rte_efd_x86.h

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2016-2017 Intel Corporation
 */
 
/* rte_efd_x86.h
 * This file holds all x86 specific EFD functions
 */
#include <immintrin.h>
 
#if (RTE_EFD_VALUE_NUM_BITS == 8 || RTE_EFD_VALUE_NUM_BITS == 16 || \
    RTE_EFD_VALUE_NUM_BITS == 24 || RTE_EFD_VALUE_NUM_BITS == 32)
#define EFD_LOAD_SI128(val) _mm_load_si128(val)
#else
#define EFD_LOAD_SI128(val) _mm_lddqu_si128(val)
#endif
 
static inline efd_value_t
efd_lookup_internal_avx2(const efd_hashfunc_t *group_hash_idx,
        const efd_lookuptbl_t *group_lookup_table,
        const uint32_t hash_val_a, const uint32_t hash_val_b)
{
#ifdef __AVX2__
    efd_value_t value = 0;
    uint32_t i = 0;
    __m256i vhash_val_a = _mm256_set1_epi32(hash_val_a);
    __m256i vhash_val_b = _mm256_set1_epi32(hash_val_b);
 
    for (; i < RTE_EFD_VALUE_NUM_BITS; i += 8) {
        __m256i vhash_idx =
                _mm256_cvtepu16_epi32(EFD_LOAD_SI128(
                (__m128i const *) &group_hash_idx[i]));
        __m256i vlookup_table = _mm256_cvtepu16_epi32(
                EFD_LOAD_SI128((__m128i const *)
                &group_lookup_table[i]));
        __m256i vhash = _mm256_add_epi32(vhash_val_a,
                _mm256_mullo_epi32(vhash_idx, vhash_val_b));
        __m256i vbucket_idx = _mm256_srli_epi32(vhash,
                EFD_LOOKUPTBL_SHIFT);
        __m256i vresult = _mm256_srlv_epi32(vlookup_table,
                vbucket_idx);
 
        value |= (_mm256_movemask_ps(
            (__m256) _mm256_slli_epi32(vresult, 31))
            & ((1 << (RTE_EFD_VALUE_NUM_BITS - i)) - 1)) << i;
    }
 
    return value;
#else
    RTE_SET_USED(group_hash_idx);
    RTE_SET_USED(group_lookup_table);
    RTE_SET_USED(hash_val_a);
    RTE_SET_USED(hash_val_b);
    /* Return dummy value, only to avoid compilation breakage */
    return 0;
#endif
 
}