Some Utf8Length microoptimizations

src/unicode-inl.h

 // Copyright 2007-2010 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 77 matching lines @@
       return 0xb5;
     // This is an uppercase of a Latin-1 character
     // outside of Latin-1.
     case 0x178:
       return 0xff;
   }
   return 0;
 }
 
 
+unsigned Utf8::EncodeOneByte(char* str, uint8_t c) {
+  static const int kMask = ~(1 << 6);
+  if (c <= kMaxOneByteChar) {
+    str[0] = c;
+    return 1;
+  }
+  str[0] = 0xC0 | (c >> 6);
+  str[1] = 0x80 | (c & kMask);
+  return 2;
+}
+
+
 unsigned Utf8::Encode(char* str, uchar c, int previous) {
   static const int kMask = ~(1 << 6);
   if (c <= kMaxOneByteChar) {
     str[0] = c;
     return 1;
   } else if (c <= kMaxTwoByteChar) {
     str[0] = 0xC0 | (c >> 6);
     str[1] = 0x80 | (c & kMask);
     return 2;
   } else if (c <= kMaxThreeByteChar) {
@@ skipping 88 matching lines @@
   // Copy the rest the slow way.
   WriteUtf16Slow(unbuffered_start_,
                  data + buffer_length,
                  length - buffer_length);
   return length;
 }
 
 }  // namespace unibrow
 
 #endif  // V8_UNICODE_INL_H_