libc/test/src/stdbit/stdc_leading_zeros_ull_test.cpp

   1 //===-- Unittests for stdc_leading_zeros_ull ------------------------------===//
   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 #include "src/__support/CPP/limits.h"
  10 #include "src/stdbit/stdc_leading_zeros_ull.h"
  11 #include "test/UnitTest/Test.h"
  12 #include <stddef.h>
  13
  14 TEST(LlvmLibcStdcLeadingZerosUllTest, Zero) {
  15   EXPECT_EQ(LIBC_NAMESPACE::stdc_leading_zeros_ull(0ULL),
  16             static_cast<unsigned>(ULLONG_WIDTH));
  17 }
  18
  19 TEST(LlvmLibcStdcLeadingZerosUllTest, OneHot) {
  20   for (unsigned i = 0U; i != ULLONG_WIDTH; ++i)
  21     EXPECT_EQ(LIBC_NAMESPACE::stdc_leading_zeros_ull(1ULL << i),
  22               ULLONG_WIDTH - i - 1U);
  23 }