
-
-  __ bind(&u8);
-  __ ldrb(r0, MemOperand(backing_store, index));
-  __ dmb(ISH);
-  __ SmiTag(r0);
-  __ Ret();
-
-  __ bind(&i16);
-  __ ldrsh(r0, MemOperand(backing_store, index, LSL, 1));
-  __ dmb(ISH);
-  __ SmiTag(r0);
-  __ Ret();
-
-  __ bind(&u16);
-  __ ldrh(r0, MemOperand(backing_store, index, LSL, 1));
-  __ dmb(ISH);
-  __ SmiTag(r0);
-  __ Ret();
-
-  Label use_heap_number;
-
-  __ bind(&i32);
-  __ ldr(r0, MemOperand(backing_store, index, LSL, 2));
-  __ dmb(ISH);
-  ReturnInteger32(masm, d0, r0, s2, &use_heap_number);
-
-  __ bind(&u32);
-  __ ldr(r0, MemOperand(backing_store, index, LSL, 2));
-  __ dmb(ISH);
-  ReturnUnsignedInteger32(masm, d0, r0, s2, &use_heap_number);
-
-  __ bind(&use_heap_number);
-  ReturnAllocatedHeapNumber(masm, d0, r1, r2, r3);
-}
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM