Merge pull request #238 from KubaKaszycki/master
[libffi.git] / 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 long double original;
26
27 args[0] = &ffi_type_float;
28 values[0] = &f;
29
30 /* Initialize the cif */
31 CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 1,
32 &ffi_type_longdouble, args) == FFI_OK);
33
34 f = 3.14159;
35
36 #if 1
37 /* This is ifdef'd out for now. long double support under SunOS/gcc
38 is pretty much non-existent. You'll get the odd bus error in library
39 routines like printf(). */
40 printf ("%Lf\n", ldblit(f));
41 #endif
42 ld = 666;
43 ffi_call(&cif, FFI_FN(ldblit), &ld, values);
44
45 #if 1
46 /* This is ifdef'd out for now. long double support under SunOS/gcc
47 is pretty much non-existent. You'll get the odd bus error in library
48 routines like printf(). */
49 printf ("%Lf, %Lf, %Lf, %Lf\n", ld, ldblit(f), ld - ldblit(f), LDBL_EPSILON);
50 #endif
51
52 /* These are not always the same!! Check for a reasonable delta */
53 original = ldblit(f);
54 if (((ld > original) ? (ld - original) : (original - ld)) < LDBL_EPSILON)
55 puts("long double return value tests ok!");
56 else
57 CHECK(0);
58
59 exit(0);
60 }