lib/efd/rte_efd_x86.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2016-2017 Intel Corporation
   3  */
   4
   5 /* rte_efd_x86.h
   6  * This file holds all x86 specific EFD functions
   7  */
   8 #include <immintrin.h>
   9
  10 #if (RTE_EFD_VALUE_NUM_BITS == 8 || RTE_EFD_VALUE_NUM_BITS == 16 || \
  11         RTE_EFD_VALUE_NUM_BITS == 24 || RTE_EFD_VALUE_NUM_BITS == 32)
  12 #define EFD_LOAD_SI128(val) _mm_load_si128(val)
  13 #else
  14 #define EFD_LOAD_SI128(val) _mm_lddqu_si128(val)
  15 #endif
  16
  17 static inline efd_value_t
  18 efd_lookup_internal_avx2(const efd_hashfunc_t *group_hash_idx,
  19                 const efd_lookuptbl_t *group_lookup_table,
  20                 const uint32_t hash_val_a, const uint32_t hash_val_b)
  21 {
  22 #ifdef __AVX2__
  23         efd_value_t value = 0;
  24         uint32_t i = 0;
  25         __m256i vhash_val_a = _mm256_set1_epi32(hash_val_a);
  26         __m256i vhash_val_b = _mm256_set1_epi32(hash_val_b);
  27
  28         for (; i < RTE_EFD_VALUE_NUM_BITS; i += 8) {
  29                 __m256i vhash_idx =
  30                                 _mm256_cvtepu16_epi32(EFD_LOAD_SI128(
  31                                 (__m128i const *) &group_hash_idx[i]));
  32                 __m256i vlookup_table = _mm256_cvtepu16_epi32(
  33                                 EFD_LOAD_SI128((__m128i const *)
  34                                 &group_lookup_table[i]));
  35                 __m256i vhash = _mm256_add_epi32(vhash_val_a,
  36                                 _mm256_mullo_epi32(vhash_idx, vhash_val_b));
  37                 __m256i vbucket_idx = _mm256_srli_epi32(vhash,
  38                                 EFD_LOOKUPTBL_SHIFT);
  39                 __m256i vresult = _mm256_srlv_epi32(vlookup_table,
  40                                 vbucket_idx);
  41
  42                 value |= (_mm256_movemask_ps(
  43                         (__m256) _mm256_slli_epi32(vresult, 31))
  44                         & ((1 << (RTE_EFD_VALUE_NUM_BITS - i)) - 1)) << i;
  45         }
  46
  47         return value;
  48 #else
  49         RTE_SET_USED(group_hash_idx);
  50         RTE_SET_USED(group_lookup_table);
  51         RTE_SET_USED(hash_val_a);
  52         RTE_SET_USED(hash_val_b);
  53         /* Return dummy value, only to avoid compilation breakage */
  54         return 0;
  55 #endif
  56
  57 }