rte_efd_arm64.h

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2017 Cavium, Inc
 */

/*
 * rte_efd_arm64.h
 * This file holds all arm64 specific EFD functions
 */

#ifndef __RTE_EFD_ARM64_H__
#define __RTE_EFD_ARM64_H__

#include <rte_vect.h>

static inline efd_value_t
efd_lookup_internal_neon(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)
{
    efd_value_t value = 0;
    uint32_t i = 0;
    uint32x4_t vhash_val_a = vmovq_n_u32(hash_val_a);
    uint32x4_t vhash_val_b = vmovq_n_u32(hash_val_b);
    int32x4_t vshift = {0, 1, 2, 3};
    uint32x4_t vmask = vdupq_n_u32(0x1);
    int32x4_t vincr = vdupq_n_s32(4);

    for (; i < RTE_EFD_VALUE_NUM_BITS; i += 4) {
        uint32x4_t vhash_idx = vshll_n_u16(
            vld1_u16((uint16_t const *)&group_hash_idx[i]), 0);
        uint32x4_t vlookup_table = vshll_n_u16(
            vld1_u16((uint16_t const *)&group_lookup_table[i]), 0);
        uint32x4_t vhash = vaddq_u32(vhash_val_a,
                    vmulq_u32(vhash_idx, vhash_val_b));
        int32x4_t vbucket_idx = vnegq_s32(vreinterpretq_s32_u32(
                vshrq_n_u32(vhash, EFD_LOOKUPTBL_SHIFT)));
        uint32x4_t vresult = vshlq_u32(vlookup_table, vbucket_idx);

        vresult = vandq_u32(vresult, vmask);
        vresult = vshlq_u32(vresult, vshift);
        value |= vaddvq_u32(vresult);
        vshift = vaddq_s32(vshift, vincr);
    }

    return value;
}

#endif /* __RTE_EFD_ARM64_H__ */