Re: [ft-devel] endless loops in bytecode

[Werner LEMBERG]

>>  PUSHW[1]
>>    -3
>>  JMPR
>> 
>> The PUSHW instruction pushes one word onto the stack (value -3),
>> which is the offset JMPR is using to jump back
> 
> Did you see jumps back in the real world?

I can't remember whether I've seen JMPR in a font, but JROT and JROF
definitely happen (e.g., in my ttfautohint's bytecode :-) – you need
them for loops where LOOPCALL doesn't provide a good solution.


    Werner