146 lines
4.4 KiB
C++
146 lines
4.4 KiB
C++
// Copyright 2013 Dolphin Emulator Project / 2015 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <cstring>
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#include "common/common_types.h"
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#include "common/x64/cpu_detect.h"
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#ifdef _MSC_VER
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#include <intrin.h>
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#else
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#if defined(__DragonFly__) || defined(__FreeBSD__)
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// clang-format off
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#include <sys/types.h>
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#include <machine/cpufunc.h>
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// clang-format on
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#endif
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static inline void __cpuidex(int info[4], int function_id, int subfunction_id) {
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#if defined(__DragonFly__) || defined(__FreeBSD__)
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// Despite the name, this is just do_cpuid() with ECX as second input.
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cpuid_count((u_int)function_id, (u_int)subfunction_id, (u_int*)info);
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#else
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info[0] = function_id; // eax
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info[2] = subfunction_id; // ecx
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__asm__("cpuid"
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: "=a"(info[0]), "=b"(info[1]), "=c"(info[2]), "=d"(info[3])
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: "a"(function_id), "c"(subfunction_id));
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#endif
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}
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static inline void __cpuid(int info[4], int function_id) {
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return __cpuidex(info, function_id, 0);
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}
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#define _XCR_XFEATURE_ENABLED_MASK 0
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static inline u64 _xgetbv(u32 index) {
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u32 eax, edx;
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__asm__ __volatile__("xgetbv" : "=a"(eax), "=d"(edx) : "c"(index));
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return ((u64)edx << 32) | eax;
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}
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#endif // _MSC_VER
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namespace Common {
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// Detects the various CPU features
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static CPUCaps Detect() {
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CPUCaps caps = {};
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// Assumes the CPU supports the CPUID instruction. Those that don't would likely not support
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// Citra at all anyway
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int cpu_id[4];
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memset(caps.brand_string, 0, sizeof(caps.brand_string));
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// Detect CPU's CPUID capabilities and grab CPU string
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__cpuid(cpu_id, 0x00000000);
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u32 max_std_fn = cpu_id[0]; // EAX
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std::memcpy(&caps.brand_string[0], &cpu_id[1], sizeof(int));
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std::memcpy(&caps.brand_string[4], &cpu_id[3], sizeof(int));
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std::memcpy(&caps.brand_string[8], &cpu_id[2], sizeof(int));
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__cpuid(cpu_id, 0x80000000);
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u32 max_ex_fn = cpu_id[0];
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// Set reasonable default brand string even if brand string not available
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strcpy(caps.cpu_string, caps.brand_string);
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// Detect family and other miscellaneous features
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if (max_std_fn >= 1) {
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__cpuid(cpu_id, 0x00000001);
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if ((cpu_id[3] >> 25) & 1)
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caps.sse = true;
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if ((cpu_id[3] >> 26) & 1)
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caps.sse2 = true;
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if ((cpu_id[2]) & 1)
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caps.sse3 = true;
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if ((cpu_id[2] >> 9) & 1)
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caps.ssse3 = true;
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if ((cpu_id[2] >> 19) & 1)
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caps.sse4_1 = true;
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if ((cpu_id[2] >> 20) & 1)
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caps.sse4_2 = true;
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if ((cpu_id[2] >> 25) & 1)
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caps.aes = true;
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// AVX support requires 3 separate checks:
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// - Is the AVX bit set in CPUID?
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// - Is the XSAVE bit set in CPUID?
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// - XGETBV result has the XCR bit set.
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if (((cpu_id[2] >> 28) & 1) && ((cpu_id[2] >> 27) & 1)) {
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if ((_xgetbv(_XCR_XFEATURE_ENABLED_MASK) & 0x6) == 0x6) {
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caps.avx = true;
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if ((cpu_id[2] >> 12) & 1)
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caps.fma = true;
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}
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}
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if (max_std_fn >= 7) {
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__cpuidex(cpu_id, 0x00000007, 0x00000000);
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// Can't enable AVX2 unless the XSAVE/XGETBV checks above passed
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if ((cpu_id[1] >> 5) & 1)
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caps.avx2 = caps.avx;
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if ((cpu_id[1] >> 3) & 1)
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caps.bmi1 = true;
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if ((cpu_id[1] >> 8) & 1)
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caps.bmi2 = true;
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// Checks for AVX512F, AVX512CD, AVX512VL, AVX512DQ, AVX512BW (Intel Skylake-X/SP)
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if ((cpu_id[1] >> 16) & 1 && (cpu_id[1] >> 28) & 1 && (cpu_id[1] >> 31) & 1 &&
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(cpu_id[1] >> 17) & 1 && (cpu_id[1] >> 30) & 1) {
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caps.avx512 = caps.avx2;
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}
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}
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}
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if (max_ex_fn >= 0x80000004) {
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// Extract CPU model string
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__cpuid(cpu_id, 0x80000002);
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std::memcpy(caps.cpu_string, cpu_id, sizeof(cpu_id));
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__cpuid(cpu_id, 0x80000003);
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std::memcpy(caps.cpu_string + 16, cpu_id, sizeof(cpu_id));
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__cpuid(cpu_id, 0x80000004);
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std::memcpy(caps.cpu_string + 32, cpu_id, sizeof(cpu_id));
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}
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if (max_ex_fn >= 0x80000001) {
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// Check for more features
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__cpuid(cpu_id, 0x80000001);
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if ((cpu_id[2] >> 16) & 1)
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caps.fma4 = true;
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}
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return caps;
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}
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const CPUCaps& GetCPUCaps() {
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static CPUCaps caps = Detect();
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return caps;
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}
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} // namespace Common
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