root/src/runtime/powerpc_cpu_features.cpp

DEFINITIONS

1. halide_get_cpu_features

#include "HalideRuntime.h"

#define AT_HWCAP    16
#define AT_HWCAP2   26

#define PPC_FEATURE_HAS_VSX     0x00000080

#define PPC_FEATURE2_ARCH_2_07     0x80000000

extern "C" unsigned long int getauxval(unsigned long int);

namespace Halide { namespace Runtime { namespace Internal {

WEAK CpuFeatures halide_get_cpu_features() {
    const unsigned long hwcap = getauxval(AT_HWCAP);
    const unsigned long hwcap2 = getauxval(AT_HWCAP2);

    const uint64_t known = (1ULL << halide_target_feature_vsx) |
                           (1ULL << halide_target_feature_power_arch_2_07);
    uint64_t available = 0;
    if (hwcap & PPC_FEATURE_HAS_VSX) {
        available |= (1ULL << halide_target_feature_vsx);
    }
    if (hwcap2 & PPC_FEATURE2_ARCH_2_07) {
        available |= (1ULL << halide_target_feature_power_arch_2_07);
    }
    CpuFeatures features = {known, available};
    return features;
}

}}} // namespace Halide::Runtime::Internal