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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build !noasm
// +build !noasm
package utils
import (
"os"
"strings"
"golang.org/x/sys/cpu"
)
var byteToBoolFunc func([]byte, []bool)
func init() {
// Added ability to enable extension via environment:
// ARM_ENABLE_EXT=NEON go test
if ext, ok := os.LookupEnv("ARM_ENABLE_EXT"); ok {
exts := strings.Split(ext, ",")
for _, x := range exts {
switch x {
case "NEON":
cpu.ARM64.HasASIMD = true
case "AES":
cpu.ARM64.HasAES = true
case "PMULL":
cpu.ARM64.HasPMULL = true
default:
cpu.ARM64.HasASIMD = false
cpu.ARM64.HasAES = false
cpu.ARM64.HasPMULL = false
}
}
}
// if the cpu supports Arm64 Neon then use SIMD to accelerate the conversion
// of a bitmap to a slice of bools in an optimized fashion, otherwise fallback
// to the pure go implementation
if cpu.ARM64.HasASIMD {
byteToBoolFunc = bytesToBoolsNEON
} else {
byteToBoolFunc = bytesToBoolsGo
}
}
// BytesToBools efficiently populates a slice of booleans from an input bitmap
func BytesToBools(in []byte, out []bool) {
byteToBoolFunc(in, out)
}
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