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// Copyright 2017 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.
#include "src/builtins/builtins-utils-gen.h"
#include "src/builtins/builtins.h"
#include "src/codegen/code-stub-assembler.h"
namespace v8 {
namespace internal {
// ES #sec-isfinite-number
TF_BUILTIN(GlobalIsFinite, CodeStubAssembler) {
Node* context = Parameter(Descriptor::kContext);
Label return_true(this), return_false(this);
// We might need to loop once for ToNumber conversion.
VARIABLE(var_num, MachineRepresentation::kTagged);
Label loop(this, &var_num);
var_num.Bind(Parameter(Descriptor::kNumber));
Goto(&loop);
BIND(&loop);
{
Node* num = var_num.value();
// Check if {num} is a Smi or a HeapObject.
GotoIf(TaggedIsSmi(num), &return_true);
// Check if {num} is a HeapNumber.
Label if_numisheapnumber(this),
if_numisnotheapnumber(this, Label::kDeferred);
Branch(IsHeapNumber(num), &if_numisheapnumber, &if_numisnotheapnumber);
BIND(&if_numisheapnumber);
{
// Check if {num} contains a finite, non-NaN value.
Node* num_value = LoadHeapNumberValue(num);
BranchIfFloat64IsNaN(Float64Sub(num_value, num_value), &return_false,
&return_true);
}
BIND(&if_numisnotheapnumber);
{
// Need to convert {num} to a Number first.
var_num.Bind(CallBuiltin(Builtins::kNonNumberToNumber, context, num));
Goto(&loop);
}
}
BIND(&return_true);
Return(TrueConstant());
BIND(&return_false);
Return(FalseConstant());
}
// ES6 #sec-isnan-number
TF_BUILTIN(GlobalIsNaN, CodeStubAssembler) {
Node* context = Parameter(Descriptor::kContext);
Label return_true(this), return_false(this);
// We might need to loop once for ToNumber conversion.
VARIABLE(var_num, MachineRepresentation::kTagged);
Label loop(this, &var_num);
var_num.Bind(Parameter(Descriptor::kNumber));
Goto(&loop);
BIND(&loop);
{
Node* num = var_num.value();
// Check if {num} is a Smi or a HeapObject.
GotoIf(TaggedIsSmi(num), &return_false);
// Check if {num} is a HeapNumber.
Label if_numisheapnumber(this),
if_numisnotheapnumber(this, Label::kDeferred);
Branch(IsHeapNumber(num), &if_numisheapnumber, &if_numisnotheapnumber);
BIND(&if_numisheapnumber);
{
// Check if {num} contains a NaN.
Node* num_value = LoadHeapNumberValue(num);
BranchIfFloat64IsNaN(num_value, &return_true, &return_false);
}
BIND(&if_numisnotheapnumber);
{
// Need to convert {num} to a Number first.
var_num.Bind(CallBuiltin(Builtins::kNonNumberToNumber, context, num));
Goto(&loop);
}
}
BIND(&return_true);
Return(TrueConstant());
BIND(&return_false);
Return(FalseConstant());
}
} // namespace internal
} // namespace v8
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