2017-11-20 19:17:49 +00:00
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#pragma once
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#ifdef _MSC_VER
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# include <intrin.h>
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# define LIKELY(x) (x)
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# define UNLIKELY(x) (x)
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# define EIGHTBIT_PARITY(x) (__popcnt(value) % 2)
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# define UNREACHABLE __assume(0)
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2017-11-20 20:54:17 +00:00
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#elif defined(__GNUG__)
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2017-11-20 19:17:49 +00:00
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# include <x86intrin.h>
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# define LIKELY(x) __builtin_expect(!!(x), 1)
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# define UNLIKELY(x) __builtin_expect(!!(x), 0)
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# define EIGHTBIT_PARITY(x) __builtin_parity(value)
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# define UNREACHABLE __builtin_unreachable();
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#else
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# error Unknown compiler
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#endif
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