libc/test/src/stdbit/stdc_first_leading_zero_uc_test.cpp


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

//===-- Unittests for stdc_first_leading_zero_uc --------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "src/__support/CPP/limits.h"
#include "src/stdbit/stdc_first_leading_zero_uc.h"
#include "test/UnitTest/Test.h"

TEST(LlvmLibcStdcFirstLeadingZeroUcTest, ALL) {
  EXPECT_EQ(LIBC_NAMESPACE::stdc_first_leading_zero_uc(UCHAR_MAX), 0U);
}

TEST(LlvmLibcStdcFirstLeadingZeroUcTest, ZeroHot) {
  for (unsigned i = 0U; i != UCHAR_WIDTH; ++i)
    EXPECT_EQ(LIBC_NAMESPACE::stdc_first_leading_zero_uc(
                  static_cast<unsigned char>(~(1U << i))),
              UCHAR_WIDTH - i);
}