github.com/apache/arrow/go/v14@v14.0.1/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  
    19  package utils
    20  
    21  import (
    22  	"os"
    23  	"strings"
    24  )
    25  import "golang.org/x/sys/cpu"
    26  
    27  func init() {
    28  	// Added ability to enable extension via environment:
    29  	// ARM_ENABLE_EXT=NEON go test
    30  	if ext, ok := os.LookupEnv("ARM_ENABLE_EXT"); ok {
    31  		exts := strings.Split(ext, ",")
    32  
    33  		for _, x := range exts {
    34  			switch x {
    35  			case "NEON":
    36  				cpu.ARM64.HasASIMD = true
    37  			case "AES":
    38  				cpu.ARM64.HasAES = true
    39  			case "PMULL":
    40  				cpu.ARM64.HasPMULL = true
    41  			default:
    42  				cpu.ARM64.HasASIMD = false
    43  				cpu.ARM64.HasAES = false
    44  				cpu.ARM64.HasPMULL = false
    45  			}
    46  		}
    47  	}
    48  	if cpu.ARM64.HasASIMD {
    49  		minmaxFuncs.i32 = int32MaxMinNEON
    50  		minmaxFuncs.ui32 = uint32MaxMinNEON
    51  		minmaxFuncs.i64 = int64MaxMinNEON
    52  		minmaxFuncs.ui64 = uint64MaxMinNEON
    53  	} else {
    54  		minmaxFuncs.i32 = int32MinMax
    55  		minmaxFuncs.ui32 = uint32MinMax
    56  		minmaxFuncs.i64 = int64MinMax
    57  		minmaxFuncs.ui64 = uint64MinMax
    58  	}
    59  
    60  	// haven't yet generated the NEON arm64 for these
    61  	minmaxFuncs.i8 = int8MinMax
    62  	minmaxFuncs.ui8 = uint8MinMax
    63  	minmaxFuncs.i16 = int16MinMax
    64  	minmaxFuncs.ui16 = uint16MinMax
    65  }