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#pragma once
#include <util/generic/typelist.h>
#include <util/system/cpu_id.h>
#include <util/system/defaults.h>
#include <util/system/hi_lo.h>
#include <util/system/platform.h>
#if defined(_MSC_VER)
#include <intrin.h>
#endif
static inline ui32 PopCountImpl(ui8 n) {
#if defined(_ppc64_)
ui32 r;
__asm__("popcntb %0, %1"
: "=r"(r)
: "r"(n)
:);
return r;
#else
extern ui8 const* PopCountLUT8;
return PopCountLUT8[n];
#endif
}
static inline ui32 PopCountImpl(ui16 n) {
#if defined(_MSC_VER)
return __popcnt16(n);
#else
extern ui8 const* PopCountLUT16;
return PopCountLUT16[n];
#endif
}
static inline ui32 PopCountImpl(ui32 n) {
#if defined(_MSC_VER)
return __popcnt(n);
#else
#if defined(_x86_64_)
if (NX86::CachedHavePOPCNT()) {
ui32 r;
__asm__("popcnt %1, %0;"
: "=r"(r)
: "r"(n)
:);
return r;
}
#else
#if defined(_ppc64_)
ui32 r;
__asm__("popcntw %0, %1"
: "=r"(r)
: "r"(n)
:);
return r;
#endif
#endif
return PopCountImpl((ui16)Lo16(n)) + PopCountImpl((ui16)Hi16(n));
#endif
}
static inline ui32 PopCountImpl(ui64 n) {
#if defined(_MSC_VER) && !defined(_i386_)
return __popcnt64(n);
#else
#if defined(_x86_64_)
if (NX86::CachedHavePOPCNT()) {
ui64 r;
__asm__("popcnt %1, %0;"
: "=r"(r)
: "r"(n)
:);
return r;
}
#else
#if defined(_ppc64_)
ui32 r;
__asm__("popcntd %0, %1"
: "=r"(r)
: "r"(n)
:);
return r;
#endif
#endif
return PopCountImpl((ui32)Lo32(n)) + PopCountImpl((ui32)Hi32(n));
#endif
}
template <class T>
static inline ui32 PopCount(T n) {
using TCvt = TFixedWidthUnsignedInt<T>;
return PopCountImpl((TCvt)n);
}
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