mirror of https://github.com/OpenRCT2/OpenRCT2.git
35 lines
1.6 KiB
C
35 lines
1.6 KiB
C
/*****************************************************************************
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* Copyright (c) 2014-2024 OpenRCT2 developers
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*
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* For a complete list of all authors, please refer to contributors.md
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* Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
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*
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* OpenRCT2 is licensed under the GNU General Public License version 3.
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*****************************************************************************/
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#if defined(__amd64__) || defined(_M_AMD64) || defined(__i386__) || defined(_M_IX86)
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// Don't bother checking for CPUID, prefetch is available since Pentium 4
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# include <xmmintrin.h>
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// This cannot be expressed as `constexpr` function, exclude it from clang-tidy check
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// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
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# define PREFETCH(x) _mm_prefetch(reinterpret_cast<const char*>(x), _MM_HINT_T0)
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#elif defined(_MSC_VER) && defined(_M_ARM64)
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// ARM64 prefetch is available since ARMv8.
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// MSVC's help (https://learn.microsoft.com/en-us/cpp/intrinsics/arm64-intrinsics?view=msvc-170)
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// is incorrect and points to a different header (arm64_neon.h), which doesn't contain prefetch.
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// Correct header info taken from
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// https://github.com/microsoft/wdkmetadata/blob/1ac0dd0719f19196334de12cf2a6dec20316d440/generation/WDK/IdlHeaders/km/crt/intrin.h#L2
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// and
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// https://github.com/microsoft/wdkmetadata/blob/1ac0dd0719f19196334de12cf2a6dec20316d440/generation/WDK/IdlHeaders/km/crt/intrin.h#L411
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# include <intrin.h>
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# define PREFETCH(x) __prefetch(x)
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#elif defined(__GNUC__)
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// Let the compiler handle prefetch instruction
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# define PREFETCH(x) __builtin_prefetch(x)
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#else
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# define PREFETCH(x)
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#endif
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