[core/core_timing] better MWAITX and WAITPKG delays (#3984)

This implements MWAITX and WAITPKG extensions (umonitor, mwait) for CPUs that support them.

Reduces wait times and bypasses the timing stuff from the OS that is slow (windows notably). generally it should answer within 0.2 to 0.5 microsecs (since most requests wait for that long).

Also does a general rework of static ctors and stuff

Signed-off-by: lizzie <lizzie@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3984
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: crueter <crueter@eden-emu.dev>

1 files changed, 0 insertions, 250 deletions

diff --git a/src/common/x64/cpu_detect.cpp b/src/common/x64/cpu_detect.cpp
deleted file mode 100644
index d613954eb5..0000000000
--- a/src/common/x64/cpu_detect.cpp
+++ /dev/null
@@ -1,250 +0,0 @@
-// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
-// SPDX-License-Identifier: GPL-3.0-or-later
-
-// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
-// SPDX-FileCopyrightText: Copyright 2013 Dolphin Emulator Project / 2015 Citra Emulator Project
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-#include <array>
-#include <cstring>
-#include <fstream>
-#include <iterator>
-#include <optional>
-#include <string_view>
-#include <thread>
-#include <vector>
-#include "common/bit_util.h"
-#include "common/common_types.h"
-#include "common/logging.h"
-#include "common/x64/cpu_detect.h"
-#include "common/x64/rdtsc.h"
-
-#ifdef _WIN32
-#include <windows.h>
-#endif
-
-#ifdef _MSC_VER
-#include <intrin.h>
-
-static inline u64 xgetbv(u32 index) {
-    return _xgetbv(index);
-}
-#else
-
-#if defined(__DragonFly__) || defined(__FreeBSD__)
-// clang-format off
-#include <sys/types.h>
-#include <machine/cpufunc.h>
-// clang-format on
-#endif
-
-static inline void __cpuidex(int info[4], u32 function_id, u32 subfunction_id) {
-#if defined(__DragonFly__) || defined(__FreeBSD__)
-    // Despite the name, this is just do_cpuid() with ECX as second input.
-    cpuid_count((u_int)function_id, (u_int)subfunction_id, (u_int*)info);
-#else
-    info[0] = function_id;    // eax
-    info[2] = subfunction_id; // ecx
-    __asm__("cpuid"
-            : "=a"(info[0]), "=b"(info[1]), "=c"(info[2]), "=d"(info[3])
-            : "a"(function_id), "c"(subfunction_id));
-#endif
-}
-
-static inline void __cpuid(int info[4], u32 function_id) {
-    return __cpuidex(info, function_id, 0);
-}
-
-#define _XCR_XFEATURE_ENABLED_MASK 0
-static inline u64 xgetbv(u32 index) {
-    u32 eax, edx;
-    __asm__ __volatile__("xgetbv" : "=a"(eax), "=d"(edx) : "c"(index));
-    return ((u64)edx << 32) | eax;
-}
-#endif // _MSC_VER
-
-namespace Common {
-
-CPUCaps::Manufacturer CPUCaps::ParseManufacturer(std::string_view brand_string) {
-    if (brand_string == "GenuineIntel") {
-        return Manufacturer::Intel;
-    } else if (brand_string == "AuthenticAMD") {
-        return Manufacturer::AMD;
-    } else if (brand_string == "HygonGenuine") {
-        return Manufacturer::Hygon;
-    }
-    return Manufacturer::Unknown;
-}
-
-// Detects the various CPU features
-static CPUCaps Detect() {
-    CPUCaps caps = {};
-
-    // Assumes the CPU supports the CPUID instruction. Those that don't would likely not support
-    // yuzu at all anyway
-
-    int cpu_id[4];
-
-    // Detect CPU's CPUID capabilities and grab manufacturer string
-    __cpuid(cpu_id, 0x00000000);
-    const u32 max_std_fn = cpu_id[0]; // EAX
-
-    std::memset(caps.brand_string, 0, std::size(caps.brand_string));
-    std::memcpy(&caps.brand_string[0], &cpu_id[1], sizeof(u32));
-    std::memcpy(&caps.brand_string[4], &cpu_id[3], sizeof(u32));
-    std::memcpy(&caps.brand_string[8], &cpu_id[2], sizeof(u32));
-
-    caps.manufacturer = CPUCaps::ParseManufacturer(caps.brand_string);
-
-    // Set reasonable default cpu string even if brand string not available
-    std::strncpy(caps.cpu_string, caps.brand_string, std::size(caps.brand_string));
-
-    __cpuid(cpu_id, 0x80000000);
-
-    const u32 max_ex_fn = cpu_id[0];
-
-    // Detect family and other miscellaneous features
-    if (max_std_fn >= 1) {
-        __cpuid(cpu_id, 0x00000001);
-        caps.sse3 = Common::Bit<0>(cpu_id[2]);
-        caps.pclmulqdq = Common::Bit<1>(cpu_id[2]);
-        caps.ssse3 = Common::Bit<9>(cpu_id[2]);
-        caps.sse4_1 = Common::Bit<19>(cpu_id[2]);
-        caps.sse4_2 = Common::Bit<20>(cpu_id[2]);
-        caps.movbe = Common::Bit<22>(cpu_id[2]);
-        caps.popcnt = Common::Bit<23>(cpu_id[2]);
-        caps.aes = Common::Bit<25>(cpu_id[2]);
-        caps.f16c = Common::Bit<29>(cpu_id[2]);
-
-        // AVX support requires 3 separate checks:
-        //  - Is the AVX bit set in CPUID?
-        //  - Is the XSAVE bit set in CPUID?
-        //  - XGETBV result has the XCR bit set.
-        if (Common::Bit<28>(cpu_id[2]) && Common::Bit<27>(cpu_id[2])) {
-            if ((xgetbv(_XCR_XFEATURE_ENABLED_MASK) & 0x6) == 0x6) {
-                caps.avx = true;
-                if (Common::Bit<12>(cpu_id[2]))
-                    caps.fma = true;
-            }
-        }
-
-        if (max_std_fn >= 7) {
-            __cpuidex(cpu_id, 0x00000007, 0x00000000);
-            // Can't enable AVX{2,512} unless the XSAVE/XGETBV checks above passed
-            if (caps.avx) {
-                caps.avx2 = Common::Bit<5>(cpu_id[1]);
-                caps.avx512f = Common::Bit<16>(cpu_id[1]);
-                caps.avx512dq = Common::Bit<17>(cpu_id[1]);
-                caps.avx512cd = Common::Bit<28>(cpu_id[1]);
-                caps.avx512bw = Common::Bit<30>(cpu_id[1]);
-                caps.avx512vl = Common::Bit<31>(cpu_id[1]);
-                caps.avx512vbmi = Common::Bit<1>(cpu_id[2]);
-                caps.avx512bitalg = Common::Bit<12>(cpu_id[2]);
-            }
-
-            caps.bmi1 = Common::Bit<3>(cpu_id[1]);
-            caps.bmi2 = Common::Bit<8>(cpu_id[1]);
-            caps.sha = Common::Bit<29>(cpu_id[1]);
-
-            caps.waitpkg = Common::Bit<5>(cpu_id[2]);
-            caps.gfni = Common::Bit<8>(cpu_id[2]);
-        }
-    }
-
-    if (max_ex_fn >= 0x80000004) {
-        // Extract CPU model string
-        __cpuid(cpu_id, 0x80000002);
-        std::memcpy(caps.cpu_string, cpu_id, sizeof(cpu_id));
-        __cpuid(cpu_id, 0x80000003);
-        std::memcpy(caps.cpu_string + 16, cpu_id, sizeof(cpu_id));
-        __cpuid(cpu_id, 0x80000004);
-        std::memcpy(caps.cpu_string + 32, cpu_id, sizeof(cpu_id));
-    }
-
-    if (max_ex_fn >= 0x80000001) {
-        // Check for more features
-        __cpuid(cpu_id, 0x80000001);
-        caps.lzcnt = Common::Bit<5>(cpu_id[2]);
-        caps.monitorx = Common::Bit<29>(cpu_id[2]);
-    }
-
-    if (max_ex_fn >= 0x80000007) {
-        __cpuid(cpu_id, 0x80000007);
-        caps.invariant_tsc = Common::Bit<8>(cpu_id[3]);
-    }
-
-    if (max_std_fn >= 0x15) {
-        __cpuid(cpu_id, 0x15);
-        caps.tsc_crystal_ratio_denominator = cpu_id[0];
-        caps.tsc_crystal_ratio_numerator = cpu_id[1];
-        caps.crystal_frequency = cpu_id[2];
-        // Some CPU models might not return a crystal frequency.
-        // The CPU model can be detected to use the values from turbostat
-        // https://github.com/torvalds/linux/blob/master/tools/power/x86/turbostat/turbostat.c#L5569
-        // but it's easier to just estimate the TSC tick rate for these cases.
-        if (caps.tsc_crystal_ratio_denominator) {
-            caps.tsc_frequency = static_cast<u64>(caps.crystal_frequency) *
-                                 caps.tsc_crystal_ratio_numerator /
-                                 caps.tsc_crystal_ratio_denominator;
-        } else {
-            caps.tsc_frequency = X64::EstimateRDTSCFrequency();
-        }
-    }
-
-    if (max_std_fn >= 0x16) {
-        __cpuid(cpu_id, 0x16);
-        caps.base_frequency = cpu_id[0];
-        caps.max_frequency = cpu_id[1];
-        caps.bus_frequency = cpu_id[2];
-    }
-
-    return caps;
-}
-
-const CPUCaps& GetCPUCaps() {
-    static CPUCaps caps = Detect();
-    return caps;
-}
-
-std::optional<int> GetProcessorCount() {
-#if defined(_WIN32)
-    // Get the buffer length.
-    DWORD length = 0;
-    GetLogicalProcessorInformation(nullptr, &length);
-    if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
-        LOG_ERROR(Frontend, "Failed to query core count.");
-        return std::nullopt;
-    }
-    std::vector<SYSTEM_LOGICAL_PROCESSOR_INFORMATION> buffer(
-        length / sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION));
-    // Now query the core count.
-    if (!GetLogicalProcessorInformation(buffer.data(), &length)) {
-        LOG_ERROR(Frontend, "Failed to query core count.");
-        return std::nullopt;
-    }
-    return static_cast<int>(
-        std::count_if(buffer.cbegin(), buffer.cend(), [](const auto& proc_info) {
-            return proc_info.Relationship == RelationProcessorCore;
-        }));
-#elif defined(__unix__)
-    const int thread_count = std::thread::hardware_concurrency();
-    std::ifstream smt("/sys/devices/system/cpu/smt/active");
-    char state = '0';
-    if (smt) {
-        smt.read(&state, sizeof(state));
-    }
-    switch (state) {
-    case '0':
-        return thread_count;
-    case '1':
-        return thread_count / 2;
-    default:
-        return std::nullopt;
-    }
-#else
-    // Shame on you
-    return std::nullopt;
-#endif
-}
-
-} // namespace Common