f-stack/dpdk/lib/librte_hash/rte_cmp_arm64.h

/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2015 Cavium networks. All rights reserved.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Cavium networks nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/* 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);
}