1// Licensed to the Apache Software Foundation (ASF) under one
2// or more contributor license agreements. See the NOTICE file
3// distributed with this work for additional information
4// regarding copyright ownership. The ASF licenses this file
5// to you under the Apache License, Version 2.0 (the
6// "License"); you may not use this file except in compliance
7// with the License. You may obtain a copy of the License at
8//
9// http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing, software
12// distributed under the License is distributed on an "AS IS" BASIS,
13// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14// See the License for the specific language governing permissions and
15// limitations under the License.
16
17#include <arch.h>
18#include <stdint.h>
19
20#if !defined(__ARM_NEON) && !defined(__ARM_NEON__)
21// don't compile this for ARM, the pure go lookup table version
22// is more performant anyways since ARM doesn't have a BMI2/pext_u64
23// instruction we can call directly.
24uint64_t FULL_NAME(extract_bits)(uint64_t bitmap, uint64_t select_bitmap) {
25#if defined(__BMI2__)
26 return (uint64_t)(_pext_u64(bitmap, select_bitmap));
27#else
28 uint64_t res = 0;
29 for (uint64_t bp = 1; select_bitmap != 0; bp += bp) {
30 if (bitmap & select_bitmap & -select_bitmap) {
31 res |= bp;
32 }
33 select_bitmap &= (select_bitmap - 1);
34 }
35 return res;
36#endif
37}
38
39#endif
40
41uint64_t FULL_NAME(levels_to_bitmap)(const int16_t* levels, const int num_levels, const int16_t rhs) {
42 uint64_t mask = 0;
43 for (int x = 0; x < num_levels; x++) {
44 mask |= (uint64_t)(levels[x] > rhs ? 1 : 0) << x;
45 }
46 return mask;
47}
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