[PATCH] simple speedup in decode_reg_name

[Andrew Pinski]

> 
>  > - if (asmspec != 0)
>  > + if (asmspec != 0 && strlen (asmspec) != 0)
> 
> When looking for a zero length string, wouldn't (*asmspec != '\0') be
> even faster than calling strlen?

I know we have mentioned this before, strlen (x) != 0 gets optimized
into *x != 0, likewise for strlen (x) == 0.

The reason why I spelled out strlen is because it tells the reader
what we are doing and also just in case C strings change their
definition (which will not happen but who knows).  It is also 
easier to change strlen (x) == 0 into something different
for another language.

Thanks,
Andrew Pinski