libffi/testsuite/libffi.call/float1.c

   1 /* Area:        ffi_call
   2    Purpose:     Check return value double.
   3    Limitations: none.
   4    PR:          none.
   5    Originator:  From the original ffitest.c  */
   6
   7 /* { dg-do run } */
   8 #include "ffitest.h"
   9 #include "float.h"
  10
  11 static double dblit(float f)
  12 {
  13   return f/3.0;
  14 }
  15
  16 int main (void)
  17 {
  18   ffi_cif cif;
  19   ffi_type *args[MAX_ARGS];
  20   void *values[MAX_ARGS];
  21   float f;
  22   double d;
  23
  24
  25   args[0] = &ffi_type_float;
  26   values[0] = &f;
  27
  28   /* Initialize the cif */
  29   CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 1,
  30                      &ffi_type_double, args) == FFI_OK);
  31
  32   f = 3.14159;
  33
  34   ffi_call(&cif, FFI_FN(dblit), &d, values);
  35
  36   /* These are not always the same!! Check for a reasonable delta */
  37
  38   CHECK(d - dblit(f) < DBL_EPSILON);
  39
  40   exit(0);
  41
  42 }