Revert r4591

src/fast-dtoa.h

 // Copyright 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 18 matching lines @@
 #define V8_FAST_DTOA_H_
 
 namespace v8 {
 namespace internal {
 
 // FastDtoa will produce at most kFastDtoaMaximalLength digits. This does not
 // include the terminating '\0' character.
 static const int kFastDtoaMaximalLength = 17;
 
 // Provides a decimal representation of v.
-// v must be a strictly positive finite double.
+// v must not be (positive or negative) zero and it must not be Infinity or NaN.
 // Returns true if it succeeds, otherwise the result can not be trusted.
 // There will be *length digits inside the buffer followed by a null terminator.
 // If the function returns true then
 //   v == (double) (buffer * 10^(point - length)).
 // The digits in the buffer are the shortest representation possible: no
 // 0.099999999999 instead of 0.1.
 // The last digit will be closest to the actual v. That is, even if several
 // digits might correctly yield 'v' when read again, the buffer will contain the
 // one closest to v.
 // The variable 'sign' will be '0' if the given number is positive, and '1'
 //   otherwise.
 bool FastDtoa(double d,
               Vector<char> buffer,
+              int* sign,
               int* length,
               int* point);
 
 } }  // namespace v8::internal
 
 #endif  // V8_FAST_DTOA_H_