rte_cmp_arm64.h

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2015 Cavium, Inc
 */

/* Functions to compare multiple of 16 byte keys (up to 128 bytes) */
static int
rte_hash_k16_cmp_eq(const void *key1, const void *key2,
                    size_t key_len __rte_unused)
{
        uint64_t x0, x1, y0, y1;

        asm volatile(
                "ldp %x[x1], %x[x0], [%x[p1]]"
                : [x1]"=r"(x1), [x0]"=r"(x0)
                : [p1]"r"(key1)
                );
        asm volatile(
                "ldp %x[y1], %x[y0], [%x[p2]]"
                : [y1]"=r"(y1), [y0]"=r"(y0)
                : [p2]"r"(key2)
                );
        x0 ^= y0;
        x1 ^= y1;
        return !(x0 == 0 && x1 == 0);
}

static int
rte_hash_k32_cmp_eq(const void *key1, const void *key2, size_t key_len)
{
        return rte_hash_k16_cmp_eq(key1, key2, key_len) ||
                rte_hash_k16_cmp_eq((const char *) key1 + 16,
                                (const char *) key2 + 16, key_len);
}

static int
rte_hash_k48_cmp_eq(const void *key1, const void *key2, size_t key_len)
{
        return rte_hash_k16_cmp_eq(key1, key2, key_len) ||
                rte_hash_k16_cmp_eq((const char *) key1 + 16,
                                (const char *) key2 + 16, key_len) ||
                rte_hash_k16_cmp_eq((const char *) key1 + 32,
                                (const char *) key2 + 32, key_len);
}

static int
rte_hash_k64_cmp_eq(const void *key1, const void *key2, size_t key_len)
{
        return rte_hash_k32_cmp_eq(key1, key2, key_len) ||
                rte_hash_k32_cmp_eq((const char *) key1 + 32,
                                (const char *) key2 + 32, key_len);
}

static int
rte_hash_k80_cmp_eq(const void *key1, const void *key2, size_t key_len)
{
        return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
                rte_hash_k16_cmp_eq((const char *) key1 + 64,
                                (const char *) key2 + 64, key_len);
}

static int
rte_hash_k96_cmp_eq(const void *key1, const void *key2, size_t key_len)
{
        return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
                rte_hash_k32_cmp_eq((const char *) key1 + 64,
                                (const char *) key2 + 64, key_len);
}

static int
rte_hash_k112_cmp_eq(const void *key1, const void *key2, size_t key_len)
{
        return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
                rte_hash_k32_cmp_eq((const char *) key1 + 64,
                                (const char *) key2 + 64, key_len) ||
                rte_hash_k16_cmp_eq((const char *) key1 + 96,
                                (const char *) key2 + 96, key_len);
}

static int
rte_hash_k128_cmp_eq(const void *key1, const void *key2, size_t key_len)
{
        return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
                rte_hash_k64_cmp_eq((const char *) key1 + 64,
                                (const char *) key2 + 64, key_len);
}