karina
19 lines
444 B
C
19 lines
444 B
C
#pragma once
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#include <Types.h>
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#include <Arch/Timer.h>
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enum {
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kRandSeed = 0x9E3779B97F4A7C15ULL,
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kRandMultiplier = 0xBF58476D1CE4E5B9ULL,
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kRandIncrement = 0x94D049BB133111EBULL,
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};
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static inline UInt64 Rand() {
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static _Atomic UInt64 sequence = 0;
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UInt64 z = (TimerGetCounter() + kRandSeed + (++sequence));
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z = (z ^ (z >> 30)) * kRandMultiplier;
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z = (z ^ (z >> 27)) * kRandIncrement;
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return z ^ (z >> 31);
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}
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