libffi/testsuite/libffi.call/float2.c

   1 /* Area:        ffi_call
   2    Purpose:     Check return value long 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 long double ldblit(float f)
  12 {
  13   return (long double) (((long double) f)/ (long double) 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   long double ld;
  23
  24   args[0] = &ffi_type_float;
  25   values[0] = &f;
  26
  27   /* Initialize the cif */
  28   CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 1,
  29                      &ffi_type_longdouble, args) == FFI_OK);
  30
  31   f = 3.14159;
  32
  33 #if 1
  34   /* This is ifdef'd out for now. long double support under SunOS/gcc
  35      is pretty much non-existent.  You'll get the odd bus error in library
  36      routines like printf().  */
  37   printf ("%Lf\n", ldblit(f));
  38 #endif
  39   ld = 666;
  40   ffi_call(&cif, FFI_FN(ldblit), &ld, values);
  41
  42 #if 1
  43   /* This is ifdef'd out for now. long double support under SunOS/gcc
  44      is pretty much non-existent.  You'll get the odd bus error in library
  45      routines like printf().  */
  46   printf ("%Lf, %Lf, %Lf, %Lf\n", ld, ldblit(f), ld - ldblit(f), LDBL_EPSILON);
  47 #endif
  48
  49   /* These are not always the same!! Check for a reasonable delta */
  50   /*@-realcompare@*/
  51   if (ld - ldblit(f) < LDBL_EPSILON)
  52     /*@=realcompare@*/
  53     puts("long double return value tests ok!");
  54   else
  55     CHECK(0);
  56
  57   exit(0);
  58 }