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 *    may be used to endorse or promote products derived from this software
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/** \file
 * \brief Platform specific popcount functions
 */

#ifndef POPCOUNT_ARCH_X86_H
#define POPCOUNT_ARCH_X86_H

#include "ue2common.h"
#include "util/arch.h"
#include "util/intrinsics.h"

#include "util/arch/common/popcount.h"

static really_inline
u32 popcount32_impl(u32 x) {
#if defined(HAVE_POPCOUNT_INSTR)
    // Single-instruction builtin.
    return _mm_popcnt_u32(x);
#else
    return popcount32_impl_c(x);
#endif
}

static really_inline
u32 popcount64_impl(u64a x) {
#if defined(ARCH_X86_64)
# if defined(HAVE_POPCOUNT_INSTR)
    // Single-instruction builtin.
    return (u32)_mm_popcnt_u64(x);
# else
    return popcount64_impl_c(x);
# endif
#else
    // Synthesise from two 32-bit cases.
    return popcount32_impl(x >> 32) + popcount32_impl(x);
#endif
}

#endif // POPCOUNT_ARCH_X86_h