mirror of
https://github.com/luau-lang/luau.git
synced 2024-11-15 14:25:44 +08:00
aafea36235
Previous benchmark require fix wasn't actually working correctly for the old style require (or running in Lua).
80 lines
2.7 KiB
Lua
80 lines
2.7 KiB
Lua
--[[
|
|
MIT License
|
|
|
|
Copyright (c) 2017 Gabriel de Quadros Ligneul
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files (the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights
|
|
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
copies of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in all
|
|
copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
SOFTWARE.
|
|
]]
|
|
-- The Computer Language Benchmarks Game
|
|
-- http://benchmarksgame.alioth.debian.org/
|
|
-- contributed by Mike Pall
|
|
|
|
local function prequire(name) local success, result = pcall(require, name); return if success then result else nil end
|
|
local bench = script and require(script.Parent.bench_support) or prequire("bench_support") or require("../../bench_support")
|
|
|
|
function test()
|
|
|
|
local function fannkuch(n)
|
|
local p, q, s, sign, maxflips, sum = {}, {}, {}, 1, 0, 0
|
|
for i=1,n do p[i] = i; q[i] = i; s[i] = i end
|
|
repeat
|
|
-- Copy and flip.
|
|
local q1 = p[1] -- Cache 1st element.
|
|
if q1 ~= 1 then
|
|
for i=2,n do q[i] = p[i] end -- Work on a copy.
|
|
local flips = 1
|
|
repeat
|
|
local qq = q[q1]
|
|
if qq == 1 then -- ... until 1st element is 1.
|
|
sum = sum + sign*flips
|
|
if flips > maxflips then maxflips = flips end -- New maximum?
|
|
break
|
|
end
|
|
q[q1] = q1
|
|
if q1 >= 4 then
|
|
local i, j = 2, q1 - 1
|
|
repeat q[i], q[j] = q[j], q[i]; i = i + 1; j = j - 1; until i >= j
|
|
end
|
|
q1 = qq; flips = flips + 1
|
|
until false
|
|
end
|
|
if sign == 1 then
|
|
p[2], p[1] = p[1], p[2]; sign = -1 -- Rotate 1<-2.
|
|
else
|
|
p[2], p[3] = p[3], p[2]; sign = 1 -- Rotate 1<-2 and 1<-2<-3.
|
|
for i=3,n do
|
|
local sx = s[i]
|
|
if sx ~= 1 then s[i] = sx-1; break end
|
|
if i == n then return sum, maxflips end -- Out of permutations.
|
|
s[i] = i
|
|
-- Rotate 1<-...<-i+1.
|
|
local t = p[1]; for j=1,i do p[j] = p[j+1] end; p[i+1] = t
|
|
end
|
|
end
|
|
until false
|
|
end
|
|
|
|
local n = tonumber(arg and arg[1]) or 8
|
|
local sum, flips = fannkuch(n)
|
|
print(sum, "\nPfannkuchen(", n, ") = ", flips, "\n")
|
|
|
|
end
|
|
|
|
bench.runCode(test, "fannkuchen-redux")
|