github.com/apache/arrow/go/v7@v7.0.1/parquet/internal/utils/min_max_amd64.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  // +build !noasm
    18  
    19  package utils
    20  
    21  import "golang.org/x/sys/cpu"
    22  
    23  func init() {
    24  	// if the CPU supports AVX2 or SSE4 then let's use those to benefit from SIMD
    25  	// to accelerate the performance for finding the min and max for an integral slice.
    26  	// otherwise fallback to a pure go implementation if the cpu doesn't have these features.
    27  	if cpu.X86.HasAVX2 {
    28  		minmaxFuncs.i32 = int32MaxMinAVX2
    29  		minmaxFuncs.ui32 = uint32MaxMinAVX2
    30  		minmaxFuncs.i64 = int64MaxMinAVX2
    31  		minmaxFuncs.ui64 = uint64MaxMinAVX2
    32  	} else if cpu.X86.HasSSE42 {
    33  		minmaxFuncs.i32 = int32MaxMinSSE4
    34  		minmaxFuncs.ui32 = uint32MaxMinSSE4
    35  		minmaxFuncs.i64 = int64MaxMinSSE4
    36  		minmaxFuncs.ui64 = uint64MaxMinSSE4
    37  	} else {
    38  		minmaxFuncs.i32 = int32MinMax
    39  		minmaxFuncs.ui32 = uint32MinMax
    40  		minmaxFuncs.i64 = int64MinMax
    41  		minmaxFuncs.ui64 = uint64MinMax
    42  	}
    43  }