Review request for JDK-8010803: Number to String conversion functionality overhaul

[Hannes Wallnoefer]

I uploaded a new webrev with fixed copyright headers (added Oracle GPL 
headers). Otherwise it is pretty much the same as the first one except 
for minor changes in comments/formatting.

http://cr.openjdk.java.net/~hannesw/8010803/webrev.01/

Hannes


Am 2015-11-06 um 13:59 schrieb Hannes Wallnoefer:
> Please review JDK-8010803: Number to String conversion functionality 
> overhaul:
>
> http://cr.openjdk.java.net/~hannesw/8010803/
>
> This is a mostly complete port of the V8 double conversion code[1] to 
> Java. It includes Bignum-based algorithms for converting doubles to 
> shortest, precision, and fixed decimals representation, as well as 
> specialized faster algorithms for each of the conversion modes.
>
> The only thing I left out is string to number conversion and support 
> for single precision floats, both of which is not needed for Nashorn. 
> I also ported all the relevant tests, which includes 100,000 random 
> numbers for each of the (shortest|precision|fixed) conversion modes as 
> well as well as unit tests for various implementation classes.
>
> With this new dtoa conversion we are fully compatible with all other 
> JS implementations. The fast algorithms are also about 5x faster than 
> what we had before. The fallback Bignum implementation still roughly 
> provides a 2x speedup.
>
> [1]: https://github.com/google/double-conversion
>
> Thanks,
> Hannes