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authorRaimo Niskanen <[email protected]>2017-04-26 11:59:17 +0200
committerRaimo Niskanen <[email protected]>2017-04-26 11:59:17 +0200
commit418a06c1fa14d144abb95d6e2030e49d074cf6e6 (patch)
tree94b850136c185bdd16c844ffecbf390528e4e778 /lib/stdlib/src/rand.erl
parent998fdbd52c702cc354653a096279ce0841463b9f (diff)
parentee6137f8451bc2031299eda1b441ac72d14093c7 (diff)
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Merge branch 'raimo/rand-dev/OTP-14295'
* raimo/rand-dev/OTP-14295: Polish
Diffstat (limited to 'lib/stdlib/src/rand.erl')
-rw-r--r--lib/stdlib/src/rand.erl14
1 files changed, 7 insertions, 7 deletions
diff --git a/lib/stdlib/src/rand.erl b/lib/stdlib/src/rand.erl
index ab9731180f..7a8a5e6d4a 100644
--- a/lib/stdlib/src/rand.erl
+++ b/lib/stdlib/src/rand.erl
@@ -265,7 +265,7 @@ seed_s(Alg0, S0 = {_, _, _}) ->
%%% 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,
+%% uniform/0: returns a random float X where 0.0 =< X < 1.0,
%% updating the state in the process dictionary.
-spec uniform() -> X :: float().
@@ -285,7 +285,7 @@ uniform(N) ->
X.
%% uniform_s/1: given a state, uniform_s/1
-%% returns a random float X where 0.0 < X < 1.0,
+%% returns a random float X where 0.0 =< X < 1.0,
%% and a new state.
-spec uniform_s(State :: state()) -> {X :: float(), NewState :: state()}.
@@ -742,20 +742,20 @@ exrop_uniform(Range, {Alg, R}) ->
MaxMinusRange = ?BIT(58) - Range,
?uniform_range(Range, Alg, R1, V, MaxMinusRange, I).
-%% Split a 116 bit constant into two '1'++58 bit words,
-%% the top '1' marks the top of the word
+%% 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)),?BIT(58) bor ((Jump) bsr 58)]).
+ [?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, 1, []) -> % End of jump constant
+exrop_jump(_S, S0, S1, 0, []) -> % End of jump constant
[S0|S1];
-exrop_jump(S, S0, S1, 1, [J|Js]) -> % End of the word
+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