crc32_arm64.mx raw

   1  // Copyright 2017 The Go Authors. All rights reserved.
   2  // Use of this source code is governed by a BSD-style
   3  // license that can be found in the LICENSE file.
   4  
   5  // ARM64-specific hardware-assisted CRC32 algorithms. See crc32.go for a
   6  // description of the interface that each architecture-specific file
   7  // implements.
   8  
   9  package crc32
  10  
  11  import "internal/cpu"
  12  
  13  func castagnoliUpdate(crc uint32, p []byte) uint32
  14  func ieeeUpdate(crc uint32, p []byte) uint32
  15  
  16  func archAvailableCastagnoli() bool {
  17  	return cpu.ARM64.HasCRC32
  18  }
  19  
  20  func archInitCastagnoli() {
  21  	if !cpu.ARM64.HasCRC32 {
  22  		panic("arch-specific crc32 instruction for Castagnoli not available")
  23  	}
  24  }
  25  
  26  func archUpdateCastagnoli(crc uint32, p []byte) uint32 {
  27  	if !cpu.ARM64.HasCRC32 {
  28  		panic("arch-specific crc32 instruction for Castagnoli not available")
  29  	}
  30  
  31  	return ^castagnoliUpdate(^crc, p)
  32  }
  33  
  34  func archAvailableIEEE() bool {
  35  	return cpu.ARM64.HasCRC32
  36  }
  37  
  38  func archInitIEEE() {
  39  	if !cpu.ARM64.HasCRC32 {
  40  		panic("arch-specific crc32 instruction for IEEE not available")
  41  	}
  42  }
  43  
  44  func archUpdateIEEE(crc uint32, p []byte) uint32 {
  45  	if !cpu.ARM64.HasCRC32 {
  46  		panic("arch-specific crc32 instruction for IEEE not available")
  47  	}
  48  
  49  	return ^ieeeUpdate(^crc, p)
  50  }
  51