[turbofan] Lower NumberModulus to Uint32Mod if both inputs are Unsigned32.

src/compiler/simplified-lowering.cc

 // Copyright 2014 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/compiler/simplified-lowering.h"
 
 #include <limits>
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 492 matching lines @@
 
   bool CanObserveNonInt32(MachineTypeUnion use) {
     return (use & (kTypeUint32 | kTypeNumber | kTypeAny)) != 0;
   }
 
   bool CanObserveMinusZero(MachineTypeUnion use) {
     // TODO(turbofan): technically Uint32 cannot observe minus zero either.
     return (use & (kTypeUint32 | kTypeNumber | kTypeAny)) != 0;
   }
 
+  bool CanObserveNaN(MachineTypeUnion use) {
+    return (use & (kTypeNumber | kTypeAny)) != 0;
+  }
+
   bool CanObserveNonUint32(MachineTypeUnion use) {
     return (use & (kTypeInt32 | kTypeNumber | kTypeAny)) != 0;
   }
 
   // Dispatching routine for visiting the node {node} with the usage {use}.
   // Depending on the operator, propagate new usage info to the inputs.
   void VisitNode(Node* node, MachineTypeUnion use,
                  SimplifiedLowering* lowering) {
     switch (node->opcode()) {
       //------------------------------------------------------------------
@@ skipping 177 matching lines @@
         if (lower()) node->set_op(Float64Op(node));
         break;
       }
       case IrOpcode::kNumberModulus: {
         if (CanLowerToInt32Binop(node, use)) {
           // => signed Int32Mod
           VisitInt32Binop(node);
           if (lower()) DeferReplacement(node, lowering->Int32Mod(node));
           break;
         }
-        if (CanLowerToUint32Binop(node, use)) {
+        if (BothInputsAre(node, Type::Unsigned32()) && !CanObserveNaN(use)) {
           // => unsigned Uint32Mod
           VisitUint32Binop(node);
           if (lower()) DeferReplacement(node, lowering->Uint32Mod(node));
           break;
         }
         // => Float64Mod
         VisitFloat64Binop(node);
         if (lower()) node->set_op(Float64Op(node));
         break;
       }
@@ skipping 799 matching lines @@
 
 void SimplifiedLowering::DoStringLessThanOrEqual(Node* node) {
   node->set_op(machine()->IntLessThanOrEqual());
   node->ReplaceInput(0, StringComparison(node, true));
   node->ReplaceInput(1, jsgraph()->SmiConstant(EQUAL));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8