libc/test/src/stdbit/stdc_leading_zeros_ui_test.cpp

   1 //===-- Unittests for stdc_leading_zeros_ui -------------------------------===//
   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_ui.h"
  11 #include "test/UnitTest/Test.h"
  12 #include <stddef.h>
  13
  14 TEST(LlvmLibcStdcLeadingZerosUiTest, Zero) {
  15   EXPECT_EQ(LIBC_NAMESPACE::stdc_leading_zeros_ui(0U),
  16             static_cast<unsigned>(
  17                 LIBC_NAMESPACE::cpp::numeric_limits<unsigned int>::digits));
  18 }
  19
  20 TEST(LlvmLibcStdcLeadingZerosUiTest, OneHot) {
  21   for (unsigned i = 0U;
  22        i != LIBC_NAMESPACE::cpp::numeric_limits<unsigned int>::digits; ++i)
  23     EXPECT_EQ(LIBC_NAMESPACE::stdc_leading_zeros_ui(1U << i),
  24               LIBC_NAMESPACE::cpp::numeric_limits<unsigned int>::digits - i -
  25                   1);
  26 }