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b4489621 SP |
1 | /* |
2 | * Copyright (C) 2007 | |
3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
4 | * | |
1a459660 | 5 | * SPDX-License-Identifier: GPL-2.0+ |
b4489621 SP |
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 | ||
b4489621 SP |
15 | #include <post.h> |
16 | ||
ce82ff05 YT |
17 | GNU_FPOST_ATTR |
18 | ||
e009cdeb KG |
19 | #if CONFIG_POST & CONFIG_SYS_POST_FPU |
20 | ||
b4489621 SP |
21 | union uf |
22 | { | |
23 | unsigned int u; | |
24 | float f; | |
25 | }; | |
26 | ||
27 | static float | |
28 | u2f (unsigned int v) | |
29 | { | |
30 | union uf u; | |
31 | u.u = v; | |
32 | return u.f; | |
33 | } | |
34 | ||
35 | static unsigned int | |
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 | |
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 | ||
69 | int fpu_post_test_math7 (void) | |
70 | { | |
71 | unsigned int i; | |
72 | ||
d2397817 | 73 | for (i = 0; i < ARRAY_SIZE(expected); i++) |
b4489621 SP |
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 | ||
6d0f6bcf | 86 | #endif /* CONFIG_POST & CONFIG_SYS_POST_FPU */ |