| 1 | |
| 2 |
|
| 3 | #include <linux/errno.h>
|
| 4 |
|
| 5 | #include "test_fpu.h"
|
| 6 |
|
| 7 | int test_fpu(void)
|
| 8 | {
|
| 9 | |
| 10 | * This sequence of operations tests that rounding mode is
|
| 11 | * to nearest and that denormal numbers are supported.
|
| 12 | * Volatile variables are used to avoid compiler optimizing
|
| 13 | * the calculations away.
|
| 14 |
|
| 15 | volatile double a, b, c, d, e, f, g;
|
| 16 |
|
| 17 | a = 4.0;
|
| 18 | b = 1e-15;
|
| 19 | c = 1e-310;
|
| 20 |
|
| 21 |
|
| 22 | d = a + b;
|
| 23 |
|
| 24 |
|
| 25 | e = a + b / 2;
|
| 26 |
|
| 27 |
|
| 28 | f = b / c;
|
| 29 |
|
| 30 |
|
| 31 | g = a + c * f;
|
| 32 |
|
| 33 | if (d > a && e > a && g > a)
|
| 34 | return 0;
|
| 35 | else
|
| 36 | return -EINVAL;
|
| 37 | }
|