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
   9 #include "ffitest.h"
  10 #include "float.h"
  11
  12 static long double ldblit(float f)
  13 {
  14   return (long double) (((long double) f)/ (long double) 3.0);
  15 }
  16
  17 int main (void)
  18 {
  19   ffi_cif cif;
  20   ffi_type *args[MAX_ARGS];
  21   void *values[MAX_ARGS];
  22   float f;
  23   long double ld;
  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_longdouble, args) == FFI_OK);
  31
  32   f = 3.14159;
  33
  34 #if 1
  35   /* This is ifdef'd out for now. long double support under SunOS/gcc
  36      is pretty much non-existent.  You'll get the odd bus error in library
  37      routines like printf().  */
  38   printf ("%Lf\n", ldblit(f));
  39 #endif
  40   ld = 666;
  41   ffi_call(&cif, FFI_FN(ldblit), &ld, values);
  42
  43 #if 1
  44   /* This is ifdef'd out for now. long double support under SunOS/gcc
  45      is pretty much non-existent.  You'll get the odd bus error in library
  46      routines like printf().  */
  47   printf ("%Lf, %Lf, %Lf, %Lf\n", ld, ldblit(f), ld - ldblit(f), LDBL_EPSILON);
  48 #endif
  49
  50   /* These are not always the same!! Check for a reasonable delta */
  51   /*@-realcompare@*/
  52   if (ld - ldblit(f) < LDBL_EPSILON)
  53     /*@=realcompare@*/
  54     puts("long double return value tests ok!");
  55   else
  56     CHECK(0);
  57
  58   exit(0);
  59 }