libc/test/src/stdbit/stdc_first_leading_one_ui_test.cpp

   1 //===-- Unittests for stdc_first_leading_one_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_first_leading_one_ui.h"
  11 #include "test/UnitTest/Test.h"
  12
  13 TEST(LlvmLibcStdcFirstLeadingOneUiTest, Zero) {
  14   EXPECT_EQ(LIBC_NAMESPACE::stdc_first_leading_one_ui(0U), 0U);
  15 }
  16
  17 TEST(LlvmLibcStdcFirstLeadingOneUiTest, OneHot) {
  18   for (unsigned i = 0U; i != UINT_WIDTH; ++i)
  19     EXPECT_EQ(LIBC_NAMESPACE::stdc_first_leading_one_ui(1U << i),
  20               UINT_WIDTH - i);
  21 }