#ifndef _ATOMIC_H
#define _ATOMIC_H

#include <stdint.h>

#include "atomic_arch.h"

#ifndef a_crash
#define a_crash a_crash
static inline void a_crash()
{
        *(volatile char *)0=0;
}
#endif

#ifndef a_ctz_32
#define a_ctz_32 a_ctz_32
static inline int a_ctz_32(uint32_t x)
{
#ifdef a_clz_32
        return 31-a_clz_32(x&-x);
#else
        static const char debruijn32[32] = {
                0, 1, 23, 2, 29, 24, 19, 3, 30, 27, 25, 11, 20, 8, 4, 13,
                31, 22, 28, 18, 26, 10, 7, 12, 21, 17, 9, 6, 16, 5, 15, 14
        };
        return debruijn32[(x&-x)*0x076be629 >> 27];
#endif
}
#endif

#ifndef a_ctz_64
#define a_ctz_64 a_ctz_64
static inline int a_ctz_64(uint64_t x)
{
        static const char debruijn64[64] = {
                0, 1, 2, 53, 3, 7, 54, 27, 4, 38, 41, 8, 34, 55, 48, 28,
                62, 5, 39, 46, 44, 42, 22, 9, 24, 35, 59, 56, 49, 18, 29, 11,
                63, 52, 6, 26, 37, 40, 33, 47, 61, 45, 43, 21, 23, 58, 17, 10,
                51, 25, 36, 32, 60, 20, 57, 16, 50, 31, 19, 15, 30, 14, 13, 12
        };
        if (sizeof(long) < 8) {
                uint32_t y = x;
                if (!y) {
                        y = x>>32;
                        return 32 + a_ctz_32(y);
                }
                return a_ctz_32(y);
        }
        return debruijn64[(x&-x)*0x022fdd63cc95386dull >> 58];
}
#endif

static inline int a_ctz_l(unsigned long x)
{
        return (sizeof(long) < 8) ? a_ctz_32(x) : a_ctz_64(x);
}

#ifndef a_clz_64
#define a_clz_64 a_clz_64
static inline int a_clz_64(uint64_t x)
{
#ifdef a_clz_32
        if (x>>32)
                return a_clz_32(x>>32);
        return a_clz_32(x) + 32;
#else
        uint32_t y;
        int r;
        if (x>>32) y=x>>32, r=0; else y=x, r=32;
        if (y>>16) y>>=16; else r |= 16;
        if (y>>8) y>>=8; else r |= 8;
        if (y>>4) y>>=4; else r |= 4;
        if (y>>2) y>>=2; else r |= 2;
        return r | !(y>>1);
#endif
}
#endif

#ifndef a_clz_32
#define a_clz_32 a_clz_32
static inline int a_clz_32(uint32_t x)
{
        x >>= 1;
        x |= x >> 1;
        x |= x >> 2;
        x |= x >> 4;
        x |= x >> 8;
        x |= x >> 16;
        x++;
        return 31-a_ctz_32(x);
}
#endif

#endif