mirror of
https://github.com/Relintai/pandemonium_engine.git
synced 2024-12-28 14:47:13 +01:00
89 lines
2.1 KiB
C++
89 lines
2.1 KiB
C++
|
|
#ifndef BT_CPU_UTILITY_H
|
|
#define BT_CPU_UTILITY_H
|
|
|
|
#include "LinearMath/btScalar.h"
|
|
|
|
#include <string.h> //memset
|
|
#ifdef USE_SIMD
|
|
#include <emmintrin.h>
|
|
#ifdef BT_ALLOW_SSE4
|
|
#include <intrin.h>
|
|
#endif //BT_ALLOW_SSE4
|
|
#endif //USE_SIMD
|
|
|
|
#if defined BT_USE_NEON
|
|
#define ARM_NEON_GCC_COMPATIBILITY 1
|
|
#include <arm_neon.h>
|
|
#include <sys/types.h>
|
|
#include <sys/sysctl.h> //for sysctlbyname
|
|
#endif //BT_USE_NEON
|
|
|
|
///Rudimentary btCpuFeatureUtility for CPU features: only report the features that Bullet actually uses (SSE4/FMA3, NEON_HPFP)
|
|
///We assume SSE2 in case BT_USE_SSE2 is defined in LinearMath/btScalar.h
|
|
class btCpuFeatureUtility
|
|
{
|
|
public:
|
|
enum btCpuFeature
|
|
{
|
|
CPU_FEATURE_FMA3 = 1,
|
|
CPU_FEATURE_SSE4_1 = 2,
|
|
CPU_FEATURE_NEON_HPFP = 4
|
|
};
|
|
|
|
static int getCpuFeatures()
|
|
{
|
|
static int capabilities = 0;
|
|
static bool testedCapabilities = false;
|
|
if (0 != testedCapabilities)
|
|
{
|
|
return capabilities;
|
|
}
|
|
|
|
#ifdef BT_USE_NEON
|
|
{
|
|
uint32_t hasFeature = 0;
|
|
size_t featureSize = sizeof(hasFeature);
|
|
int err = sysctlbyname("hw.optional.neon_hpfp", &hasFeature, &featureSize, NULL, 0);
|
|
if (0 == err && hasFeature)
|
|
capabilities |= CPU_FEATURE_NEON_HPFP;
|
|
}
|
|
#endif //BT_USE_NEON
|
|
|
|
#ifdef BT_ALLOW_SSE4
|
|
{
|
|
int cpuInfo[4];
|
|
memset(cpuInfo, 0, sizeof(cpuInfo));
|
|
unsigned long long sseExt = 0;
|
|
__cpuid(cpuInfo, 1);
|
|
|
|
bool osUsesXSAVE_XRSTORE = cpuInfo[2] & (1 << 27) || false;
|
|
bool cpuAVXSuport = cpuInfo[2] & (1 << 28) || false;
|
|
|
|
if (osUsesXSAVE_XRSTORE && cpuAVXSuport)
|
|
{
|
|
sseExt = _xgetbv(0);
|
|
}
|
|
const int OSXSAVEFlag = (1UL << 27);
|
|
const int AVXFlag = ((1UL << 28) | OSXSAVEFlag);
|
|
const int FMAFlag = ((1UL << 12) | AVXFlag | OSXSAVEFlag);
|
|
if ((cpuInfo[2] & FMAFlag) == FMAFlag && (sseExt & 6) == 6)
|
|
{
|
|
capabilities |= btCpuFeatureUtility::CPU_FEATURE_FMA3;
|
|
}
|
|
|
|
const int SSE41Flag = (1 << 19);
|
|
if (cpuInfo[2] & SSE41Flag)
|
|
{
|
|
capabilities |= btCpuFeatureUtility::CPU_FEATURE_SSE4_1;
|
|
}
|
|
}
|
|
#endif //BT_ALLOW_SSE4
|
|
|
|
testedCapabilities = true;
|
|
return capabilities;
|
|
}
|
|
};
|
|
|
|
#endif //BT_CPU_UTILITY_H
|