xref: /llvm-project/libc/test/src/stdbit/stdc_leading_zeros_ull_test.cpp (revision edbd93d3706b806e7c91dfd2c359476488dfcc96) 
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 
TEST(LlvmLibcStdcLeadingZerosUllTest,Zero)14 TEST(LlvmLibcStdcLeadingZerosUllTest, Zero) {
15   EXPECT_EQ(LIBC_NAMESPACE::stdc_leading_zeros_ull(0ULL),
16             static_cast<unsigned>(ULLONG_WIDTH));
17 }
18 
TEST(LlvmLibcStdcLeadingZerosUllTest,OneHot)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 }
24