rte_efd_arm64.h

/*
 *   BSD LICENSE
 *
 *   Copyright (C) Cavium, Inc. 2017.
 *
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 *       from this software without specific prior written permission.
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 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 */

/*
 * 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__ */