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Unified Diff: src/arm64/code-stubs-arm64.cc

Issue 1881383003: [Atomics] code stubs for atomic operations (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: fix unused function Created 4 years, 8 months ago
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Index: src/arm64/code-stubs-arm64.cc
diff --git a/src/arm64/code-stubs-arm64.cc b/src/arm64/code-stubs-arm64.cc
index f0265c73cee09edb9d889b803cf853f73edcc0fd..13438cfadeb37aa37ff9ecb7d987726a2cdd92fc 100644
--- a/src/arm64/code-stubs-arm64.cc
+++ b/src/arm64/code-stubs-arm64.cc
@@ -5939,6 +5939,144 @@ void CallApiGetterStub::Generate(MacroAssembler* masm) {
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 __
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