libc/test/src/stdbit/stdc_leading_zeros_us_test.cpp

   1 //===-- Unittests for stdc_leading_zeros_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_zeros_us.h"
  11 #include "test/UnitTest/Test.h"
  12
  13 TEST(LlvmLibcStdcLeadingZerosUsTest, Zero) {
  14   EXPECT_EQ(LIBC_NAMESPACE::stdc_leading_zeros_us(0U),
  15             static_cast<unsigned>(USHRT_WIDTH));
  16 }
  17
  18 TEST(LlvmLibcStdcLeadingZerosUsTest, OneHot) {
  19   for (unsigned i = 0U; i != USHRT_WIDTH; ++i)
  20     EXPECT_EQ(LIBC_NAMESPACE::stdc_leading_zeros_us(1U << i),
  21               USHRT_WIDTH - i - 1U);
  22 }