github.com/apache/arrow/go/v10@v10.0.1/parquet/internal/bmi/bitmap_neon_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  // +build !noasm
    18  
    19  package bmi
    20  
    21  import "unsafe"
    22  
    23  //go:noescape
    24  func _extract_bits_neon(bitmap, selectBitmap uint64) (res uint64)
    25  
    26  // There is no single instruction similar with 'pext' on Arm64.
    27  // The equivalent of 'pext' was implemented with Arm64 Neon for Parallel Bits Extract 
    28  func extractBitsNEON(bitmap, selectBitmap uint64) uint64 {
    29  	return _extract_bits_neon(bitmap, selectBitmap)
    30  }
    31  
    32  //go:noescape
    33  func _levels_to_bitmap_neon(levels unsafe.Pointer, numLevels int, rhs int16) (res uint64)
    34  
    35  // greaterThanBitmapNEON builds a bitmap where each set bit indicates the corresponding level
    36  // is greater than the rhs value.
    37  func greaterThanBitmapNEON(levels []int16, rhs int16) uint64 {
    38  	if len(levels) == 0 {
    39  		return 0
    40  	}
    41  
    42  	var (
    43  		p1 = unsafe.Pointer(&levels[0])
    44  		p2 = len(levels)
    45  		p3 = rhs
    46  	)
    47  
    48  	return _levels_to_bitmap_neon(p1, p2, p3)
    49  }