mirror of
https://github.com/matrix-construct/construct
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46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
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// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2021 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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/// Generate the next pseudo-random 64-bit sequence from the 256-bit state
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/// and update the state for the next call.
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inline ulong
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ircd_simt_rand_xoshiro256p(ulong s[4])
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{
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const ulong
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ret = s[0] + s[3],
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ent = s[1] << 17;
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s[2] ^= s[0];
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s[3] ^= s[1];
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s[1] ^= s[3];
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s[0] ^= s[3];
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s[2] ^= ent;
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s[3] = rotate(s[3], 45UL); // (s[3] << 45) | (s[3] >> (64 - 45));
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return ret;
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}
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/// Generate the next pseudo-random 64-bit sequence from the 256-bit global
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/// state and update the state for the next call.
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inline ulong
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ircd_simt_rand_xoshiro256pg(__global ulong s[4])
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{
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ulong _s[4], ret;
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for(uint i = 0; i < 4; i++)
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_s[i] = s[i];
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ret = ircd_simt_rand_xoshiro256p(_s);
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for(uint i = 0; i < 4; i++)
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s[i] = _s[i];
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return ret;
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}
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