rte_crc_x86.h

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation
 */

#ifndef _RTE_CRC_X86_H_
#define _RTE_CRC_X86_H_

static inline uint32_t
crc32c_sse42_u8(uint8_t data, uint32_t init_val)
{
    __asm__ volatile(
            "crc32b %[data], %[init_val];"
            : [init_val] "+r" (init_val)
            : [data] "rm" (data));
    return init_val;
}

static inline uint32_t
crc32c_sse42_u16(uint16_t data, uint32_t init_val)
{
    __asm__ volatile(
            "crc32w %[data], %[init_val];"
            : [init_val] "+r" (init_val)
            : [data] "rm" (data));
    return init_val;
}

static inline uint32_t
crc32c_sse42_u32(uint32_t data, uint32_t init_val)
{
    __asm__ volatile(
            "crc32l %[data], %[init_val];"
            : [init_val] "+r" (init_val)
            : [data] "rm" (data));
    return init_val;
}

static inline uint32_t
crc32c_sse42_u64_mimic(uint64_t data, uint64_t init_val)
{
    union {
        uint32_t u32[2];
        uint64_t u64;
    } d;

    d.u64 = data;
    init_val = crc32c_sse42_u32(d.u32[0], (uint32_t)init_val);
    init_val = crc32c_sse42_u32(d.u32[1], (uint32_t)init_val);
    return (uint32_t)init_val;
}

static inline uint32_t
crc32c_sse42_u64(uint64_t data, uint64_t init_val)
{
    __asm__ volatile(
            "crc32q %[data], %[init_val];"
            : [init_val] "+r" (init_val)
            : [data] "rm" (data));
    return (uint32_t)init_val;
}

/*
 * Use single crc32 instruction to perform a hash on a byte value.
 * Fall back to software crc32 implementation in case SSE4.2 is
 * not supported.
 */
static inline uint32_t
rte_hash_crc_1byte(uint8_t data, uint32_t init_val)
{
    if (likely(crc32_alg & CRC32_SSE42))
        return crc32c_sse42_u8(data, init_val);

    return crc32c_1byte(data, init_val);
}

/*
 * Use single crc32 instruction to perform a hash on a 2 bytes value.
 * Fall back to software crc32 implementation in case SSE4.2 is
 * not supported.
 */
static inline uint32_t
rte_hash_crc_2byte(uint16_t data, uint32_t init_val)
{
    if (likely(crc32_alg & CRC32_SSE42))
        return crc32c_sse42_u16(data, init_val);

    return crc32c_2bytes(data, init_val);
}

/*
 * Use single crc32 instruction to perform a hash on a 4 byte value.
 * Fall back to software crc32 implementation in case SSE4.2 is
 * not supported.
 */
static inline uint32_t
rte_hash_crc_4byte(uint32_t data, uint32_t init_val)
{
    if (likely(crc32_alg & CRC32_SSE42))
        return crc32c_sse42_u32(data, init_val);

    return crc32c_1word(data, init_val);
}

/*
 * Use single crc32 instruction to perform a hash on a 8 byte value.
 * Fall back to software crc32 implementation in case SSE4.2 is
 * not supported.
 */
static inline uint32_t
rte_hash_crc_8byte(uint64_t data, uint32_t init_val)
{
#ifdef RTE_ARCH_X86_64
    if (likely(crc32_alg == CRC32_SSE42_x64))
        return crc32c_sse42_u64(data, init_val);
#endif

    if (likely(crc32_alg & CRC32_SSE42))
        return crc32c_sse42_u64_mimic(data, init_val);

    return crc32c_2words(data, init_val);
}

#endif /* _RTE_CRC_X86_H_ */