compiler smarts: register variables and catching exceptions

Hi,

I have a long running loop that uses 4 stacks whose pointers are
declared as register
variables and which catches a SpecialException. The question is
whether the
introduction of the catch block will destroy register optimizations,
and force the
compiler to ignore using registers to hold the stack pointers.

---------------------------------------------------------------------------------------------------------------

do {
     register int* sp1 = ...;
     register int* sp2 = ...;
     register int* sp3 = ...;
     register int* sp4 = ...;

     try {
         do {
             register int op = ...;
             switch (op) {
                  // all of the cases do brief manipulations of the
various sp1,...,sp4
                  // some of the cases call functions which throw
SpecialException
             }
         } while (true);

     } catch (SpecialException& e) {
           // code to cleanup the values currently "held" by the
sp1,...,sp4
           // and then re-enter the outer loop
     }

} while (true);

---------------------------------------------------------------------------------------------------------------------

Thanks,
Andy

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