mirror of
https://github.com/matrix-construct/construct
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40 lines
1.1 KiB
C++
40 lines
1.1 KiB
C++
// The Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2020 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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#pragma once
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#define HAVE_IRCD_PROF_CYCLES_H
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namespace ircd::prof
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{
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uint64_t cycles() noexcept;
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}
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namespace ircd
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{
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using prof::cycles;
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}
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/// Monotonic reference cycles (since system boot)
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extern inline uint64_t
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__attribute__((flatten, always_inline, gnu_inline, artificial))
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ircd::prof::cycles()
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noexcept
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{
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#if defined(__x86_64__) || defined(__i386__)
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return x86::rdtsc();
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#elif defined(__aarch64__)
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return arm::read_virtual_counter();
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#elif __has_builtin(__builtin_readcyclecounter)
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return __builtin_readcyclecounter();
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#else
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static_assert(false, "Select reference cycle counter for platform.");
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return 0;
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#endif
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}
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