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patch 8.1.2356: rand() does not use the best algorithm

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Problem:    rand() does not use the best algorithm.
Solution:   use xoshiro128** instead of xorshift. (Kaito Udagawa,
            closes #5279)
This commit is contained in:
Bram Moolenaar
2019-11-28 22:13:14 +01:00
parent c7d2a57b3a
commit f8c1f9200c
4 changed files with 80 additions and 67 deletions
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14
runtime/doc/eval.txt
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@@ -1,4 +1,4 @@
*eval.txt* For Vim version 8.1. Last change: 2019 Nov 25
*eval.txt* For Vim version 8.1. Last change: 2019 Nov 28
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -7641,7 +7641,7 @@ range({expr} [, {max} [, {stride}]]) *range()*
<
rand([{expr}]) *rand()*
Return a pseudo-random Number generated with an xorshift
Return a pseudo-random Number generated with an xoshiro128**
algorithm using seed {expr}. The returned number is 32 bits,
also on 64 bits systems, for consistency.
{expr} can be initialized by |srand()| and will be updated by
@@ -9150,11 +9150,11 @@ sqrt({expr}) *sqrt()*
srand([{expr}]) *srand()*
Initialize seed used by |rand()|:
- If {expr} is not given, seed values are initialized by
time(NULL) a.k.a. epoch time. This only has second
accuracy.
- If {expr} is given, return seed values which x element is
{expr}. This is useful for testing or when a predictable
sequence is expected.
reading from /dev/urandom, if possible, or using time(NULL)
a.k.a. epoch time otherwise; this only has second accuracy.
- If {expr} is given it must be a Number. It is used to
initialize the seed values. This is useful for testing or
when a predictable sequence is intended.
Examples: >
:let seed = srand()