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Source file src/hash/crc32/crc32_arm64.go

Documentation: hash/crc32

  // Copyright 2017 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  // ARM64-specific hardware-assisted CRC32 algorithms. See crc32.go for a
  // description of the interface that each architecture-specific file
  // implements.
  
  package crc32
  
  func supportsCRC32() bool
  func castagnoliUpdate(crc uint32, p []byte) uint32
  func ieeeUpdate(crc uint32, p []byte) uint32
  
  var hasCRC32 = supportsCRC32()
  
  func archAvailableCastagnoli() bool {
  	return hasCRC32
  }
  
  func archInitCastagnoli() {
  	if !hasCRC32 {
  		panic("arch-specific crc32 instruction for Catagnoli not available")
  	}
  }
  
  func archUpdateCastagnoli(crc uint32, p []byte) uint32 {
  	if !hasCRC32 {
  		panic("arch-specific crc32 instruction for Castagnoli not available")
  	}
  
  	return ^castagnoliUpdate(^crc, p)
  }
  
  func archAvailableIEEE() bool {
  	return hasCRC32
  }
  
  func archInitIEEE() {
  	if !hasCRC32 {
  		panic("arch-specific crc32 instruction for IEEE not available")
  	}
  }
  
  func archUpdateIEEE(crc uint32, p []byte) uint32 {
  	if !hasCRC32 {
  		panic("arch-specific crc32 instruction for IEEE not available")
  	}
  
  	return ^ieeeUpdate(^crc, p)
  }
  

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