gcc/gcc/testsuite/gcc.dg/dfp/convert-bfp-14.c

/* Test for bug where fold narrowed decimal floating-point
   operations.  */
/* { dg-options "-std=gnu99" } */

extern void abort (void);
extern void exit (int);

volatile _Decimal32 f = 1.23456DF;
volatile _Decimal64 d = 1.23456DD;

int
main (void)
{
  if ((double)((_Decimal64)f * (_Decimal64)f) != (double)(d * d))
    abort ();
  exit (0);
}