%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2015-2018. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
%% =====================================================================
%% Multiple PRNG module for Erlang/OTP
%% Copyright (c) 2015-2016 Kenji Rikitake
%%
%% exrop (xoroshiro116+) added, statistical distribution
%% improvements and uniform_real added by the Erlang/OTP team 2017
%% =====================================================================
-module(rand).
-export([seed_s/1, seed_s/2, seed/1, seed/2,
export_seed/0, export_seed_s/1,
uniform/0, uniform/1, uniform_s/1, uniform_s/2,
uniform_real/0, uniform_real_s/1,
jump/0, jump/1,
normal/0, normal/2, normal_s/1, normal_s/3
]).
%% Test, dev and internal
-export([exro928_jump_2pow512/1, exro928_jump_2pow20/1,
exro928_seed/1, exro928_next/1, exro928_next_state/1,
format_jumpconst58/1, seed58/2]).
%% Debug
-export([make_float/3, float2str/1, bc64/1]).
-compile({inline, [exs64_next/1, exsplus_next/1, exsss_next/1,
exs1024_next/1, exs1024_calc/2,
exro928_next_state/4,
exrop_next/1, exrop_next_s/2,
get_52/1, normal_kiwi/1]}).
-define(DEFAULT_ALG_HANDLER, exsss).
-define(SEED_DICT, rand_seed).
%% =====================================================================
%% Bit fiddling macros
%% =====================================================================
-define(BIT(Bits), (1 bsl (Bits))).
-define(MASK(Bits), (?BIT(Bits) - 1)).
-define(MASK(Bits, X), ((X) band ?MASK(Bits))).
-define(
BSL(Bits, X, N),
%% N is evaluated 2 times
(?MASK((Bits)-(N), (X)) bsl (N))).
-define(
ROTL(Bits, X, N),
%% Bits is evaluated 2 times
%% X is evaluated 2 times
%% N i evaluated 3 times
(?BSL((Bits), (X), (N)) bor ((X) bsr ((Bits)-(N))))).
-define(
BC(V, N),
bc((V), ?BIT((N) - 1), N)).
%%-define(TWO_POW_MINUS53, (math:pow(2, -53))).
-define(TWO_POW_MINUS53, 1.11022302462515657e-16).
%% =====================================================================
%% Types
%% =====================================================================
-type uint64() :: 0..?MASK(64).
-type uint58() :: 0..?MASK(58).
%% This depends on the algorithm handler function
-type alg_state() ::
exsplus_state() | exro928_state() | exrop_state() | exs1024_state() |
exs64_state() | term().
%% This is the algorithm handling definition within this module,
%% and the type to use for plugins.
%%
%% The 'type' field must be recognized by the module that implements
%% the algorithm, to interpret an exported state.
%%
%% The 'bits' field indicates how many bits the integer
%% returned from 'next' has got, i.e 'next' shall return
%% an random integer in the range 0..(2^Bits - 1).
%% At least 55 bits is required for the floating point
%% producing fallbacks, but 56 bits would be more future proof.
%%
%% The fields 'next', 'uniform' and 'uniform_n'
%% implement the algorithm. If 'uniform' or 'uniform_n'
%% is not present there is a fallback using 'next' and either
%% 'bits' or the deprecated 'max'. The 'next' function
%% must generate a word with at least 56 good random bits.
%%
%% The 'weak_low_bits' field indicate how many bits are of
%% lesser quality and they will not be used by the floating point
%% producing functions, nor by the range producing functions
%% when more bits are needed, to avoid weak bits in the middle
%% of the generated bits. The lowest bits from the range
%% functions still have the generator's quality.
%%
-type alg_handler() ::
#{type := alg(),
bits => non_neg_integer(),
weak_low_bits => non_neg_integer(),
max => non_neg_integer(), % Deprecated
next :=
fun ((alg_state()) -> {non_neg_integer(), alg_state()}),
uniform =>
fun ((state()) -> {float(), state()}),
uniform_n =>
fun ((pos_integer(), state()) -> {pos_integer(), state()}),
jump =>
fun ((state()) -> state())}.
%% Algorithm state
-type state() :: {alg_handler(), alg_state()}.
-type builtin_alg() ::
exsss | exro928ss | exrop | exs1024s | exsp | exs64 | exsplus | exs1024.
-type alg() :: builtin_alg() | atom().
-type export_state() :: {alg(), alg_state()}.
-type seed() :: [integer()] | integer() | {integer(), integer(), integer()}.
-export_type(
[builtin_alg/0, alg/0, alg_handler/0, alg_state/0,
state/0, export_state/0, seed/0]).
-export_type(
[exsplus_state/0, exro928_state/0, exrop_state/0, exs1024_state/0,
exs64_state/0]).
%% =====================================================================
%% Range macro and helper
%% =====================================================================
-define(
uniform_range(Range, Alg, R, V, MaxMinusRange, I),
if
0 =< (MaxMinusRange) ->
if
%% Really work saving in odd cases;
%% large ranges in particular
(V) < (Range) ->
{(V) + 1, {(Alg), (R)}};
true ->
(I) = (V) rem (Range),
if
(V) - (I) =< (MaxMinusRange) ->
{(I) + 1, {(Alg), (R)}};
true ->
%% V in the truncated top range
%% - try again
?FUNCTION_NAME((Range), {(Alg), (R)})
end
end;
true ->
uniform_range((Range), (Alg), (R), (V))
end).
%% For ranges larger than the algorithm bit size
uniform_range(Range, #{next:=Next, bits:=Bits} = Alg, R, V) ->
WeakLowBits = maps:get(weak_low_bits, Alg, 0),
%% Maybe waste the lowest bit(s) when shifting in new bits
Shift = Bits - WeakLowBits,
ShiftMask = bnot ?MASK(WeakLowBits),
RangeMinus1 = Range - 1,
if
(Range band RangeMinus1) =:= 0 -> % Power of 2
%% Generate at least the number of bits for the range
{V1, R1, _} =
uniform_range(
Range bsr Bits, Next, R, V, ShiftMask, Shift, Bits),
{(V1 band RangeMinus1) + 1, {Alg, R1}};
true ->
%% Generate a value with at least two bits more than the range
%% and try that for a fit, otherwise recurse
%%
%% Just one bit more should ensure that the generated
%% number range is at least twice the size of the requested
%% range, which would make the probability to draw a good
%% number better than 0.5. And repeating that until
%% success i guess would take 2 times statistically amortized.
%% But since the probability for fairly many attemtpts
%% is not that low, use two bits more than the range which
%% should make the probability to draw a bad number under 0.25,
%% which decreases the bad case probability a lot.
{V1, R1, B} =
uniform_range(
Range bsr (Bits - 2), Next, R, V, ShiftMask, Shift, Bits),
I = V1 rem Range,
if
(V1 - I) =< (1 bsl B) - Range ->
{I + 1, {Alg, R1}};
true ->
%% V1 drawn from the truncated top range
%% - try again
{V2, R2} = Next(R1),
uniform_range(Range, Alg, R2, V2)
end
end.
%%
uniform_range(Range, Next, R, V, ShiftMask, Shift, B) ->
if
Range =< 1 ->
{V, R, B};
true ->
{V1, R1} = Next(R),
%% Waste the lowest bit(s) when shifting in new bits
uniform_range(
Range bsr Shift, Next, R1,
((V band ShiftMask) bsl Shift) bor V1,
ShiftMask, Shift, B + Shift)
end.
%% =====================================================================
%% API
%% =====================================================================
%% Return algorithm and seed so that RNG state can be recreated with seed/1
-spec export_seed() -> undefined | export_state().
export_seed() ->
case get(?SEED_DICT) of
{#{type:=Alg}, Seed} -> {Alg, Seed};
_ -> undefined
end.
-spec export_seed_s(State :: state()) -> export_state().
export_seed_s({#{type:=Alg}, AlgState}) -> {Alg, AlgState}.
%% seed(Alg) seeds RNG with runtime dependent values
%% and return the NEW state
%% seed({Alg,AlgState}) setup RNG with a previously exported seed
%% and return the NEW state
-spec seed(
AlgOrStateOrExpState :: builtin_alg() | state() | export_state()) ->
state().
seed(Alg) ->
seed_put(seed_s(Alg)).
-spec seed_s(
AlgOrStateOrExpState :: builtin_alg() | state() | export_state()) ->
state().
seed_s({AlgHandler, _AlgState} = State) when is_map(AlgHandler) ->
State;
seed_s({Alg, AlgState}) when is_atom(Alg) ->
{AlgHandler,_SeedFun} = mk_alg(Alg),
{AlgHandler,AlgState};
seed_s(Alg) ->
seed_s(Alg, {erlang:phash2([{node(),self()}]),
erlang:system_time(),
erlang:unique_integer()}).
%% seed/2: seeds RNG with the algorithm and given values
%% and returns the NEW state.
-spec seed(Alg :: builtin_alg(), Seed :: seed()) -> state().
seed(Alg, Seed) ->
seed_put(seed_s(Alg, Seed)).
-spec seed_s(Alg :: builtin_alg(), Seed :: seed()) -> state().
seed_s(Alg, Seed) ->
{AlgHandler,SeedFun} = mk_alg(Alg),
AlgState = SeedFun(Seed),
{AlgHandler,AlgState}.
%%% uniform/0, uniform/1, uniform_s/1, uniform_s/2 are all
%%% uniformly distributed random numbers.
%% uniform/0: returns a random float X where 0.0 =< X < 1.0,
%% updating the state in the process dictionary.
-spec uniform() -> X :: float().
uniform() ->
{X, State} = uniform_s(seed_get()),
_ = seed_put(State),
X.
%% uniform/1: given an integer N >= 1,
%% uniform/1 returns a random integer X where 1 =< X =< N,
%% updating the state in the process dictionary.
-spec uniform(N :: pos_integer()) -> X :: pos_integer().
uniform(N) ->
{X, State} = uniform_s(N, seed_get()),
_ = seed_put(State),
X.
%% uniform_s/1: given a state, uniform_s/1
%% returns a random float X where 0.0 =< X < 1.0,
%% and a new state.
-spec uniform_s(State :: state()) -> {X :: float(), NewState :: state()}.
uniform_s(State = {#{uniform:=Uniform}, _}) ->
Uniform(State);
uniform_s({#{bits:=Bits, next:=Next} = Alg, R0}) ->
{V, R1} = Next(R0),
%% Produce floats on the form N * 2^(-53)
{(V bsr (Bits - 53)) * ?TWO_POW_MINUS53, {Alg, R1}};
uniform_s({#{max:=Max, next:=Next} = Alg, R0}) ->
{V, R1} = Next(R0),
%% Old algorithm with non-uniform density
{V / (Max + 1), {Alg, R1}}.
%% uniform_s/2: given an integer N >= 1 and a state, uniform_s/2
%% uniform_s/2 returns a random integer X where 1 =< X =< N,
%% and a new state.
-spec uniform_s(N :: pos_integer(), State :: state()) ->
{X :: pos_integer(), NewState :: state()}.
uniform_s(N, State = {#{uniform_n:=UniformN}, _})
when is_integer(N), 1 =< N ->
UniformN(N, State);
uniform_s(N, {#{bits:=Bits, next:=Next} = Alg, R0})
when is_integer(N), 1 =< N ->
{V, R1} = Next(R0),
MaxMinusN = ?BIT(Bits) - N,
?uniform_range(N, Alg, R1, V, MaxMinusN, I);
uniform_s(N, {#{max:=Max, next:=Next} = Alg, R0})
when is_integer(N), 1 =< N ->
%% Old algorithm with skewed probability
%% and gap in ranges > Max
{V, R1} = Next(R0),
if
N =< Max ->
{(V rem N) + 1, {Alg, R1}};
true ->
F = V / (Max + 1),
{trunc(F * N) + 1, {Alg, R1}}
end.
%% uniform_real/0: returns a random float X where 0.0 < X =< 1.0,
%% updating the state in the process dictionary.
-spec uniform_real() -> X :: float().
uniform_real() ->
{X, Seed} = uniform_real_s(seed_get()),
_ = seed_put(Seed),
X.
%% uniform_real_s/1: given a state, uniform_s/1
%% returns a random float X where 0.0 < X =< 1.0,
%% and a new state.
%%
%% This function does not use the same form of uniformity
%% as the uniform_s/1 function.
%%
%% Instead, this function does not generate numbers with equal
%% distance in the interval, but rather tries to keep all mantissa
%% bits random also for small numbers, meaning that the distance
%% between possible numbers decreases when the numbers
%% approaches 0.0, as does the possibility for a particular
%% number. Hence uniformity is preserved.
%%
%% To generate 56 bits at the time instead of 53 is actually
%% a speed optimization since the probability to have to
%% generate a second word decreases by 1/2 for every extra bit.
%%
%% This function generates normalized numbers, so the smallest number
%% that can be generated is 2^-1022 with the distance 2^-1074
%% to the next to smallest number, compared to 2^-53 for uniform_s/1.
%%
%% This concept of uniformity should work better for applications
%% where you need to calculate 1.0/X or math:log(X) since those
%% operations benefits from larger precision approaching 0.0,
%% and that this function does not return 0.0 nor denormalized
%% numbers very close to 0.0. The log() operation in The Box-Muller
%% transformation for normal distribution is an example of this.
%%
%%-define(TWO_POW_MINUS55, (math:pow(2, -55))).
%%-define(TWO_POW_MINUS110, (math:pow(2, -110))).
%%-define(TWO_POW_MINUS55, 2.7755575615628914e-17).
%%-define(TWO_POW_MINUS110, 7.7037197775489436e-34).
%%
-spec uniform_real_s(State :: state()) -> {X :: float(), NewState :: state()}.
uniform_real_s({#{bits:=Bits, next:=Next} = Alg, R0}) ->
%% Generate a 56 bit number without using the weak low bits.
%%
%% Be sure to use only 53 bits when multiplying with
%% math:pow(2.0, -N) to avoid rounding which would make
%% "even" floats more probable than "odd".
%%
{V1, R1} = Next(R0),
M1 = V1 bsr (Bits - 56),
if
?BIT(55) =< M1 ->
%% We have 56 bits - waste 3
{(M1 bsr 3) * math:pow(2.0, -53), {Alg, R1}};
?BIT(54) =< M1 ->
%% We have 55 bits - waste 2
{(M1 bsr 2) * math:pow(2.0, -54), {Alg, R1}};
?BIT(53) =< M1 ->
%% We have 54 bits - waste 1
{(M1 bsr 1) * math:pow(2.0, -55), {Alg, R1}};
?BIT(52) =< M1 ->
%% We have 53 bits - use all
{M1 * math:pow(2.0, -56), {Alg, R1}};
true ->
%% Need more bits
{V2, R2} = Next(R1),
uniform_real_s(Alg, Next, M1, -56, R2, V2, Bits)
end;
uniform_real_s({#{max:=_, next:=Next} = Alg, R0}) ->
%% Generate a 56 bit number.
%% Ignore the weak low bits for these old algorithms,
%% just produce something reasonable.
%%
%% Be sure to use only 53 bits when multiplying with
%% math:pow(2.0, -N) to avoid rounding which would make
%% "even" floats more probable than "odd".
%%
{V1, R1} = Next(R0),
M1 = ?MASK(56, V1),
if
?BIT(55) =< M1 ->
%% We have 56 bits - waste 3
{(M1 bsr 3) * math:pow(2.0, -53), {Alg, R1}};
?BIT(54) =< M1 ->
%% We have 55 bits - waste 2
{(M1 bsr 2) * math:pow(2.0, -54), {Alg, R1}};
?BIT(53) =< M1 ->
%% We have 54 bits - waste 1
{(M1 bsr 1) * math:pow(2.0, -55), {Alg, R1}};
?BIT(52) =< M1 ->
%% We have 53 bits - use all
{M1 * math:pow(2.0, -56), {Alg, R1}};
true ->
%% Need more bits
{V2, R2} = Next(R1),
uniform_real_s(Alg, Next, M1, -56, R2, V2, 56)
end.
uniform_real_s(Alg, _Next, M0, -1064, R1, V1, Bits) -> % 19*56
%% This is a very theoretical bottom case.
%% The odds of getting here is about 2^-1008,
%% through a white box test case, or thanks to
%% a malfunctioning PRNG producing 18 56-bit zeros in a row.
%%
%% Fill up to 53 bits, we have at most 52
B0 = (53 - ?BC(M0, 52)), % Missing bits
{(((M0 bsl B0) bor (V1 bsr (Bits - B0))) * math:pow(2.0, -1064 - B0)),
{Alg, R1}};
uniform_real_s(Alg, Next, M0, BitNo, R1, V1, Bits) ->
if
%% Optimize the most probable.
%% Fill up to 53 bits.
?BIT(51) =< M0 ->
%% We have 52 bits in M0 - need 1
{(((M0 bsl 1) bor (V1 bsr (Bits - 1)))
* math:pow(2.0, BitNo - 1)),
{Alg, R1}};
?BIT(50) =< M0 ->
%% We have 51 bits in M0 - need 2
{(((M0 bsl 2) bor (V1 bsr (Bits - 2)))
* math:pow(2.0, BitNo - 2)),
{Alg, R1}};
?BIT(49) =< M0 ->
%% We have 50 bits in M0 - need 3
{(((M0 bsl 3) bor (V1 bsr (Bits - 3)))
* math:pow(2.0, BitNo - 3)),
{Alg, R1}};
M0 == 0 ->
M1 = V1 bsr (Bits - 56),
if
?BIT(55) =< M1 ->
%% We have 56 bits - waste 3
{(M1 bsr 3) * math:pow(2.0, BitNo - 53), {Alg, R1}};
?BIT(54) =< M1 ->
%% We have 55 bits - waste 2
{(M1 bsr 2) * math:pow(2.0, BitNo - 54), {Alg, R1}};
?BIT(53) =< M1 ->
%% We have 54 bits - waste 1
{(M1 bsr 1) * math:pow(2.0, BitNo - 55), {Alg, R1}};
?BIT(52) =< M1 ->
%% We have 53 bits - use all
{M1 * math:pow(2.0, BitNo - 56), {Alg, R1}};
BitNo =:= -1008 ->
%% Endgame
%% For the last round we cannot have 14 zeros or more
%% at the top of M1 because then we will underflow,
%% so we need at least 43 bits
if
?BIT(42) =< M1 ->
%% We have 43 bits - get the last bits
uniform_real_s(Alg, Next, M1, BitNo - 56, R1);
true ->
%% Would underflow 2^-1022 - start all over
%%
%% We could just crash here since the odds for
%% the PRNG being broken is much higher than
%% for a good PRNG generating this many zeros
%% in a row. Maybe we should write an error
%% report or call this a system limit...?
uniform_real_s({Alg, R1})
end;
true ->
%% Need more bits
uniform_real_s(Alg, Next, M1, BitNo - 56, R1)
end;
true ->
%% Fill up to 53 bits
B0 = 53 - ?BC(M0, 49), % Number of bits we need to append
{(((M0 bsl B0) bor (V1 bsr (Bits - B0)))
* math:pow(2.0, BitNo - B0)),
{Alg, R1}}
end.
%%
uniform_real_s(#{bits:=Bits} = Alg, Next, M0, BitNo, R0) ->
{V1, R1} = Next(R0),
uniform_real_s(Alg, Next, M0, BitNo, R1, V1, Bits);
uniform_real_s(#{max:=_} = Alg, Next, M0, BitNo, R0) ->
{V1, R1} = Next(R0),
uniform_real_s(Alg, Next, M0, BitNo, R1, ?MASK(56, V1), 56).
%% jump/1: given a state, jump/1
%% returns a new state which is equivalent to that
%% after a large number of call defined for each algorithm.
%% The large number is algorithm dependent.
-spec jump(state()) -> NewState :: state().
jump(State = {#{jump:=Jump}, _}) ->
Jump(State);
jump({#{}, _}) ->
erlang:error(not_implemented).
%% jump/0: read the internal state and
%% apply the jump function for the state as in jump/1
%% and write back the new value to the internal state,
%% then returns the new value.
-spec jump() -> NewState :: state().
jump() ->
seed_put(jump(seed_get())).
%% normal/0: returns a random float with standard normal distribution
%% updating the state in the process dictionary.
-spec normal() -> float().
normal() ->
{X, Seed} = normal_s(seed_get()),
_ = seed_put(Seed),
X.
%% normal/2: returns a random float with N(μ, σ²) normal distribution
%% updating the state in the process dictionary.
-spec normal(Mean :: number(), Variance :: number()) -> float().
normal(Mean, Variance) ->
Mean + (math:sqrt(Variance) * normal()).
%% normal_s/1: returns a random float with standard normal distribution
%% The Ziggurat Method for generating random variables - Marsaglia and Tsang
%% Paper and reference code: http://www.jstatsoft.org/v05/i08/
-spec normal_s(State :: state()) -> {float(), NewState :: state()}.
normal_s(State0) ->
{Sign, R, State} = get_52(State0),
Idx = ?MASK(8, R),
Idx1 = Idx+1,
{Ki, Wi} = normal_kiwi(Idx1),
X = R * Wi,
case R < Ki of
%% Fast path 95% of the time
true when Sign =:= 0 -> {X, State};
true -> {-X, State};
%% Slow path
false when Sign =:= 0 -> normal_s(Idx, Sign, X, State);
false -> normal_s(Idx, Sign, -X, State)
end.
%% normal_s/3: returns a random float with normal N(μ, σ²) distribution
-spec normal_s(Mean :: number(), Variance :: number(), state()) -> {float(), NewS :: state()}.
normal_s(Mean, Variance, State0) when Variance > 0 ->
{X, State} = normal_s(State0),
{Mean + (math:sqrt(Variance) * X), State}.
%% =====================================================================
%% Internal functions
-spec seed_put(state()) -> state().
seed_put(Seed) ->
put(?SEED_DICT, Seed),
Seed.
seed_get() ->
case get(?SEED_DICT) of
undefined -> seed(?DEFAULT_ALG_HANDLER);
Old -> Old % no type checking here
end.
%% Setup alg record
mk_alg(exs64) ->
{#{type=>exs64, max=>?MASK(64), next=>fun exs64_next/1},
fun exs64_seed/1};
mk_alg(exsplus) ->
{#{type=>exsplus, max=>?MASK(58), next=>fun exsplus_next/1,
jump=>fun exsplus_jump/1},
fun exsplus_seed/1};
mk_alg(exsp) ->
{#{type=>exsp, bits=>58, weak_low_bits=>1, next=>fun exsplus_next/1,
uniform=>fun exsp_uniform/1, uniform_n=>fun exsp_uniform/2,
jump=>fun exsplus_jump/1},
fun exsplus_seed/1};
mk_alg(exsss) ->
{#{type=>exsss, bits=>58, next=>fun exsss_next/1,
uniform=>fun exsss_uniform/1, uniform_n=>fun exsss_uniform/2,
jump=>fun exsplus_jump/1},
fun exsss_seed/1};
mk_alg(exs1024) ->
{#{type=>exs1024, max=>?MASK(64), next=>fun exs1024_next/1,
jump=>fun exs1024_jump/1},
fun exs1024_seed/1};
mk_alg(exs1024s) ->
{#{type=>exs1024s, bits=>64, weak_low_bits=>3, next=>fun exs1024_next/1,
jump=>fun exs1024_jump/1},
fun exs1024_seed/1};
mk_alg(exrop) ->
{#{type=>exrop, bits=>58, weak_low_bits=>1, next=>fun exrop_next/1,
uniform=>fun exrop_uniform/1, uniform_n=>fun exrop_uniform/2,
jump=>fun exrop_jump/1},
fun exrop_seed/1};
mk_alg(exro928ss) ->
{#{type=>exro928ss, bits=>58, next=>fun exro928ss_next/1,
uniform=>fun exro928ss_uniform/1,
uniform_n=>fun exro928ss_uniform/2,
jump=>fun exro928_jump/1},
fun exro928_seed/1}.
%% =====================================================================
%% exs64 PRNG: Xorshift64*
%% Algorithm by Sebastiano Vigna
%% Reference URL: http://xorshift.di.unimi.it/
%% =====================================================================
-opaque exs64_state() :: uint64().
exs64_seed(L) when is_list(L) ->
[R] = seed64_nz(1, L),
R;
exs64_seed(A) when is_integer(A) ->
[R] = seed64(1, ?MASK(64, A)),
R;
%%
%% Traditional integer triplet seed
exs64_seed({A1, A2, A3}) ->
{V1, _} = exs64_next((?MASK(32, A1) * 4294967197 + 1)),
{V2, _} = exs64_next((?MASK(32, A2) * 4294967231 + 1)),
{V3, _} = exs64_next((?MASK(32, A3) * 4294967279 + 1)),
((V1 * V2 * V3) rem (?MASK(64) - 1)) + 1.
%% Advance xorshift64* state for one step and generate 64bit unsigned integer
-spec exs64_next(exs64_state()) -> {uint64(), exs64_state()}.
exs64_next(R) ->
R1 = R bxor (R bsr 12),
R2 = R1 bxor ?BSL(64, R1, 25),
R3 = R2 bxor (R2 bsr 27),
{?MASK(64, R3 * 2685821657736338717), R3}.
%% =====================================================================
%% exsplus PRNG: Xorshift116+
%% Algorithm by Sebastiano Vigna
%% Reference URL: http://xorshift.di.unimi.it/
%% 58 bits fits into an immediate on 64bits erlang and is thus much faster.
%% Modification of the original Xorshift128+ algorithm to 116
%% by Sebastiano Vigna, a lot of thanks for his help and work.
%%
%% Reference C code for Xorshift116+ and Xorshift116**
%%
%% #include <stdint.h>
%%
%% #define MASK(b, v) (((UINT64_C(1) << (b)) - 1) & (v))
%% #define BSL(b, v, n) (MASK((b)-(n), (v)) << (n))
%% #define ROTL(b, v, n) (BSL((b), (v), (n)) | ((v) >> ((b)-(n))))
%%
%% uint64_t s[2];
%%
%% uint64_t next(void) {
%% uint64_t s1 = s[0];
%% const uint64_t s0 = s[1];
%%
%% s1 ^= BSL(58, s1, 24); // a
%% s1 ^= s0 ^ (s1 >> 11) ^ (s0 >> 41); // b, c
%% s[0] = s0;
%% s[1] = s1;
%%
%% const uint64_t result_plus = MASK(58, s0 + s1);
%% uint64_t result_starstar = s0;
%% result_starstar = MASK(58, result_starstar * 5);
%% result_starstar = ROTL(58, result_starstar, 7);
%% result_starstar = MASK(58, result_starstar * 9);
%%
%% return result_plus;
%% return result_starstar;
%% }
%%
%% =====================================================================
-opaque exsplus_state() :: nonempty_improper_list(uint58(), uint58()).
-dialyzer({no_improper_lists, exsplus_seed/1}).
exsplus_seed(L) when is_list(L) ->
[S0,S1] = seed58_nz(2, L),
[S0|S1];
exsplus_seed(X) when is_integer(X) ->
[S0,S1] = seed58(2, ?MASK(64, X)),
[S0|S1];
%%
%% Traditional integer triplet seed
exsplus_seed({A1, A2, A3}) ->
{_, R1} = exsplus_next(
[?MASK(58, (A1 * 4294967197) + 1)|
?MASK(58, (A2 * 4294967231) + 1)]),
{_, R2} = exsplus_next(
[?MASK(58, (A3 * 4294967279) + 1)|
tl(R1)]),
R2.
-dialyzer({no_improper_lists, exsss_seed/1}).
exsss_seed(L) when is_list(L) ->
[S0,S1] = seed58_nz(2, L),
[S0|S1];
exsss_seed(X) when is_integer(X) ->
[S0,S1] = seed58(2, ?MASK(64, X)),
[S0|S1];
%%
%% Seed from traditional integer triple - mix into splitmix
exsss_seed({A1, A2, A3}) ->
{_, X0} = seed58(?MASK(64, A1)),
{S0, X1} = seed58(?MASK(64, A2) bxor X0),
{S1, _} = seed58(?MASK(64, A3) bxor X1),
[S0|S1].
%% Advance Xorshift116 state one step
-define(
exs_next(S0, S1, S1_b),
begin
S1_b = S1 bxor ?BSL(58, S1, 24),
S1_b bxor S0 bxor (S1_b bsr 11) bxor (S0 bsr 41)
end).
-define(
scramble_starstar(S, V_a, V_b),
begin
%% The multiply by add shifted trick avoids creating bignums
%% which improves performance significantly
%%
V_a = ?MASK(58, S + ?BSL(58, S, 2)), % V_a = S * 5
V_b = ?ROTL(58, V_a, 7),
?MASK(58, V_b + ?BSL(58, V_b, 3)) % V_b * 9
end).
-dialyzer({no_improper_lists, exsplus_next/1}).
%% Advance state and generate 58bit unsigned integer
-spec exsplus_next(exsplus_state()) -> {uint58(), exsplus_state()}.
exsplus_next([S1|S0]) ->
%% Note: members s0 and s1 are swapped here
NewS1 = ?exs_next(S0, S1, S1_1),
{?MASK(58, S0 + NewS1), [S0|NewS1]}.
%% %% Note: members s0 and s1 are swapped here
%% S11 = S1 bxor ?BSL(58, S1, 24),
%% S12 = S11 bxor S0 bxor (S11 bsr 11) bxor (S0 bsr 41),
%% {?MASK(58, S0 + S12), [S0|S12]}.
-dialyzer({no_improper_lists, exsss_next/1}).
-spec exsss_next(exsplus_state()) -> {uint58(), exsplus_state()}.
exsss_next([S1|S0]) ->
%% Note: members s0 and s1 are swapped here
NewS1 = ?exs_next(S0, S1, S1_1),
{?scramble_starstar(S0, V_0, V_1), [S0|NewS1]}.
%% {?MASK(58, S0 + NewS1), [S0|NewS1]}.
exsp_uniform({Alg, R0}) ->
{I, R1} = exsplus_next(R0),
%% Waste the lowest bit since it is of lower
%% randomness quality than the others
{(I bsr (58-53)) * ?TWO_POW_MINUS53, {Alg, R1}}.
exsss_uniform({Alg, R0}) ->
{I, R1} = exsss_next(R0),
{(I bsr (58-53)) * ?TWO_POW_MINUS53, {Alg, R1}}.
exsp_uniform(Range, {Alg, R}) ->
{V, R1} = exsplus_next(R),
MaxMinusRange = ?BIT(58) - Range,
?uniform_range(Range, Alg, R1, V, MaxMinusRange, I).
exsss_uniform(Range, {Alg, R}) ->
{V, R1} = exsss_next(R),
MaxMinusRange = ?BIT(58) - Range,
?uniform_range(Range, Alg, R1, V, MaxMinusRange, I).
%% This is the jump function for the exs* generators,
%% i.e the Xorshift116 generators, equivalent
%% to 2^64 calls to next/1; it can be used to generate 2^52
%% non-overlapping subsequences for parallel computations.
%% Note: the jump function takes 116 times of the execution time of
%% next/1.
%%
%% #include <stdint.h>
%%
%% void jump(void) {
%% static const uint64_t JUMP[] = { 0x02f8ea6bc32c797,
%% 0x345d2a0f85f788c };
%% int i, b;
%% uint64_t s0 = 0;
%% uint64_t s1 = 0;
%% for(i = 0; i < sizeof JUMP / sizeof *JUMP; i++)
%% for(b = 0; b < 58; b++) {
%% if (JUMP[i] & 1ULL << b) {
%% s0 ^= s[0];
%% s1 ^= s[1];
%% }
%% next();
%% }
%% s[0] = s0;
%% s[1] = s1;
%% }
%%
%% -define(JUMPCONST, 16#000d174a83e17de2302f8ea6bc32c797).
%% split into 58-bit chunks
%% and two iterative executions
-define(JUMPCONST1, 16#02f8ea6bc32c797).
-define(JUMPCONST2, 16#345d2a0f85f788c).
-define(JUMPELEMLEN, 58).
-dialyzer({no_improper_lists, exsplus_jump/1}).
-spec exsplus_jump({alg_handler(), exsplus_state()}) ->
{alg_handler(), exsplus_state()}.
exsplus_jump({Alg, S}) ->
{S1, AS1} = exsplus_jump(S, [0|0], ?JUMPCONST1, ?JUMPELEMLEN),
{_, AS2} = exsplus_jump(S1, AS1, ?JUMPCONST2, ?JUMPELEMLEN),
{Alg, AS2}.
-dialyzer({no_improper_lists, exsplus_jump/4}).
exsplus_jump(S, AS, _, 0) ->
{S, AS};
exsplus_jump(S, [AS0|AS1], J, N) ->
{_, NS} = exsplus_next(S),
case ?MASK(1, J) of
1 ->
[S0|S1] = S,
exsplus_jump(NS, [(AS0 bxor S0)|(AS1 bxor S1)], J bsr 1, N-1);
0 ->
exsplus_jump(NS, [AS0|AS1], J bsr 1, N-1)
end.
%% =====================================================================
%% exs1024 PRNG: Xorshift1024*
%% Algorithm by Sebastiano Vigna
%% Reference URL: http://xorshift.di.unimi.it/
%% =====================================================================
-opaque exs1024_state() :: {list(uint64()), list(uint64())}.
exs1024_seed(L) when is_list(L) ->
{seed64_nz(16, L), []};
exs1024_seed(X) when is_integer(X) ->
{seed64(16, ?MASK(64, X)), []};
%%
%% Seed from traditional triple, remain backwards compatible
exs1024_seed({A1, A2, A3}) ->
B1 = ?MASK(21, (?MASK(21, A1) + 1) * 2097131),
B2 = ?MASK(21, (?MASK(21, A2) + 1) * 2097133),
B3 = ?MASK(21, (?MASK(21, A3) + 1) * 2097143),
{exs1024_gen1024((B1 bsl 43) bor (B2 bsl 22) bor (B3 bsl 1) bor 1),
[]}.
%% Generate a list of 16 64-bit element list
%% of the xorshift64* random sequence
%% from a given 64-bit seed.
%% Note: dependent on exs64_next/1
-spec exs1024_gen1024(uint64()) -> list(uint64()).
exs1024_gen1024(R) ->
exs1024_gen1024(16, R, []).
exs1024_gen1024(0, _, L) ->
L;
exs1024_gen1024(N, R, L) ->
{X, R2} = exs64_next(R),
exs1024_gen1024(N - 1, R2, [X|L]).
%% Calculation of xorshift1024*.
%% exs1024_calc(S0, S1) -> {X, NS1}.
%% X: random number output
-spec exs1024_calc(uint64(), uint64()) -> {uint64(), uint64()}.
exs1024_calc(S0, S1) ->
S11 = S1 bxor ?BSL(64, S1, 31),
S12 = S11 bxor (S11 bsr 11),
S01 = S0 bxor (S0 bsr 30),
NS1 = S01 bxor S12,
{?MASK(64, NS1 * 1181783497276652981), NS1}.
%% Advance xorshift1024* state for one step and generate 64bit unsigned integer
-spec exs1024_next(exs1024_state()) -> {uint64(), exs1024_state()}.
exs1024_next({[S0,S1|L3], RL}) ->
{X, NS1} = exs1024_calc(S0, S1),
{X, {[NS1|L3], [S0|RL]}};
exs1024_next({[H], RL}) ->
NL = [H|lists:reverse(RL)],
exs1024_next({NL, []}).
%% This is the jump function for the exs1024 generator, equivalent
%% to 2^512 calls to next(); it can be used to generate 2^512
%% non-overlapping subsequences for parallel computations.
%% Note: the jump function takes ~2000 times of the execution time of
%% next/1.
%% Jump constant here split into 58 bits for speed
-define(JUMPCONSTHEAD, 16#00242f96eca9c41d).
-define(JUMPCONSTTAIL,
[16#0196e1ddbe5a1561,
16#0239f070b5837a3c,
16#03f393cc68796cd2,
16#0248316f404489af,
16#039a30088bffbac2,
16#02fea70dc2d9891f,
16#032ae0d9644caec4,
16#0313aac17d8efa43,
16#02f132e055642626,
16#01ee975283d71c93,
16#00552321b06f5501,
16#00c41d10a1e6a569,
16#019158ecf8aa1e44,
16#004e9fc949d0b5fc,
16#0363da172811fdda,
16#030e38c3b99181f2,
16#0000000a118038fc]).
-define(JUMPTOTALLEN, 1024).
-define(RINGLEN, 16).
-spec exs1024_jump({alg_handler(), exs1024_state()}) ->
{alg_handler(), exs1024_state()}.
exs1024_jump({Alg, {L, RL}}) ->
P = length(RL),
AS = exs1024_jump({L, RL},
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
?JUMPCONSTTAIL, ?JUMPCONSTHEAD, ?JUMPELEMLEN, ?JUMPTOTALLEN),
{ASL, ASR} = lists:split(?RINGLEN - P, AS),
{Alg, {ASL, lists:reverse(ASR)}}.
exs1024_jump(_, AS, _, _, _, 0) ->
AS;
exs1024_jump(S, AS, [H|T], _, 0, TN) ->
exs1024_jump(S, AS, T, H, ?JUMPELEMLEN, TN);
exs1024_jump({L, RL}, AS, JL, J, N, TN) ->
{_, NS} = exs1024_next({L, RL}),
case ?MASK(1, J) of
1 ->
AS2 = lists:zipwith(fun(X, Y) -> X bxor Y end,
AS, L ++ lists:reverse(RL)),
exs1024_jump(NS, AS2, JL, J bsr 1, N-1, TN-1);
0 ->
exs1024_jump(NS, AS, JL, J bsr 1, N-1, TN-1)
end.
%% =====================================================================
%% exro928ss PRNG: Xoroshiro928**
%%
%% Reference URL: http://vigna.di.unimi.it/ftp/papers/ScrambledLinear.pdf
%% i.e the Xoroshiro1024 generator with ** scrambler
%% with {S, R, T} = {5, 7, 9} as recommended in the paper.
%%
%% {A, B, C} were tried out and selected as {44, 9, 45}
%% and the jump coefficients calculated.
%%
%% Standard jump function pseudocode:
%%
%% Jump constant j = 0xb10773cb...44085302f77130ca
%% Generator state: s
%% New generator state: t = 0
%% foreach bit in j, low to high:
%% if the bit is one:
%% t ^= s
%% next s
%% s = t
%%
%% Generator used for reference value calculation:
%%
%% #include <stdint.h>
%% #include <stdio.h>
%%
%% int p = 0;
%% uint64_t s[16];
%%
%% #define MASK(x) ((x) & ((UINT64_C(1) << 58) - 1))
%% static __inline uint64_t rotl(uint64_t x, int n) {
%% return MASK(x << n) | (x >> (58 - n));
%% }
%%
%% uint64_t next() {
%% const int q = p;
%% const uint64_t s0 = s[p = (p + 1) & 15];
%% uint64_t s15 = s[q];
%%
%% const uint64_t result_starstar = MASK(rotl(MASK(s0 * 5), 7) * 9);
%%
%% s15 ^= s0;
%% s[q] = rotl(s0, 44) ^ s15 ^ MASK(s15 << 9);
%% s[p] = rotl(s15, 45);
%%
%% return result_starstar;
%% }
%%
%% static const uint64_t jump_2pow512[15] =
%% { 0x44085302f77130ca, 0xba05381fdfd14902, 0x10a1de1d7d6813d2,
%% 0xb83fe51a1eb3be19, 0xa81b0090567fd9f0, 0x5ac26d5d20f9b49f,
%% 0x4ddd98ee4be41e01, 0x0657e19f00d4b358, 0xf02f778573cf0f0a,
%% 0xb45a3a8a3cef3cc0, 0x6e62a33cc2323831, 0xbcb3b7c4cc049c53,
%% 0x83f240c6007e76ce, 0xe19f5fc1a1504acd, 0x00000000b10773cb };
%%
%% static const uint64_t jump_2pow20[15] =
%% { 0xbdb966a3daf905e6, 0x644807a56270cf78, 0xda90f4a806c17e9e,
%% 0x4a426866bfad3c77, 0xaf699c306d8e7566, 0x8ebc73c700b8b091,
%% 0xc081a7bf148531fb, 0xdc4d3af15f8a4dfd, 0x90627c014098f4b6,
%% 0x06df2eb1feaf0fb6, 0x5bdeb1a5a90f2e6b, 0xa480c5878c3549bd,
%% 0xff45ef33c82f3d48, 0xa30bebc15fefcc78, 0x00000000cb3d181c };
%%
%% void jump(const uint64_t *jump) {
%% uint64_t j, t[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
%% int m, n, k;
%% for (m = 0; m < 15; m++, jump++) {
%% for (n = 0, j = *jump; n < 64; n++, j >>= 1) {
%% if ((j & 1) != 0) {
%% for (k = 0; k < 16; k++) {
%% t[k] ^= s[(p + k) & 15];
%% }
%% }
%% next();
%% }
%% }
%% for (k = 0; k < 16; k++) {
%% s[(p + k) & 15] = t[k];
%% }
%% }
%%
%% =====================================================================
-opaque exro928_state() :: {list(uint58()), list(uint58())}.
-spec exro928_seed(
list(uint58()) | integer() | {integer(), integer(), integer()}) ->
exro928_state().
exro928_seed(L) when is_list(L) ->
{seed58_nz(16, L), []};
exro928_seed(X) when is_integer(X) ->
{seed58(16, ?MASK(64, X)), []};
%%
%% Seed from traditional integer triple - mix into splitmix
exro928_seed({A1, A2, A3}) ->
{S0, X0} = seed58(?MASK(64, A1)),
{S1, X1} = seed58(?MASK(64, A2) bxor X0),
{S2, X2} = seed58(?MASK(64, A3) bxor X1),
{[S0,S1,S2|seed58(13, X2)], []}.
%% Update the state and calculate output word
-spec exro928ss_next(exro928_state()) -> {uint58(), exro928_state()}.
exro928ss_next({[S15,S0|Ss], Rs}) ->
SR = exro928_next_state(Ss, Rs, S15, S0),
%%
%% {S, R, T} = {5, 7, 9}
%% const uint64_t result_starstar = rotl(s0 * S, R) * T;
%%
{?scramble_starstar(S0, V_0, V_1), SR};
%% %% The multiply by add shifted trick avoids creating bignums
%% %% which improves performance significantly
%% %%
%% V0 = ?MASK(58, S0 + ?BSL(58, S0, 2)), % V0 = S0 * 5
%% V1 = ?ROTL(58, V0, 7),
%% V = ?MASK(58, V1 + ?BSL(58, V1, 3)), % V = V1 * 9
%% {V, SR};
exro928ss_next({[S15], Rs}) ->
exro928ss_next({[S15|lists:reverse(Rs)], []}).
-spec exro928_next(exro928_state()) -> {{uint58(),uint58()}, exro928_state()}.
exro928_next({[S15,S0|Ss], Rs}) ->
SR = exro928_next_state(Ss, Rs, S15, S0),
{{S15,S0}, SR};
exro928_next({[S15], Rs}) ->
exro928_next({[S15|lists:reverse(Rs)], []}).
%% Just update the state
-spec exro928_next_state(exro928_state()) -> exro928_state().
exro928_next_state({[S15,S0|Ss], Rs}) ->
exro928_next_state(Ss, Rs, S15, S0);
exro928_next_state({[S15], Rs}) ->
[S0|Ss] = lists:reverse(Rs),
exro928_next_state(Ss, [], S15, S0).
exro928_next_state(Ss, Rs, S15, S0) ->
%% {A, B, C} = {44, 9, 45},
%% s15 ^= s0;
%% NewS15: s[q] = rotl(s0, A) ^ s15 ^ (s15 << B);
%% NewS0: s[p] = rotl(s15, C);
%%
Q = S15 bxor S0,
NewS15 = ?ROTL(58, S0, 44) bxor Q bxor ?BSL(58, Q, 9),
NewS0 = ?ROTL(58, Q, 45),
{[NewS0|Ss], [NewS15|Rs]}.
exro928ss_uniform({Alg, SR}) ->
{V, NewSR} = exro928ss_next(SR),
{(V bsr (58-53)) * ?TWO_POW_MINUS53, {Alg, NewSR}}.
exro928ss_uniform(Range, {Alg, SR}) ->
{V, NewSR} = exro928ss_next(SR),
MaxMinusRange = ?BIT(58) - Range,
?uniform_range(Range, Alg, NewSR, V, MaxMinusRange, I).
-spec exro928_jump({alg_handler(), exro928_state()}) ->
{alg_handler(), exro928_state()}.
exro928_jump({Alg, SR}) ->
{Alg,exro928_jump_2pow512(SR)}.
-spec exro928_jump_2pow512(exro928_state()) -> exro928_state().
exro928_jump_2pow512(SR) ->
polyjump(
SR, fun exro928_next_state/1,
%% 2^512
[16#4085302F77130CA, 16#54E07F7F4524091,
16#5E1D7D6813D2BA0, 16#4687ACEF8644287,
16#4567FD9F0B83FE5, 16#43E6D27EA06C024,
16#641E015AC26D5D2, 16#6CD61377663B92F,
16#70A0657E19F00D4, 16#43C0BDDE15CF3C3,
16#745A3A8A3CEF3CC, 16#58A8CF308C8E0C6,
16#7B7C4CC049C536E, 16#431801F9DB3AF2C,
16#41A1504ACD83F24, 16#6C41DCF2F867D7F]).
-spec exro928_jump_2pow20(exro928_state()) -> exro928_state().
exro928_jump_2pow20(SR) ->
polyjump(
SR, fun exro928_next_state/1,
%% 2^20
[16#5B966A3DAF905E6, 16#601E9589C33DE2F,
16#74A806C17E9E644, 16#59AFEB4F1DF6A43,
16#46D8E75664A4268, 16#42E2C246BDA670C,
16#4531FB8EBC73C70, 16#537F702069EFC52,
16#4B6DC4D3AF15F8A, 16#5A4189F0050263D,
16#46DF2EB1FEAF0FB, 16#77AC696A43CB9AC,
16#4C5878C3549BD5B, 16#7CCF20BCF522920,
16#415FEFCC78FF45E, 16#72CF460728C2FAF]).
%% =====================================================================
%% exrop PRNG: Xoroshiro116+
%%
%% Reference URL: http://xorshift.di.unimi.it/
%%
%% 58 bits fits into an immediate on 64bits Erlang and is thus much faster.
%% In fact, an immediate number is 60 bits signed in Erlang so you can
%% add two positive 58 bit numbers and get a 59 bit number that still is
%% a positive immediate, which is a property we utilize here...
%%
%% Modification of the original Xororhiro128+ algorithm to 116 bits
%% by Sebastiano Vigna. A lot of thanks for his help and work.
%% =====================================================================
%% (a, b, c) = (24, 2, 35)
%% JUMP Polynomial = 0x9863200f83fcd4a11293241fcb12a (116 bit)
%%
%% From http://xoroshiro.di.unimi.it/xoroshiro116plus.c:
%% ---------------------------------------------------------------------
%% /* Written in 2017 by Sebastiano Vigna ([email protected]).
%%
%% To the extent possible under law, the author has dedicated all copyright
%% and related and neighboring rights to this software to the public domain
%% worldwide. This software is distributed without any warranty.
%%
%% See <http://creativecommons.org/publicdomain/zero/1.0/>. */
%%
%% #include <stdint.h>
%%
%% #define UINT58MASK (uint64_t)((UINT64_C(1) << 58) - 1)
%%
%% uint64_t s[2];
%%
%% static inline uint64_t rotl58(const uint64_t x, int k) {
%% return (x << k) & UINT58MASK | (x >> (58 - k));
%% }
%%
%% uint64_t next(void) {
%% uint64_t s1 = s[1];
%% const uint64_t s0 = s[0];
%% const uint64_t result = (s0 + s1) & UINT58MASK;
%%
%% s1 ^= s0;
%% s[0] = rotl58(s0, 24) ^ s1 ^ ((s1 << 2) & UINT58MASK); // a, b
%% s[1] = rotl58(s1, 35); // c
%% return result;
%% }
%%
%% void jump(void) {
%% static const uint64_t JUMP[] =
%% { 0x4a11293241fcb12a, 0x0009863200f83fcd };
%%
%% uint64_t s0 = 0;
%% uint64_t s1 = 0;
%% for(int i = 0; i < sizeof JUMP / sizeof *JUMP; i++)
%% for(int b = 0; b < 64; b++) {
%% if (JUMP[i] & UINT64_C(1) << b) {
%% s0 ^= s[0];
%% s1 ^= s[1];
%% }
%% next();
%% }
%% s[0] = s0;
%% s[1] = s1;
%% }
-opaque exrop_state() :: nonempty_improper_list(uint58(), uint58()).
-dialyzer({no_improper_lists, exrop_seed/1}).
exrop_seed(L) when is_list(L) ->
[S0,S1] = seed58_nz(2, L),
[S0|S1];
exrop_seed(X) when is_integer(X) ->
[S0,S1] = seed58(2, ?MASK(64, X)),
[S0|S1];
%%
%% Traditional integer triplet seed
exrop_seed({A1, A2, A3}) ->
[_|S1] =
exrop_next_s(
?MASK(58, (A1 * 4294967197) + 1),
?MASK(58, (A2 * 4294967231) + 1)),
exrop_next_s(?MASK(58, (A3 * 4294967279) + 1), S1).
-dialyzer({no_improper_lists, exrop_next_s/2}).
%% Advance xoroshiro116+ state one step
%% [a, b, c] = [24, 2, 35]
-define(
exrop_next_s(S0, S1, S1_a),
begin
S1_a = S1 bxor S0,
[?ROTL(58, S0, 24) bxor S1_a bxor ?BSL(58, S1_a, 2)| % a, b
?ROTL(58, S1_a, 35)] % c
end).
exrop_next_s(S0, S1) ->
?exrop_next_s(S0, S1, S1_a).
-dialyzer({no_improper_lists, exrop_next/1}).
%% Advance xoroshiro116+ state one step, generate 58 bit unsigned integer,
%% and waste the lowest bit since it is of lower randomness quality
exrop_next([S0|S1]) ->
{?MASK(58, S0 + S1), ?exrop_next_s(S0, S1, S1_a)}.
exrop_uniform({Alg, R}) ->
{V, R1} = exrop_next(R),
%% Waste the lowest bit since it is of lower
%% randomness quality than the others
{(V bsr (58-53)) * ?TWO_POW_MINUS53, {Alg, R1}}.
exrop_uniform(Range, {Alg, R}) ->
{V, R1} = exrop_next(R),
MaxMinusRange = ?BIT(58) - Range,
?uniform_range(Range, Alg, R1, V, MaxMinusRange, I).
%% Split a 116 bit constant into two 58 bit words,
%% a top '1' marks the end of the low word.
-define(
JUMP_116(Jump),
[?BIT(58) bor ?MASK(58, (Jump)),(Jump) bsr 58]).
%%
exrop_jump({Alg,S}) ->
[J|Js] = ?JUMP_116(16#9863200f83fcd4a11293241fcb12a),
{Alg, exrop_jump(S, 0, 0, J, Js)}.
%%
-dialyzer({no_improper_lists, exrop_jump/5}).
exrop_jump(_S, S0, S1, 0, []) -> % End of jump constant
[S0|S1];
exrop_jump(S, S0, S1, 1, [J|Js]) -> % End of word
exrop_jump(S, S0, S1, J, Js);
exrop_jump([S__0|S__1] = _S, S0, S1, J, Js) ->
case ?MASK(1, J) of
1 ->
NewS = exrop_next_s(S__0, S__1),
exrop_jump(NewS, S0 bxor S__0, S1 bxor S__1, J bsr 1, Js);
0 ->
NewS = exrop_next_s(S__0, S__1),
exrop_jump(NewS, S0, S1, J bsr 1, Js)
end.
%% =====================================================================
%% Mask and fill state list, ensure not all zeros
%% =====================================================================
seed58_nz(N, Ss) ->
seed_nz(N, Ss, 58, false).
seed64_nz(N, Ss) ->
seed_nz(N, Ss, 64, false).
seed_nz(_N, [], _M, false) ->
erlang:error(zero_seed);
seed_nz(0, [_|_], _M, _NZ) ->
erlang:error(too_many_seed_integers);
seed_nz(0, [], _M, _NZ) ->
[];
seed_nz(N, [], M, true) ->
[0|seed_nz(N - 1, [], M, true)];
seed_nz(N, [S|Ss], M, NZ) ->
if
is_integer(S) ->
R = ?MASK(M, S),
[R|seed_nz(N - 1, Ss, M, NZ orelse R =/= 0)];
true ->
erlang:error(non_integer_seed)
end.
%% =====================================================================
%% Splitmix seeders, lowest bits of SplitMix64, zeros skipped
%% =====================================================================
-spec seed58(non_neg_integer(), uint64()) -> list(uint58()).
seed58(0, _X) ->
[];
seed58(N, X) ->
{Z,NewX} = seed58(X),
[Z|seed58(N - 1, NewX)].
%%
seed58(X_0) ->
{Z0,X} = splitmix64_next(X_0),
case ?MASK(58, Z0) of
0 ->
seed58(X);
Z ->
{Z,X}
end.
-spec seed64(non_neg_integer(), uint64()) -> list(uint64()).
seed64(0, _X) ->
[];
seed64(N, X) ->
{Z,NewX} = seed64(X),
[Z|seed64(N - 1, NewX)].
%%
seed64(X_0) ->
{Z,X} = ZX = splitmix64_next(X_0),
if
Z =:= 0 ->
seed64(X);
true ->
ZX
end.
%% The SplitMix64 generator:
%%
%% uint64_t splitmix64_next() {
%% uint64_t z = (x += 0x9e3779b97f4a7c15);
%% z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
%% z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
%% return z ^ (z >> 31);
%% }
%%
splitmix64_next(X_0) ->
X = ?MASK(64, X_0 + 16#9e3779b97f4a7c15),
Z_0 = ?MASK(64, (X bxor (X bsr 30)) * 16#bf58476d1ce4e5b9),
Z_1 = ?MASK(64, (Z_0 bxor (Z_0 bsr 27)) * 16#94d049bb133111eb),
{?MASK(64, Z_1 bxor (Z_1 bsr 31)),X}.
%% =====================================================================
%% Polynomial jump with a jump constant word list,
%% high bit in each word marking top of word,
%% SR is a {Forward, Reverse} queue tuple with Forward never empty
%% =====================================================================
polyjump({Ss, Rs} = SR, NextState, JumpConst) ->
%% Create new state accumulator T
Ts = lists:duplicate(length(Ss) + length(Rs), 0),
polyjump(SR, NextState, JumpConst, Ts).
%%
%% Foreach jump word
polyjump(_SR, _NextState, [], Ts) ->
%% Return new calculated state
{Ts, []};
polyjump(SR, NextState, [J|Js], Ts) ->
polyjump(SR, NextState, Js, Ts, J).
%%
%% Foreach bit in jump word until top bit
polyjump(SR, NextState, Js, Ts, 1) ->
polyjump(SR, NextState, Js, Ts);
polyjump({Ss, Rs} = SR, NextState, Js, Ts, J) when J =/= 0 ->
NewSR = NextState(SR),
NewJ = J bsr 1,
case ?MASK(1, J) of
0 ->
polyjump(NewSR, NextState, Js, Ts, NewJ);
1 ->
%% Xor this state onto T
polyjump(NewSR, NextState, Js, xorzip_sr(Ts, Ss, Rs), NewJ)
end.
xorzip_sr([], [], undefined) ->
[];
xorzip_sr(Ts, [], Rs) ->
xorzip_sr(Ts, lists:reverse(Rs), undefined);
xorzip_sr([T|Ts], [S|Ss], Rs) ->
[T bxor S|xorzip_sr(Ts, Ss, Rs)].
%% =====================================================================
format_jumpconst58(String) ->
ReOpts = [{newline,any},{capture,all_but_first,binary},global],
{match,Matches} = re:run(String, "0x([a-zA-Z0-9]+)", ReOpts),
format_jumcons58_matches(lists:reverse(Matches), 0).
format_jumcons58_matches([], J) ->
format_jumpconst58_value(J);
format_jumcons58_matches([[Bin]|Matches], J) ->
NewJ = (J bsl 64) bor binary_to_integer(Bin, 16),
format_jumcons58_matches(Matches, NewJ).
format_jumpconst58_value(0) ->
ok;
format_jumpconst58_value(J) ->
io:format("16#~s,~n", [integer_to_list(?MASK(58, J) bor ?BIT(58), 16)]),
format_jumpconst58_value(J bsr 58).
%% =====================================================================
%% Ziggurat cont
%% =====================================================================
-define(NOR_R, 3.6541528853610087963519472518).
-define(NOR_INV_R, 1/?NOR_R).
%% return a {sign, Random51bits, State}
get_52({Alg=#{bits:=Bits, next:=Next}, S0}) ->
%% Use the high bits
{Int,S1} = Next(S0),
{?BIT(Bits - 51 - 1) band Int, Int bsr (Bits - 51), {Alg, S1}};
get_52({Alg=#{next:=Next}, S0}) ->
{Int,S1} = Next(S0),
{?BIT(51) band Int, ?MASK(51, Int), {Alg, S1}}.
%% Slow path
normal_s(0, Sign, X0, State0) ->
{U0, S1} = uniform_s(State0),
X = -?NOR_INV_R*math:log(U0),
{U1, S2} = uniform_s(S1),
Y = -math:log(U1),
case Y+Y > X*X of
false ->
normal_s(0, Sign, X0, S2);
true when Sign =:= 0 ->
{?NOR_R + X, S2};
true ->
{-?NOR_R - X, S2}
end;
normal_s(Idx, _Sign, X, State0) ->
Fi2 = normal_fi(Idx+1),
{U0, S1} = uniform_s(State0),
case ((normal_fi(Idx) - Fi2)*U0 + Fi2) < math:exp(-0.5*X*X) of
true -> {X, S1};
false -> normal_s(S1)
end.
%% Tables for generating normal_s
%% ki is zipped with wi (slightly faster)
normal_kiwi(Indx) ->
element(Indx,
{{2104047571236786,1.736725412160263e-15}, {0,9.558660351455634e-17},
{1693657211986787,1.2708704834810623e-16},{1919380038271141,1.4909740962495474e-16},
{2015384402196343,1.6658733631586268e-16},{2068365869448128,1.8136120810119029e-16},
{2101878624052573,1.9429720153135588e-16},{2124958784102998,2.0589500628482093e-16},
{2141808670795147,2.1646860576895422e-16},{2154644611568301,2.2622940392218116e-16},
{2164744887587275,2.353271891404589e-16},{2172897953696594,2.438723455742877e-16},
{2179616279372365,2.5194879829274225e-16},{2185247251868649,2.5962199772528103e-16},
{2190034623107822,2.6694407473648285e-16},{2194154434521197,2.7395729685142446e-16},
{2197736978774660,2.8069646002484804e-16},{2200880740891961,2.871905890411393e-16},
{2203661538010620,2.9346417484728883e-16},{2206138681109102,2.9953809336782113e-16},
{2208359231806599,3.054303000719244e-16},{2210361007258210,3.111563633892157e-16},
{2212174742388539,3.1672988018581815e-16},{2213825672704646,3.2216280350549905e-16},
{2215334711002614,3.274657040793975e-16},{2216719334487595,3.326479811684171e-16},
{2217994262139172,3.377180341735323e-16},{2219171977965032,3.4268340353119356e-16},
{2220263139538712,3.475508873172976e-16},{2221276900117330,3.523266384600203e-16},
{2222221164932930,3.5701624633953494e-16},{2223102796829069,3.616248057159834e-16},
{2223927782546658,3.661569752965354e-16},{2224701368170060,3.7061702777236077e-16},
{2225428170204312,3.75008892787478e-16},{2226112267248242,3.7933619401549554e-16},
{2226757276105256,3.836022812967728e-16},{2227366415328399,3.8781025861250247e-16},
{2227942558554684,3.919630085325768e-16},{2228488279492521,3.9606321366256378e-16},
{2229005890047222,4.001133755254669e-16},{2229497472775193,4.041158312414333e-16},
{2229964908627060,4.080727683096045e-16},{2230409900758597,4.119862377480744e-16},
{2230833995044585,4.1585816580828064e-16},{2231238597816133,4.1969036444740733e-16},
{2231624991250191,4.234845407152071e-16},{2231994346765928,4.272423051889976e-16},
{2232347736722750,4.309651795716294e-16},{2232686144665934,4.346546035512876e-16},
{2233010474325959,4.383119410085457e-16},{2233321557544881,4.4193848564470665e-16},
{2233620161276071,4.455354660957914e-16},{2233906993781271,4.491040505882875e-16},
{2234182710130335,4.52645351185714e-16},{2234447917093496,4.561604276690038e-16},
{2234703177503020,4.596502910884941e-16},{2234949014150181,4.631159070208165e-16},
{2235185913274316,4.665581985600875e-16},{2235414327692884,4.699780490694195e-16},
{2235634679614920,4.733763047158324e-16},{2235847363174595,4.767537768090853e-16},
{2236052746716837,4.8011124396270155e-16},{2236251174862869,4.834494540935008e-16},
{2236442970379967,4.867691262742209e-16},{2236628435876762,4.900709524522994e-16},
{2236807855342765,4.933555990465414e-16},{2236981495548562,4.966237084322178e-16},
{2237149607321147,4.998759003240909e-16},{2237312426707209,5.031127730659319e-16},
{2237470176035652,5.0633490483427195e-16},{2237623064889403,5.095428547633892e-16},
{2237771290995388,5.127371639978797e-16},{2237915041040597,5.159183566785736e-16},
{2238054491421305,5.190869408670343e-16},{2238189808931712,5.222434094134042e-16},
{2238321151397660,5.253882407719454e-16},{2238448668260432,5.285218997682382e-16},
{2238572501115169,5.316448383216618e-16},{2238692784207942,5.34757496126473e-16},
{2238809644895133,5.378603012945235e-16},{2238923204068402,5.409536709623993e-16},
{2239033576548190,5.440380118655467e-16},{2239140871448443,5.471137208817361e-16},
{2239245192514958,5.501811855460336e-16},{2239346638439541,5.532407845392784e-16},
{2239445303151952,5.56292888151909e-16},{2239541276091442,5.593378587248462e-16},
{2239634642459498,5.623760510690043e-16},{2239725483455293,5.65407812864896e-16},
{2239813876495186,5.684334850436814e-16},{2239899895417494,5.714534021509204e-16},
{2239983610673676,5.744678926941961e-16},{2240065089506935,5.774772794756965e-16},
{2240144396119183,5.804818799107686e-16},{2240221591827230,5.834820063333892e-16},
{2240296735208969,5.864779662894365e-16},{2240369882240293,5.894700628185872e-16},
{2240441086423386,5.924585947256134e-16},{2240510398907004,5.95443856841806e-16},
{2240577868599305,5.984261402772028e-16},{2240643542273726,6.014057326642664e-16},
{2240707464668391,6.043829183936125e-16},{2240769678579486,6.073579788423606e-16},
{2240830224948980,6.103311925956439e-16},{2240889142947082,6.133028356617911e-16},
{2240946470049769,6.162731816816596e-16},{2241002242111691,6.192425021325847e-16},
{2241056493434746,6.222110665273788e-16},{2241109256832602,6.251791426088e-16},
{2241160563691400,6.281469965398895e-16},{2241210444026879,6.311148930905604e-16},
{2241258926538122,6.34083095820806e-16},{2241306038658137,6.370518672608815e-16},
{2241351806601435,6.400214690888025e-16},{2241396255408788,6.429921623054896e-16},
{2241439408989313,6.459642074078832e-16},{2241481290160038,6.489378645603397e-16},
{2241521920683062,6.519133937646159e-16},{2241561321300462,6.548910550287415e-16},
{2241599511767028,6.578711085350741e-16},{2241636510880960,6.608538148078259e-16},
{2241672336512612,6.638394348803506e-16},{2241707005631362,6.668282304624746e-16},
{2241740534330713,6.698204641081558e-16},{2241772937851689,6.728163993837531e-16},
{2241804230604585,6.758163010371901e-16},{2241834426189161,6.78820435168298e-16},
{2241863537413311,6.818290694006254e-16},{2241891576310281,6.848424730550038e-16},
{2241918554154466,6.878609173251664e-16},{2241944481475843,6.908846754557169e-16},
{2241969368073071,6.939140229227569e-16},{2241993223025298,6.969492376174829e-16},
{2242016054702685,6.999906000330764e-16},{2242037870775710,7.030383934552151e-16},
{2242058678223225,7.060929041565482e-16},{2242078483339331,7.091544215954873e-16},
{2242097291739040,7.122232386196779e-16},{2242115108362774,7.152996516745303e-16},
{2242131937479672,7.183839610172063e-16},{2242147782689725,7.214764709364707e-16},
{2242162646924736,7.245774899788387e-16},{2242176532448092,7.276873311814693e-16},
{2242189440853337,7.308063123122743e-16},{2242201373061537,7.339347561177405e-16},
{2242212329317416,7.370729905789831e-16},{2242222309184237,7.4022134917658e-16},
{2242231311537397,7.433801711647648e-16},{2242239334556717,7.465498018555889e-16},
{2242246375717369,7.497305929136979e-16},{2242252431779415,7.529229026624058e-16},
{2242257498775893,7.561270964017922e-16},{2242261571999416,7.5934354673958895e-16},
{2242264645987196,7.625726339356756e-16},{2242266714504453,7.658147462610487e-16},
{2242267770526109,7.690702803721919e-16},{2242267806216711,7.723396417018299e-16},
{2242266812908462,7.756232448671174e-16},{2242264781077289,7.789215140963852e-16},
{2242261700316818,7.822348836756411e-16},{2242257559310145,7.855637984161084e-16},
{2242252345799276,7.889087141441755e-16},{2242246046552082,7.922700982152271e-16},
{2242238647326615,7.956484300529366e-16},{2242230132832625,7.99044201715713e-16},
{2242220486690076,8.024579184921259e-16},{2242209691384458,8.058900995272657e-16},
{2242197728218684,8.093412784821501e-16},{2242184577261310,8.128120042284501e-16},
{2242170217290819,8.163028415809877e-16},{2242154625735679,8.198143720706533e-16},
{2242137778609839,8.23347194760605e-16},{2242119650443327,8.26901927108847e-16},
{2242100214207556,8.304792058805374e-16},{2242079441234906,8.340796881136629e-16},
{2242057301132135,8.377040521420222e-16},{2242033761687079,8.413529986798028e-16},
{2242008788768107,8.450272519724097e-16},{2241982346215682,8.487275610186155e-16},
{2241954395725356,8.524547008695596e-16},{2241924896721443,8.562094740106233e-16},
{2241893806220517,8.599927118327665e-16},{2241861078683830,8.638052762005259e-16},
{2241826665857598,8.676480611245582e-16},{2241790516600041,8.715219945473698e-16},
{2241752576693881,8.754280402517175e-16},{2241712788642916,8.793671999021043e-16},
{2241671091451078,8.833405152308408e-16},{2241627420382235,8.873490703813135e-16},
{2241581706698773,8.913939944224086e-16},{2241533877376767,8.954764640495068e-16},
{2241483854795281,8.9959770648911e-16},{2241431556397035,9.037590026260118e-16},
{2241376894317345,9.079616903740068e-16},{2241319774977817,9.122071683134846e-16},
{2241260098640860,9.164968996219135e-16},{2241197758920538,9.208324163262308e-16},
{2241132642244704,9.252153239095693e-16},{2241064627262652,9.296473063086417e-16},
{2240993584191742,9.341301313425265e-16},{2240919374095536,9.38665656618666e-16},
{2240841848084890,9.432558359676707e-16},{2240760846432232,9.479027264651738e-16},
{2240676197587784,9.526084961066279e-16},{2240587717084782,9.57375432209745e-16},
{2240495206318753,9.622059506294838e-16},{2240398451183567,9.671026058823054e-16},
{2240297220544165,9.720681022901626e-16},{2240191264522612,9.771053062707209e-16},
{2240080312570155,9.822172599190541e-16},{2239964071293331,9.874071960480671e-16},
{2239842221996530,9.926785548807976e-16},{2239714417896699,9.980350026183645e-16},
{2239580280957725,1.003480452143618e-15},{2239439398282193,1.0090190861637457e-15},
{2239291317986196,1.0146553831467086e-15},{2239135544468203,1.0203941464683124e-15},
{2238971532964979,1.0262405372613567e-15},{2238798683265269,1.0322001115486456e-15},
{2238616332424351,1.03827886235154e-15},{2238423746288095,1.044483267600047e-15},
{2238220109591890,1.0508203448355195e-15},{2238004514345216,1.057297713900989e-15},
{2237775946143212,1.06392366906768e-15},{2237533267957822,1.0707072623632994e-15},
{2237275200846753,1.0776584002668106e-15},{2237000300869952,1.0847879564403425e-15},
{2236706931309099,1.0921079038149563e-15},{2236393229029147,1.0996314701785628e-15},
{2236057063479501,1.1073733224935752e-15},{2235695986373246,1.1153497865853155e-15},
{2235307169458859,1.1235791107110833e-15},{2234887326941578,1.1320817840164846e-15},
{2234432617919447,1.140880924258278e-15},{2233938522519765,1.1500027537839792e-15},
{2233399683022677,1.159477189144919e-15},{2232809697779198,1.169338578691096e-15},
{2232160850599817,1.17962663529558e-15},{2231443750584641,1.190387629928289e-15},
{2230646845562170,1.2016759392543819e-15},{2229755753817986,1.2135560818666897e-15},
{2228752329126533,1.2261054417450561e-15},{2227613325162504,1.2394179789163251e-15},
{2226308442121174,1.2536093926602567e-15},{2224797391720399,1.268824481425501e-15},
{2223025347823832,1.2852479319096109e-15},{2220915633329809,1.3031206634689985e-15},
{2218357446087030,1.3227655770195326e-15},{2215184158448668,1.3446300925011171e-15},
{2211132412537369,1.3693606835128518e-15},{2205758503851065,1.397943667277524e-15},
{2198248265654987,1.4319989869661328e-15},{2186916352102141,1.4744848603597596e-15},
{2167562552481814,1.5317872741611144e-15},{2125549880839716,1.6227698675312968e-15}}).
normal_fi(Indx) ->
element(Indx,
{1.0000000000000000e+00,9.7710170126767082e-01,9.5987909180010600e-01,
9.4519895344229909e-01,9.3206007595922991e-01,9.1999150503934646e-01,
9.0872644005213032e-01,8.9809592189834297e-01,8.8798466075583282e-01,
8.7830965580891684e-01,8.6900868803685649e-01,8.6003362119633109e-01,
8.5134625845867751e-01,8.4291565311220373e-01,8.3471629298688299e-01,
8.2672683394622093e-01,8.1892919160370192e-01,8.1130787431265572e-01,
8.0384948317096383e-01,7.9654233042295841e-01,7.8937614356602404e-01,
7.8234183265480195e-01,7.7543130498118662e-01,7.6863731579848571e-01,
7.6195334683679483e-01,7.5537350650709567e-01,7.4889244721915638e-01,
7.4250529634015061e-01,7.3620759812686210e-01,7.2999526456147568e-01,
7.2386453346862967e-01,7.1781193263072152e-01,7.1183424887824798e-01,
7.0592850133275376e-01,7.0009191813651117e-01,6.9432191612611627e-01,
6.8861608300467136e-01,6.8297216164499430e-01,6.7738803621877308e-01,
6.7186171989708166e-01,6.6639134390874977e-01,6.6097514777666277e-01,
6.5561147057969693e-01,6.5029874311081637e-01,6.4503548082082196e-01,
6.3982027745305614e-01,6.3465179928762327e-01,6.2952877992483625e-01,
6.2445001554702606e-01,6.1941436060583399e-01,6.1442072388891344e-01,
6.0946806492577310e-01,6.0455539069746733e-01,5.9968175261912482e-01,
5.9484624376798689e-01,5.9004799633282545e-01,5.8528617926337090e-01,
5.8055999610079034e-01,5.7586868297235316e-01,5.7121150673525267e-01,
5.6658776325616389e-01,5.6199677581452390e-01,5.5743789361876550e-01,
5.5291049042583185e-01,5.4841396325526537e-01,5.4394773119002582e-01,
5.3951123425695158e-01,5.3510393238045717e-01,5.3072530440366150e-01,
5.2637484717168403e-01,5.2205207467232140e-01,5.1775651722975591e-01,
5.1348772074732651e-01,5.0924524599574761e-01,5.0502866794346790e-01,
5.0083757512614835e-01,4.9667156905248933e-01,4.9253026364386815e-01,
4.8841328470545758e-01,4.8432026942668288e-01,4.8025086590904642e-01,
4.7620473271950547e-01,4.7218153846772976e-01,4.6818096140569321e-01,
4.6420268904817391e-01,4.6024641781284248e-01,4.5631185267871610e-01,
4.5239870686184824e-01,4.4850670150720273e-01,4.4463556539573912e-01,
4.4078503466580377e-01,4.3695485254798533e-01,4.3314476911265209e-01,
4.2935454102944126e-01,4.2558393133802180e-01,4.2183270922949573e-01,
4.1810064983784795e-01,4.1438753404089090e-01,4.1069314827018799e-01,
4.0701728432947315e-01,4.0335973922111429e-01,3.9972031498019700e-01,
3.9609881851583223e-01,3.9249506145931540e-01,3.8890886001878855e-01,
3.8534003484007706e-01,3.8178841087339344e-01,3.7825381724561896e-01,
3.7473608713789086e-01,3.7123505766823922e-01,3.6775056977903225e-01,
3.6428246812900372e-01,3.6083060098964775e-01,3.5739482014578022e-01,
3.5397498080007656e-01,3.5057094148140588e-01,3.4718256395679348e-01,
3.4380971314685055e-01,3.4045225704452164e-01,3.3711006663700588e-01,
3.3378301583071823e-01,3.3047098137916342e-01,3.2717384281360129e-01,
3.2389148237639104e-01,3.2062378495690530e-01,3.1737063802991350e-01,
3.1413193159633707e-01,3.1090755812628634e-01,3.0769741250429189e-01,
3.0450139197664983e-01,3.0131939610080288e-01,2.9815132669668531e-01,
2.9499708779996164e-01,2.9185658561709499e-01,2.8872972848218270e-01,
2.8561642681550159e-01,2.8251659308370741e-01,2.7943014176163772e-01,
2.7635698929566810e-01,2.7329705406857691e-01,2.7025025636587519e-01,
2.6721651834356114e-01,2.6419576399726080e-01,2.6118791913272082e-01,
2.5819291133761890e-01,2.5521066995466168e-01,2.5224112605594190e-01,
2.4928421241852824e-01,2.4633986350126363e-01,2.4340801542275012e-01,
2.4048860594050039e-01,2.3758157443123795e-01,2.3468686187232990e-01,
2.3180441082433859e-01,2.2893416541468023e-01,2.2607607132238020e-01,
2.2323007576391746e-01,2.2039612748015194e-01,2.1757417672433113e-01,
2.1476417525117358e-01,2.1196607630703015e-01,2.0917983462112499e-01,
2.0640540639788071e-01,2.0364274931033485e-01,2.0089182249465656e-01,
1.9815258654577511e-01,1.9542500351413428e-01,1.9270903690358912e-01,
1.9000465167046496e-01,1.8731181422380025e-01,1.8463049242679927e-01,
1.8196065559952254e-01,1.7930227452284767e-01,1.7665532144373500e-01,
1.7401977008183875e-01,1.7139559563750595e-01,1.6878277480121151e-01,
1.6618128576448205e-01,1.6359110823236570e-01,1.6101222343751107e-01,
1.5844461415592431e-01,1.5588826472447920e-01,1.5334316106026283e-01,
1.5080929068184568e-01,1.4828664273257453e-01,1.4577520800599403e-01,
1.4327497897351341e-01,1.4078594981444470e-01,1.3830811644855071e-01,
1.3584147657125373e-01,1.3338602969166913e-01,1.3094177717364430e-01,
1.2850872227999952e-01,1.2608687022018586e-01,1.2367622820159654e-01,
1.2127680548479021e-01,1.1888861344290998e-01,1.1651166562561080e-01,
1.1414597782783835e-01,1.1179156816383801e-01,1.0944845714681163e-01,
1.0711666777468364e-01,1.0479622562248690e-01,1.0248715894193508e-01,
1.0018949876880981e-01,9.7903279038862284e-02,9.5628536713008819e-02,
9.3365311912690860e-02,9.1113648066373634e-02,8.8873592068275789e-02,
8.6645194450557961e-02,8.4428509570353374e-02,8.2223595813202863e-02,
8.0030515814663056e-02,7.7849336702096039e-02,7.5680130358927067e-02,
7.3522973713981268e-02,7.1377949058890375e-02,6.9245144397006769e-02,
6.7124653827788497e-02,6.5016577971242842e-02,6.2921024437758113e-02,
6.0838108349539864e-02,5.8767952920933758e-02,5.6710690106202902e-02,
5.4666461324888914e-02,5.2635418276792176e-02,5.0617723860947761e-02,
4.8613553215868521e-02,4.6623094901930368e-02,4.4646552251294443e-02,
4.2684144916474431e-02,4.0736110655940933e-02,3.8802707404526113e-02,
3.6884215688567284e-02,3.4980941461716084e-02,3.3093219458578522e-02,
3.1221417191920245e-02,2.9365939758133314e-02,2.7527235669603082e-02,
2.5705804008548896e-02,2.3902203305795882e-02,2.2117062707308864e-02,
2.0351096230044517e-02,1.8605121275724643e-02,1.6880083152543166e-02,
1.5177088307935325e-02,1.3497450601739880e-02,1.1842757857907888e-02,
1.0214971439701471e-02,8.6165827693987316e-03,7.0508754713732268e-03,
5.5224032992509968e-03,4.0379725933630305e-03,2.6090727461021627e-03,
1.2602859304985975e-03}).
%%%bitcount64(0) -> 0;
%%%bitcount64(V) -> 1 + bitcount(V, 64).
%%%
%%%-define(
%%% BITCOUNT(V, N),
%%% bitcount(V, N) ->
%%% if
%%% (1 bsl ((N) bsr 1)) =< (V) ->
%%% ((N) bsr 1) + bitcount((V) bsr ((N) bsr 1), ((N) bsr 1));
%%% true ->
%%% bitcount((V), ((N) bsr 1))
%%% end).
%%%?BITCOUNT(V, 64);
%%%?BITCOUNT(V, 32);
%%%?BITCOUNT(V, 16);
%%%?BITCOUNT(V, 8);
%%%?BITCOUNT(V, 4);
%%%?BITCOUNT(V, 2);
%%%bitcount(_, 1) -> 0.
bc64(V) -> ?BC(V, 64).
%% Linear from high bit - higher probability first gives faster execution
bc(V, B, N) when B =< V -> N;
bc(V, B, N) -> bc(V, B bsr 1, N - 1).
make_float(S, E, M) ->
<<F/float>> = <<S:1, E:11, M:52>>,
F.
float2str(N) ->
<<S:1, E:11, M:52>> = <<(float(N))/float>>,
lists:flatten(
io_lib:format(
"~c~c.~13.16.0bE~b",
[case S of 1 -> $-; 0 -> $+ end,
case E of 0 -> $0; _ -> $1 end,
M, E - 16#3ff])).
