Re: switch question in recog.c

["Zack Weinberg" <zack@codesourcery.com>]

Michael Matz <matz@suse.de> writes:

> Hi,
>
> On 7 Oct 2003, Andrew MacLeod wrote:
>
>> Huh. I would have failed that question miserably after using the
>> language for 20 years.
>
> Then you never used a variant of the holy, mighty device from Tom Duff ;-)
>
> Constructed useless example (i.e. not the usual memcpy() unrolling):

"For maximum obfuscation, the outer braces can be removed":

 extern void abort ();
 int f(int i)
 {
   switch (i & 1)
     while (1)
       if (i > 32) {
         abort ();
         case 0: return 1;
       } else {
         abort ();
         case 1: return 2;
       }
 }

> "case x" is a normal label (with the exception that it's scoped to
> the enclosing case statement) introducing a labeled statement, hence
> it can be placed everywhere as long as it's inside a switch.

Except you can't goto a case label.  Occasionally I want to be able to
write "goto default;".

zw