[Bug middle-end/116885] Wrong functionality of vararg causes malfunction or crashes

[JaFojtik at seznam dot cz via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116885

--- Comment #12 from Jaroslav Fojtík <JaFojtik at seznam dot cz> ---
this solution should be correct according to documentation:

typedef union
{
 double d;
 uint64_t u64;
} DblUint64;


     case 'e':{DblUint64 du;
              du.d = va_arg(ap,double);
              writed+=WrQWORD_LoEnd(du.u64,F);
              break;}                 
     case 'E':{DblUint64 du;
               du.d = va_arg(ap,double);
               writed+=WrQWORD_HiEnd(du.u64,F);
               break;}