gcc/testsuite/gcc.target/i386/pr33552.c

   1 /* PR rtl-optimization/33552 */
   2 /* { dg-do run } */
   3 /* { dg-options "-O2" } */
   4
   5 extern void abort (void);
   6
   7 void
   8 __attribute__((noinline))
   9 foo (unsigned long *wp, unsigned long *up, long un, unsigned long *vp)
  10 {
  11   long j;
  12   unsigned long prod_low, prod_high;
  13   unsigned long cy_dig;
  14   unsigned long v_limb;
  15   v_limb = vp[0];
  16   cy_dig = 64;
  17   for (j = un; j > 0; j--)
  18     {
  19       unsigned long u_limb, w_limb;
  20       u_limb = *up++;
  21       __asm__ (""
  22                : "=r" (prod_low), "=r" (prod_high)
  23                : "0" (u_limb), "1" (v_limb));
  24       __asm__ ("mov %5, %1; add %5, %0"
  25                : "=r" (cy_dig), "=&r" (w_limb)
  26                : "0" (prod_high), "rm" (0), "1" (prod_low), "rm" (cy_dig));
  27       *wp++ = w_limb;
  28     }
  29 }
  30
  31 int
  32 main (void)
  33 {
  34   unsigned long wp[4];
  35   unsigned long up[4] = { 0x1248, 0x248a, 0x1745, 0x1853 };
  36   unsigned long vp = 0xdead;
  37   foo (wp, up, 4, &vp);
  38   if (wp[0] != 0x40 || wp[1] != 0xdeed || wp[2] != 0x1bd9a || wp[3] != 0x29c47)
  39     abort ();
  40   return 0;
  41 }