xref: /llvm-project/libc/test/src/stdbit/stdc_first_leading_one_ul_test.cpp (revision 60596716c2327575fc8ea16eab3321dabc4a706f) 
1 //===-- Unittests for stdc_first_leading_one_ul ---------------------------===//
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_first_leading_one_ul.h"
11 #include "test/UnitTest/Test.h"
12 
TEST(LlvmLibcStdcFirstLeadingOneUlTest,Zero)13 TEST(LlvmLibcStdcFirstLeadingOneUlTest, Zero) {
14   EXPECT_EQ(LIBC_NAMESPACE::stdc_first_leading_one_ul(0UL), 0U);
15 }
16 
TEST(LlvmLibcStdcFirstLeadingOneUlTest,OneHot)17 TEST(LlvmLibcStdcFirstLeadingOneUlTest, OneHot) {
18   for (unsigned i = 0U; i != ULONG_WIDTH; ++i)
19     EXPECT_EQ(LIBC_NAMESPACE::stdc_first_leading_one_ul(1UL << i),
20               ULONG_WIDTH - i);
21 }
22