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 RTE_MACHINE_CPUFLAG_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

}