[turbofan] Introduce CheckedInt32Div and CheckedInt32Mod operators.

src/code-stubs.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.
 
 #include "src/code-stubs.h"
 
 #include <sstream>
 
 #include "src/bootstrapper.h"
 #include "src/code-factory.h"
@@ skipping 1414 matching lines @@
 
 // static
 compiler::Node* ModulusStub::Generate(CodeStubAssembler* assembler,
                                       compiler::Node* left,
                                       compiler::Node* right,
                                       compiler::Node* context) {
   using compiler::Node;
   typedef CodeStubAssembler::Label Label;
   typedef CodeStubAssembler::Variable Variable;
 
+  Variable var_result(assembler, MachineRepresentation::kTagged);
+  Label return_result(assembler, &var_result);
+
   // Shared entry point for floating point modulus.
   Label do_fmod(assembler);
   Variable var_dividend_float64(assembler, MachineRepresentation::kFloat64),
       var_divisor_float64(assembler, MachineRepresentation::kFloat64);
 
   Node* number_map = assembler->HeapNumberMapConstant();
 
   // We might need to loop one or two times due to ToNumber conversions.
   Variable var_dividend(assembler, MachineRepresentation::kTagged),
       var_divisor(assembler, MachineRepresentation::kTagged);
@@ skipping 13 matching lines @@
 
     assembler->Bind(&dividend_is_smi);
     {
       Label dividend_is_not_zero(assembler);
       Label divisor_is_smi(assembler), divisor_is_not_smi(assembler);
       assembler->Branch(assembler->WordIsSmi(divisor), &divisor_is_smi,
                         &divisor_is_not_smi);
 
       assembler->Bind(&divisor_is_smi);
       {
-        var_dividend_float64.Bind(assembler->SmiToFloat64(dividend));
-        var_divisor_float64.Bind(assembler->SmiToFloat64(divisor));
-        assembler->Goto(&do_fmod);
+        // Compute the modulus of two Smis.
+        var_result.Bind(assembler->SmiMod(dividend, divisor));
+        assembler->Goto(&return_result);
       }
 
       assembler->Bind(&divisor_is_not_smi);
       {
         Node* divisor_map = assembler->LoadMap(divisor);
 
         // Check if {divisor} is a HeapNumber.
         Label divisor_is_number(assembler),
             divisor_is_not_number(assembler, Label::kDeferred);
         assembler->Branch(assembler->WordEqual(divisor_map, number_map),
@@ skipping 83 matching lines @@
         var_dividend.Bind(assembler->CallStub(callable, context, dividend));
         assembler->Goto(&loop);
       }
     }
   }
 
   assembler->Bind(&do_fmod);
   {
     Node* value = assembler->Float64Mod(var_dividend_float64.value(),
                                         var_divisor_float64.value());
-    Node* result = assembler->ChangeFloat64ToTagged(value);
-    return result;
+    var_result.Bind(assembler->ChangeFloat64ToTagged(value));
+    assembler->Goto(&return_result);
   }
+
+  assembler->Bind(&return_result);
+  return var_result.value();
 }
 
 // static
 compiler::Node* ShiftLeftStub::Generate(CodeStubAssembler* assembler,
                                         compiler::Node* left,
                                         compiler::Node* right,
                                         compiler::Node* context) {
   using compiler::Node;
 
   Node* lhs_value = assembler->TruncateTaggedToWord32(context, left);
@@ skipping 3337 matching lines @@
   if (type->Is(Type::UntaggedPointer())) {
     return Representation::External();
   }
 
   DCHECK(!type->Is(Type::Untagged()));
   return Representation::Tagged();
 }
 
 }  // namespace internal
 }  // namespace v8