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change stdlib-random function rtol to ishftc #714

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merged 2 commits into from May 14, 2023
Merged

change stdlib-random function rtol to ishftc #714

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5990aea
Update stdlib_random.fypp
Euler-37 May 14, 2023
967f63b
Update stdlib_random.fypp
Euler-37 May 14, 2023
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15 changes: 2 additions & 13 deletions src/stdlib_random.fypp
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Expand Up @@ -78,27 +78,16 @@ module stdlib_random
integer(int64) :: res, t

if(.not. seed_initialized) call random_distribution_seed_iint64(si,t)
res = rol64(st(2) * 5, 7) * 9
res = ishftc(st(2) * 5, 7) * 9
t = shiftl(st(2), 17)
st(3) = ieor(st(3), st(1))
st(4) = ieor(st(4), st(2))
st(2) = ieor(st(2), st(3))
st(1) = ieor(st(1), st(4))
st(3) = ieor(st(3), t)
st(4) = rol64(st(4), 45)
st(4) = ishftc(st(4), 45)
end function xoshiro256ss

pure function rol64(x, k) result(res)
integer(int64), intent(in) :: x
integer, intent(in) :: k
integer(int64) :: t1, t2, res

t1 = shiftr(x, (64 - k))
t2 = shiftl(x, k)
res = ior(t1, t2)
end function rol64


function splitmix64(s) result(res)
! Written in 2015 by Sebastiano Vigna (vigna@acm.org)
! This is a fixed-increment version of Java 8's SplittableRandom
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