Source file src/pkg/hash/crc32/crc32_arm64.go

     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 Catagnoli 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	

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