Improve range analysis for modulo operations.

src/utils.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 214 matching lines @@
 }
 
 
 // Returns the minimum of the two parameters.
 template <typename T>
 T Min(T a, T b) {
   return a < b ? a : b;
 }
 
 
+// Returns the negative absolute value of its argument.
+template <typename T>
+T NegAbs(T a) {
+  return a < 0 ? a : -a;
+}
+
+
 inline int StrLength(const char* string) {
   size_t length = strlen(string);
   ASSERT(length == static_cast<size_t>(static_cast<int>(length)));
   return static_cast<int>(length);
 }
 
 
 // ----------------------------------------------------------------------------
 // BitField is a help template for encoding and decode bitfield with
 // unsigned content.
@@ skipping 857 matching lines @@
 
   // Every compiled stub starts with this id.
   static const int kStubEntryId = 5;
 
   int id_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_UTILS_H_