1//===-- Unittests for stdbit ----------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9/*
10 * The intent of this test is validate that:
11 * 1. We provide the definition of the various type generic macros of stdbit.h
12 * (the macros are transitively included from stdbit-macros.h by stdbit.h).
13 * 2. It dispatches to the correct underlying function.
14 * Because unit tests build without public packaging, the object files produced
15 * do not contain non-namespaced symbols.
16 */
17
18/*
19 * Declare these BEFORE including stdbit-macros.h so that this test may still be
20 * run even if a given target doesn't yet have these individual entrypoints
21 * enabled.
22 */
23#include "stdbit_stub.h"
24
25#include "include/llvm-libc-macros/stdbit-macros.h"
26
27#include <assert.h>
28
29#define CHECK_FUNCTION(FUNC_NAME, VAL) \
30 do { \
31 assert(FUNC_NAME((unsigned char)0U) == VAL##AU); \
32 assert(FUNC_NAME((unsigned short)0U) == VAL##BU); \
33 assert(FUNC_NAME(0U) == VAL##CU); \
34 assert(FUNC_NAME(0UL) == VAL##DU); \
35 assert(FUNC_NAME(0ULL) == VAL##EU); \
36 } while (0)
37
38int main(void) {
39 CHECK_FUNCTION(stdc_leading_zeros, 0xA);
40 CHECK_FUNCTION(stdc_leading_ones, 0xB);
41 CHECK_FUNCTION(stdc_trailing_zeros, 0xC);
42 CHECK_FUNCTION(stdc_trailing_ones, 0xD);
43 CHECK_FUNCTION(stdc_first_leading_zero, 0xE);
44 CHECK_FUNCTION(stdc_first_leading_one, 0xF);
45 CHECK_FUNCTION(stdc_first_trailing_zero, 0x0);
46 CHECK_FUNCTION(stdc_first_trailing_one, 0x1);
47 CHECK_FUNCTION(stdc_count_zeros, 0x2);
48 CHECK_FUNCTION(stdc_count_ones, 0x3);
49
50 assert(!stdc_has_single_bit((unsigned char)1U));
51 assert(!stdc_has_single_bit((unsigned short)1U));
52 assert(!stdc_has_single_bit(1U));
53 assert(!stdc_has_single_bit(1UL));
54 assert(!stdc_has_single_bit(1ULL));
55
56 CHECK_FUNCTION(stdc_bit_width, 0x4);
57 CHECK_FUNCTION(stdc_bit_floor, 0x5);
58 CHECK_FUNCTION(stdc_bit_ceil, 0x6);
59
60 return 0;
61}
62

source code of libc/test/include/stdbit_test.c