mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-03 02:25:34 +00:00
6f45c666bc
# ignore-this-changeset Differential Revision: https://phabricator.services.mozilla.com/D14595 --HG-- extra : moz-landing-system : lando
82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
/* -*- 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;
|
|
}
|