mirror of
https://github.com/yuzu-mirror/yuzu.git
synced 2024-11-19 10:37:33 +01:00
142 lines
4.1 KiB
C++
142 lines
4.1 KiB
C++
// Copyright 2013 Dolphin Emulator Project / 2015 Citra Emulator Project
|
|
// Licensed under GPLv2 or any later version
|
|
// Refer to the license.txt file included.
|
|
|
|
#include <cstring>
|
|
#include "common/common_types.h"
|
|
#include "common/x64/cpu_detect.h"
|
|
|
|
#ifdef _MSC_VER
|
|
#include <intrin.h>
|
|
#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], int function_id, int 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], int 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 {
|
|
|
|
// 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];
|
|
memset(caps.brand_string, 0, sizeof(caps.brand_string));
|
|
|
|
// Detect CPU's CPUID capabilities and grab CPU string
|
|
__cpuid(cpu_id, 0x00000000);
|
|
u32 max_std_fn = cpu_id[0]; // EAX
|
|
|
|
std::memcpy(&caps.brand_string[0], &cpu_id[1], sizeof(int));
|
|
std::memcpy(&caps.brand_string[4], &cpu_id[3], sizeof(int));
|
|
std::memcpy(&caps.brand_string[8], &cpu_id[2], sizeof(int));
|
|
|
|
__cpuid(cpu_id, 0x80000000);
|
|
|
|
u32 max_ex_fn = cpu_id[0];
|
|
|
|
// Set reasonable default brand string even if brand string not available
|
|
strcpy(caps.cpu_string, caps.brand_string);
|
|
|
|
// Detect family and other miscellaneous features
|
|
if (max_std_fn >= 1) {
|
|
__cpuid(cpu_id, 0x00000001);
|
|
|
|
if ((cpu_id[3] >> 25) & 1)
|
|
caps.sse = true;
|
|
if ((cpu_id[3] >> 26) & 1)
|
|
caps.sse2 = true;
|
|
if ((cpu_id[2]) & 1)
|
|
caps.sse3 = true;
|
|
if ((cpu_id[2] >> 9) & 1)
|
|
caps.ssse3 = true;
|
|
if ((cpu_id[2] >> 19) & 1)
|
|
caps.sse4_1 = true;
|
|
if ((cpu_id[2] >> 20) & 1)
|
|
caps.sse4_2 = true;
|
|
if ((cpu_id[2] >> 25) & 1)
|
|
caps.aes = true;
|
|
|
|
// 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 (((cpu_id[2] >> 28) & 1) && ((cpu_id[2] >> 27) & 1)) {
|
|
if ((_xgetbv(_XCR_XFEATURE_ENABLED_MASK) & 0x6) == 0x6) {
|
|
caps.avx = true;
|
|
if ((cpu_id[2] >> 12) & 1)
|
|
caps.fma = true;
|
|
}
|
|
}
|
|
|
|
if (max_std_fn >= 7) {
|
|
__cpuidex(cpu_id, 0x00000007, 0x00000000);
|
|
// Can't enable AVX2 unless the XSAVE/XGETBV checks above passed
|
|
if ((cpu_id[1] >> 5) & 1)
|
|
caps.avx2 = caps.avx;
|
|
if ((cpu_id[1] >> 3) & 1)
|
|
caps.bmi1 = true;
|
|
if ((cpu_id[1] >> 8) & 1)
|
|
caps.bmi2 = true;
|
|
}
|
|
}
|
|
|
|
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);
|
|
if ((cpu_id[2] >> 16) & 1)
|
|
caps.fma4 = true;
|
|
}
|
|
|
|
return caps;
|
|
}
|
|
|
|
const CPUCaps& GetCPUCaps() {
|
|
static CPUCaps caps = Detect();
|
|
return caps;
|
|
}
|
|
|
|
} // namespace Common
|