2 #ifndef BT_CPU_UTILITY_H 3 #define BT_CPU_UTILITY_H 12 #endif //BT_ALLOW_SSE4 15 #if defined BT_USE_NEON 16 #define ARM_NEON_GCC_COMPATIBILITY 1 18 #include <sys/types.h> 19 #include <sys/sysctl.h> 37 static int capabilities = 0;
38 static bool testedCapabilities =
false;
39 if (0 != testedCapabilities)
47 size_t featureSize =
sizeof(hasFeature);
48 int err = sysctlbyname(
"hw.optional.neon_hpfp", &hasFeature, &featureSize, NULL, 0);
49 if (0 == err && hasFeature)
57 memset(cpuInfo, 0,
sizeof(cpuInfo));
58 unsigned long long sseExt = 0;
61 bool osUsesXSAVE_XRSTORE = cpuInfo[2] & (1 << 27) ||
false;
62 bool cpuAVXSuport = cpuInfo[2] & (1 << 28) ||
false;
64 if (osUsesXSAVE_XRSTORE && cpuAVXSuport)
68 const int OSXSAVEFlag = (1UL << 27);
69 const int AVXFlag = ((1UL << 28) | OSXSAVEFlag);
70 const int FMAFlag = ((1UL << 12) | AVXFlag | OSXSAVEFlag);
71 if ((cpuInfo[2] & FMAFlag) == FMAFlag && (sseExt & 6) == 6)
76 const int SSE41Flag = (1 << 19);
77 if (cpuInfo[2] & SSE41Flag)
84 testedCapabilities =
true;
92 #endif //BT_CPU_UTILITY_H static int getCpuFeatures()
Rudimentary btCpuFeatureUtility for CPU features: only report the features that Bullet actually uses ...