diff options
Diffstat (limited to '')
-rw-r--r-- | mfbt/tests/TestCeilingFloor.cpp | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/mfbt/tests/TestCeilingFloor.cpp b/mfbt/tests/TestCeilingFloor.cpp new file mode 100644 index 0000000000..7bdd6ea27c --- /dev/null +++ b/mfbt/tests/TestCeilingFloor.cpp @@ -0,0 +1,81 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this file, + * You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "mozilla/MathAlgorithms.h" + +using mozilla::CeilingLog2; +using mozilla::FloorLog2; +using mozilla::RoundUpPow2; + +static void TestCeiling() { + for (uint32_t i = 0; i <= 1; i++) { + MOZ_RELEASE_ASSERT(CeilingLog2(i) == 0); + } + for (uint32_t i = 2; i <= 2; i++) { + MOZ_RELEASE_ASSERT(CeilingLog2(i) == 1); + } + for (uint32_t i = 3; i <= 4; i++) { + MOZ_RELEASE_ASSERT(CeilingLog2(i) == 2); + } + for (uint32_t i = 5; i <= 8; i++) { + MOZ_RELEASE_ASSERT(CeilingLog2(i) == 3); + } + for (uint32_t i = 9; i <= 16; i++) { + MOZ_RELEASE_ASSERT(CeilingLog2(i) == 4); + } +} + +static void TestFloor() { + for (uint32_t i = 0; i <= 1; i++) { + MOZ_RELEASE_ASSERT(FloorLog2(i) == 0); + } + for (uint32_t i = 2; i <= 3; i++) { + MOZ_RELEASE_ASSERT(FloorLog2(i) == 1); + } + for (uint32_t i = 4; i <= 7; i++) { + MOZ_RELEASE_ASSERT(FloorLog2(i) == 2); + } + for (uint32_t i = 8; i <= 15; i++) { + MOZ_RELEASE_ASSERT(FloorLog2(i) == 3); + } + for (uint32_t i = 16; i <= 31; i++) { + MOZ_RELEASE_ASSERT(FloorLog2(i) == 4); + } +} + +static void TestRoundUpPow2() { + MOZ_RELEASE_ASSERT(RoundUpPow2(0) == 1); + MOZ_RELEASE_ASSERT(RoundUpPow2(1) == 1); + MOZ_RELEASE_ASSERT(RoundUpPow2(2) == 2); + MOZ_RELEASE_ASSERT(RoundUpPow2(3) == 4); + MOZ_RELEASE_ASSERT(RoundUpPow2(4) == 4); + MOZ_RELEASE_ASSERT(RoundUpPow2(5) == 8); + MOZ_RELEASE_ASSERT(RoundUpPow2(6) == 8); + MOZ_RELEASE_ASSERT(RoundUpPow2(7) == 8); + MOZ_RELEASE_ASSERT(RoundUpPow2(8) == 8); + MOZ_RELEASE_ASSERT(RoundUpPow2(9) == 16); + + MOZ_RELEASE_ASSERT(RoundUpPow2(15) == 16); + MOZ_RELEASE_ASSERT(RoundUpPow2(16) == 16); + MOZ_RELEASE_ASSERT(RoundUpPow2(17) == 32); + + MOZ_RELEASE_ASSERT(RoundUpPow2(31) == 32); + MOZ_RELEASE_ASSERT(RoundUpPow2(32) == 32); + MOZ_RELEASE_ASSERT(RoundUpPow2(33) == 64); + + size_t MaxPow2 = size_t(1) << (sizeof(size_t) * CHAR_BIT - 1); + MOZ_RELEASE_ASSERT(RoundUpPow2(MaxPow2 - 1) == MaxPow2); + MOZ_RELEASE_ASSERT(RoundUpPow2(MaxPow2) == MaxPow2); + // not valid to round up when past the max power of two +} + +int main() { + TestCeiling(); + TestFloor(); + + TestRoundUpPow2(); + return 0; +} |