[csa] Add IsNumber and IsNumberNormalized predicates

src/code-stub-assembler.cc

 // Copyright 2016 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/code-stub-assembler.h"
 #include "src/code-factory.h"
 #include "src/frames-inl.h"
 #include "src/frames.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 3134 matching lines @@
       Int32GreaterThanOrEqual(instance_type,
                               Int32Constant(FIRST_FIXED_TYPED_ARRAY_TYPE)),
       Int32LessThanOrEqual(instance_type,
                            Int32Constant(LAST_FIXED_TYPED_ARRAY_TYPE)));
 }
 
 Node* CodeStubAssembler::IsJSRegExp(Node* object) {
   return HasInstanceType(object, JS_REGEXP_TYPE);
 }
 
+Node* CodeStubAssembler::IsNumber(Node* object) {
+  return Select(TaggedIsSmi(object), [=] { return Int32Constant(1); },
+                [=] { return IsHeapNumber(object); },
+                MachineRepresentation::kWord32);
+}
+
+Node* CodeStubAssembler::IsNumberNormalized(Node* number) {
+  CSA_ASSERT(this, IsNumber(number));
+
+  VARIABLE(var_result, MachineRepresentation::kWord32, Int32Constant(1));
+  Label out(this);
+
+  GotoIf(TaggedIsSmi(number), &out);
+
+  Node* const value = LoadHeapNumberValue(number);
+  Node* const smi_min = Float64Constant(static_cast<double>(Smi::kMinValue));
+  Node* const smi_max = Float64Constant(static_cast<double>(Smi::kMaxValue));
+
+  GotoIf(Float64LessThan(value, smi_min), &out);
+  GotoIf(Float64GreaterThan(value, smi_max), &out);
+  GotoIfNot(Float64Equal(value, value), &out);  // NaN.
+
+  var_result.Bind(Int32Constant(0));
+  Goto(&out);
+
+  BIND(&out);
+  return var_result.value();
+}
+
 Node* CodeStubAssembler::StringCharCodeAt(Node* string, Node* index,
                                           ParameterMode parameter_mode) {
   CSA_ASSERT(this, IsString(string));
 
   // Translate the {index} into a Word.
   Node* const int_index = ParameterToWord(index, parameter_mode);
 
   VARIABLE(var_result, MachineRepresentation::kWord32);
 
   Label out(this, &var_result), runtime_generic(this), runtime_external(this);
@@ skipping 5344 matching lines @@
         formatted.c_str(), TENURED);
     CallRuntime(Runtime::kGlobalPrint, NoContextConstant(),
                 HeapConstant(string));
   }
   CallRuntime(Runtime::kDebugPrint, NoContextConstant(), tagged_value);
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8