xref: /llvm-project/libc/test/src/stdbit/stdc_leading_ones_us_test.cpp (revision edbd93d3706b806e7c91dfd2c359476488dfcc96) 
1 //===-- Unittests for stdc_leading_ones_us --------------------------------===//
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_ones_us.h"
11 #include "test/UnitTest/Test.h"
12 
TEST(LlvmLibcStdcLeadingOnesUsTest,All)13 TEST(LlvmLibcStdcLeadingOnesUsTest, All) {
14   EXPECT_EQ(LIBC_NAMESPACE::stdc_leading_ones_us(USHRT_MAX),
15             static_cast<unsigned>(USHRT_WIDTH));
16 }
17 
TEST(LlvmLibcStdcLeadingOnesUsTest,ZeroHot)18 TEST(LlvmLibcStdcLeadingOnesUsTest, ZeroHot) {
19   for (unsigned i = 0U; i != USHRT_WIDTH; ++i)
20     EXPECT_EQ(LIBC_NAMESPACE::stdc_leading_ones_us(~(1U << i)),
21               USHRT_WIDTH - i - 1U);
22 }
23