1 /*
2 * Copyright (C) 2007
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7 /*
8 * This file is originally a part of the GCC testsuite.
9 * Check that certain subnormal numbers (formerly known as denormalized
10 * numbers) are rounded to within 0.5 ulp. PR other/14354.
11 */
12
13 #include <common.h>
14
15 #include <post.h>
16
17 GNU_FPOST_ATTR
18
19 #if CONFIG_POST & CONFIG_SYS_POST_FPU
20
21 union uf
22 {
23 unsigned int u;
24 float f;
25 };
26
27 static float
u2f(unsigned int v)28 u2f (unsigned int v)
29 {
30 union uf u;
31 u.u = v;
32 return u.f;
33 }
34
35 static unsigned int
f2u(float v)36 f2u (float v)
37 {
38 union uf u;
39 u.f = v;
40 return u.u;
41 }
42
43 static int ok = 1;
44
45 static void
tstmul(unsigned int ux,unsigned int uy,unsigned int ur)46 tstmul (unsigned int ux, unsigned int uy, unsigned int ur)
47 {
48 float x = u2f (ux);
49 float y = u2f (uy);
50
51 if (f2u (x * y) != ur)
52 /* Set a variable rather than aborting here, to simplify tracing when
53 several computations are wrong. */
54 ok = 0;
55 }
56
57 /* We don't want to make this const and static, or else we risk inlining
58 causing the test to fold as constants at compile-time. */
59 struct
60 {
61 unsigned int p1, p2, res;
62 } static volatile expected[] =
63 {
64 {0xfff, 0x3f800400, 0xfff},
65 {0xf, 0x3fc88888, 0x17},
66 {0xf, 0x3f844444, 0xf}
67 };
68
fpu_post_test_math7(void)69 int fpu_post_test_math7 (void)
70 {
71 unsigned int i;
72
73 for (i = 0; i < ARRAY_SIZE(expected); i++)
74 {
75 tstmul (expected[i].p1, expected[i].p2, expected[i].res);
76 tstmul (expected[i].p2, expected[i].p1, expected[i].res);
77 }
78
79 if (!ok) {
80 post_log ("Error in FPU math7 test\n");
81 return -1;
82 }
83 return 0;
84 }
85
86 #endif /* CONFIG_POST & CONFIG_SYS_POST_FPU */
87