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 /* { dg-do run } */
   7
   8 #include "ffitest.h"
   9 #include "float.h"
  10
  11 #include <math.h>
  12
  13 static long double ldblit(float f)
  14 {
  15   return (long double) (((long double) f)/ (long double) 3.0);
  16 }
  17
  18 int main (void)
  19 {
  20   ffi_cif cif;
  21   ffi_type *args[MAX_ARGS];
  22   void *values[MAX_ARGS];
  23   float f;
  24   long double ld;
  25
  26   args[0] = &ffi_type_float;
  27   values[0] = &f;
  28
  29   /* Initialize the cif */
  30   CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 1,
  31                      &ffi_type_longdouble, args) == FFI_OK);
  32
  33   f = 3.14159;
  34
  35 #if 1
  36   /* This is ifdef'd out for now. long double support under SunOS/gcc
  37      is pretty much non-existent.  You'll get the odd bus error in library
  38      routines like printf().  */
  39   printf ("%Lf\n", ldblit(f));
  40 #endif
  41   ld = 666;
  42   ffi_call(&cif, FFI_FN(ldblit), &ld, values);
  43
  44 #if 1
  45   /* This is ifdef'd out for now. long double support under SunOS/gcc
  46      is pretty much non-existent.  You'll get the odd bus error in library
  47      routines like printf().  */
  48   printf ("%Lf, %Lf, %Lf, %Lf\n", ld, ldblit(f), ld - ldblit(f), LDBL_EPSILON);
  49 #endif
  50
  51   /* These are not always the same!! Check for a reasonable delta */
  52   if (fabsl(ld - ldblit(f)) < LDBL_EPSILON)
  53     puts("long double return value tests ok!");
  54   else
  55     CHECK(0);
  56
  57   exit(0);
  58 }