Function cpuid

src/crypto/sha256.cpp:553–560

We can't use cpuid.h's __get_cpuid as it does not support subleafs.

#if defined(USE_ASM) && (defined(__x86_64__) || defined(__amd64__) || defined(__i386__))
// We can't use cpuid.h's __get_cpuid as it does not support subleafs.
void inline cpuid(uint32_t leaf, uint32_t subleaf, uint32_t& a, uint32_t& b, uint32_t& c, uint32_t& d)
{
#ifdef __GNUC__
    __cpuid_count(leaf, subleaf, a, b, c, d);
#else
  __asm__ ("cpuid" : "=a"(a), "=b"(b), "=c"(c), "=d"(d) : "0"(leaf), "2"(subleaf));
#endif
}

/** Check whether the OS has enabled AVX registers. */
bool AVXEnabled()