source code
-- The Computer Language Benchmarks Game
-- https://salsa.debian.org/benchmarksgame-team/benchmarksgame/
-- contributed by Wim Couwenberg
--
-- requires LGMP which requires lua >= 5.1, < 5.4
--
-- 21 September 2008
local gmp, aux = {}, {}
require "c-gmp" (gmp, aux)
local add, mul, div = gmp.mpz_add, gmp.mpz_mul_ui, gmp.mpz_fdiv_q
local addmul, submul = gmp.mpz_addmul_ui, gmp.mpz_submul_ui
local init, get, set = gmp.mpz_init_set_d, gmp.mpz_get_d, gmp.mpz_set
--
-- Production:
--
-- [m11 m12] [m11 m12][k 4*k+2]
-- [ 0 m22] <-- [ 0 m22][0 2*k+1]
--
local function produce(m11, m12, m22, k)
local p = 2*k + 1
mul(m12, p, m12)
addmul(m12, m11, 2*p)
mul(m11, k, m11)
mul(m22, p, m22)
end
--
-- Extraction:
--
-- [m11 m12] [10 -10*d][m11 m12]
-- [ 0 m22] <-- [ 0 1 ][ 0 m22]
--
local function extract(m11, m12, m22, d)
submul(m12, m22, d)
mul(m11, 10, m11)
mul(m12, 10, m12)
end
--
-- Get integral part of p/q where
--
-- [p] [m11 m12][d]
-- [q] = [ 0 m22][1]
--
local function digit(m11, m12, m22, d, tmp)
set(tmp, m12)
addmul(tmp, m11, d)
div(tmp, m22, tmp)
return get(tmp)
end
-- Generate successive digits of PI.
local function pidigits(N)
local write = io.write
local m11, m12, m22, tmp = init(1), init(0), init(1), init(0)
local k, i = 1, 0
while i < N do
local d = digit(m11, m12, m22, 3, tmp)
if d == digit(m11, m12, m22, 4, tmp) then
write(d)
extract(m11, m12, m22, d)
i = i + 1; if i % 10 == 0 then write("\t:", i, "\n") end
else
produce(m11, m12, m22, k)
k = k + 1
end
end
if i % 10 ~= 0 then write(string.rep(" ", 10 - N % 10), "\t:", N, "\n") end
end
local N = tonumber(arg and arg[1]) or 27
pidigits(N)