libffi/testsuite/libffi.call/return_dbl.c

   1 /* Area:        ffi_call
   2    Purpose:     Check return value double.
   3    Limitations: none.
   4    PR:          none.
   5    Originator:  <andreast@gcc.gnu.org> 20050212  */
   6
   7 /* { dg-do run } */
   8 #include "ffitest.h"
   9
  10 static double return_dbl(double dbl)
  11 {
  12   printf ("%f\n", dbl);
  13   return 2 * dbl;
  14 }
  15 int main (void)
  16 {
  17   ffi_cif cif;
  18   ffi_type *args[MAX_ARGS];
  19   void *values[MAX_ARGS];
  20   double dbl, rdbl;
  21
  22   args[0] = &ffi_type_double;
  23   values[0] = &dbl;
  24
  25   /* Initialize the cif */
  26   CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 1,
  27                      &ffi_type_double, args) == FFI_OK);
  28
  29   for (dbl = -127.3; dbl <  127; dbl++)
  30     {
  31       ffi_call(&cif, FFI_FN(return_dbl), &rdbl, values);
  32       printf ("%f vs %f\n", rdbl, return_dbl(dbl));
  33       CHECK(rdbl == 2 * dbl);
  34     }
  35   exit(0);
  36 }