source: Daodan/MSYS2/mingw32/include/isl/hash.h

/*
 * Copyright 2008-2009 Katholieke Universiteit Leuven
 *
 * Use of this software is governed by the MIT license
 *
 * Written by Sven Verdoolaege, K.U.Leuven, Departement
 * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
 */

#ifndef ISL_HASH_H
#define ISL_HASH_H

#include <stdlib.h>
#include <isl/stdint.h>
#include <isl/ctx.h>

#if defined(__cplusplus)
extern "C" {
#endif

#define isl_hash_init()         (2166136261u)
#define isl_hash_byte(h,b)      do {                                    \
                                        h *= 16777619;                  \
                                        h ^= b;                         \
                                } while(0)
#define isl_hash_hash(h,h2)                                             \
        do {                                                            \
                isl_hash_byte(h, (h2) & 0xFF);                          \
                isl_hash_byte(h, ((h2) >> 8) & 0xFF);                   \
                isl_hash_byte(h, ((h2) >> 16) & 0xFF);                  \
                isl_hash_byte(h, ((h2) >> 24) & 0xFF);                  \
        } while(0)
#define isl_hash_bits(h,bits)                                           \
        ((bits) == 32) ? (h) :                                          \
        ((bits) >= 16) ?                                                \
              ((h) >> (bits)) ^ ((h) & (((uint32_t)1 << (bits)) - 1)) : \
              (((h) >> (bits)) ^ (h)) & (((uint32_t)1 << (bits)) - 1)

uint32_t isl_hash_string(uint32_t hash, const char *s);
uint32_t isl_hash_mem(uint32_t hash, const void *p, size_t len);

#define isl_hash_builtin(h,l)   isl_hash_mem(h, &l, sizeof(l))

struct isl_hash_table_entry
{
        uint32_t  hash;
        void     *data;
};

struct isl_hash_table {
        int    bits;
        int    n;
        struct isl_hash_table_entry *entries;
};

struct isl_hash_table *isl_hash_table_alloc(struct isl_ctx *ctx, int min_size);
void isl_hash_table_free(struct isl_ctx *ctx, struct isl_hash_table *table);

int isl_hash_table_init(struct isl_ctx *ctx, struct isl_hash_table *table,
                        int min_size);
void isl_hash_table_clear(struct isl_hash_table *table);
extern struct isl_hash_table_entry *isl_hash_table_entry_none;
struct isl_hash_table_entry *isl_hash_table_find(struct isl_ctx *ctx,
                            struct isl_hash_table *table,
                            uint32_t key_hash,
                            isl_bool (*eq)(const void *entry, const void *val),
                            const void *val, int reserve);
isl_stat isl_hash_table_foreach(isl_ctx *ctx, struct isl_hash_table *table,
        isl_stat (*fn)(void **entry, void *user), void *user);
void isl_hash_table_remove(struct isl_ctx *ctx,
                                struct isl_hash_table *table,
                                struct isl_hash_table_entry *entry);

#if defined(__cplusplus)
}
#endif

#endif