github.com/apache/arrow/go/v10@v10.0.1/internal/utils/min_max_arm64.go (about)

     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  //go:build !noasm
    18  // +build !noasm
    19  
    20  package utils
    21  
    22  import (
    23  	"os"
    24  	"strings"
    25  )
    26  import "golang.org/x/sys/cpu"
    27  
    28  func init() {
    29  	// Added ability to enable extension via environment:
    30  	// ARM_ENABLE_EXT=NEON go test
    31  	if ext, ok := os.LookupEnv("ARM_ENABLE_EXT"); ok {
    32  		exts := strings.Split(ext, ",")
    33  
    34  		for _, x := range exts {
    35  			switch x {
    36  			case "NEON":
    37  				cpu.ARM64.HasASIMD = true
    38  			case "AES":
    39  				cpu.ARM64.HasAES = true
    40  			case "PMULL":
    41  				cpu.ARM64.HasPMULL = true
    42  			default:
    43  				cpu.ARM64.HasASIMD = false
    44  				cpu.ARM64.HasAES = false
    45  				cpu.ARM64.HasPMULL = false
    46  			}
    47  		}
    48  	}
    49  	if cpu.ARM64.HasASIMD {
    50  		minmaxFuncs.i32 = int32MaxMinNEON
    51  		minmaxFuncs.ui32 = uint32MaxMinNEON
    52  		minmaxFuncs.i64 = int64MaxMinNEON
    53  		minmaxFuncs.ui64 = uint64MaxMinNEON
    54  	} else {
    55  		minmaxFuncs.i32 = int32MinMax
    56  		minmaxFuncs.ui32 = uint32MinMax
    57  		minmaxFuncs.i64 = int64MinMax
    58  		minmaxFuncs.ui64 = uint64MinMax
    59  	}
    60  
    61  	// haven't yet generated the NEON arm64 for these
    62  	minmaxFuncs.i8 = int8MinMax
    63  	minmaxFuncs.ui8 = uint8MinMax
    64  	minmaxFuncs.i16 = int16MinMax
    65  	minmaxFuncs.ui16 = uint16MinMax
    66  }