Correctly handle negative codes in String.fromCharCode()

Correctly handle negative codes in String.fromCharCode()

BUG=166553
R=yangguo@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=13235

[ulan, 2012-12-18 12:15:19]

PTAL

[Yang, 2012-12-18 12:28:22]

LGTM, but its probably cheaper not to do the branch and just always do the
bitwise-and with 0xffff. You can combine that with the previous line that does
the ToNumber conversion and also does the bitwise-and.

[ulan, 2012-12-18 12:36:42]

In most cases the code will be positive, so I guess sign check is cheaper as it
avoids store.

On 2012/12/18 12:28:22, Yang wrote:
> LGTM, but its probably cheaper not to do the branch and just always do the
> bitwise-and with 0xffff. You can combine that with the previous line that does
> the ToNumber conversion and also does the bitwise-and.