libc/test/src/stdbit/stdc_leading_zeros_uc_test.cpp


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//===-- Unittests for stdc_leading_zeros_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_leading_zeros_uc.h"
#include "test/UnitTest/Test.h"

TEST(LlvmLibcStdcLeadingZerosUcTest, Zero) {
  EXPECT_EQ(LIBC_NAMESPACE::stdc_leading_zeros_uc(0U),
            static_cast<unsigned>(UCHAR_WIDTH));
}

TEST(LlvmLibcStdcLeadingZerosUcTest, OneHot) {
  for (unsigned i = 0U; i != UCHAR_WIDTH; ++i)
    EXPECT_EQ(LIBC_NAMESPACE::stdc_leading_zeros_uc(
                  static_cast<unsigned char>(1U << i)),
              UCHAR_WIDTH - i - 1U);
}