gcc/testsuite/gcc.dg/990130-1.c

   1 /* { dg-do compile { target i?86-*-* } } */
   2 /* { dg-options -O0 } */
   3
   4 typedef          int SItype     __attribute__ ((mode (SI)));
   5 typedef          int DItype     __attribute__ ((mode (DI)));
   6 typedef unsigned int USItype    __attribute__ ((mode (SI)));
   7   struct DIstruct {SItype low, high;};
   8 typedef union
   9 {
  10   struct DIstruct s;
  11   DItype ll;
  12 } DIunion;
  13 DItype
  14 __muldi3 (DItype u, DItype v)
  15 {
  16   DIunion w;
  17   DIunion uu, vv;
  18   uu.ll = u,
  19   vv.ll = v;
  20   w.ll = ({DIunion __w; __asm__ ("mull %3"      : "=a" ((USItype) (  __w.s.low )),      "=d" ((USItype) ( __w.s.high )) : "%0" ((USItype) (   uu.s.low  )),     "rm" ((USItype) (    vv.s.low  ))) ;    __w.ll; }) ;
  21   w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
  22                + (USItype) uu.s.high * (USItype) vv.s.low);
  23   return w.ll;
  24 }