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Name	Size	Permission
crc32.go	7.67 KB	-rw-r--r--
crc32_amd64.go	6.78 KB	-rw-r--r--
crc32_amd64.s	5.4 KB	-rw-r--r--
crc32_arm64.go	1.18 KB	-rw-r--r--
crc32_arm64.s	1.46 KB	-rw-r--r--
crc32_generic.go	2.52 KB	-rw-r--r--
crc32_otherarch.go	671 B	-rw-r--r--
crc32_ppc64le.go	2.24 KB	-rw-r--r--
crc32_ppc64le.s	13.63 KB	-rw-r--r--
crc32_s390x.go	2.1 KB	-rw-r--r--
crc32_s390x.s	8.2 KB	-rw-r--r--
crc32_table_ppc64le.s	113.32 KB	-rw-r--r--
crc32_test.go	11.67 KB	-rw-r--r--
example_test.go	1 KB	-rw-r--r--
gen_const_ppc64le.go	4.49 KB	-rw-r--r--

Code Editor : crc32_s390x.go

// Copyright 2016 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.

package crc32

const (
	vxMinLen    = 64
	vxAlignMask = 15 // align to 16 bytes
)

// hasVectorFacility reports whether the machine has the z/Architecture
// vector facility installed and enabled.
func hasVectorFacility() bool

var hasVX = hasVectorFacility()

// vectorizedCastagnoli implements CRC32 using vector instructions.
// It is defined in crc32_s390x.s.
//go:noescape
func vectorizedCastagnoli(crc uint32, p []byte) uint32

// vectorizedIEEE implements CRC32 using vector instructions.
// It is defined in crc32_s390x.s.
//go:noescape
func vectorizedIEEE(crc uint32, p []byte) uint32

func archAvailableCastagnoli() bool {
	return hasVX
}

var archCastagnoliTable8 *slicing8Table

func archInitCastagnoli() {
	if !hasVX {
		panic("not available")
	}
	// We still use slicing-by-8 for small buffers.
	archCastagnoliTable8 = slicingMakeTable(Castagnoli)
}

// archUpdateCastagnoli calculates the checksum of p using
// vectorizedCastagnoli.
func archUpdateCastagnoli(crc uint32, p []byte) uint32 {
	if !hasVX {
		panic("not available")
	}
	// Use vectorized function if data length is above threshold.
	if len(p) >= vxMinLen {
		aligned := len(p) & ^vxAlignMask
		crc = vectorizedCastagnoli(crc, p[:aligned])
		p = p[aligned:]
	}
	if len(p) == 0 {
		return crc
	}
	return slicingUpdate(crc, archCastagnoliTable8, p)
}

func archAvailableIEEE() bool {
	return hasVX
}

var archIeeeTable8 *slicing8Table

func archInitIEEE() {
	if !hasVX {
		panic("not available")
	}
	// We still use slicing-by-8 for small buffers.
	archIeeeTable8 = slicingMakeTable(IEEE)
}

// archUpdateIEEE calculates the checksum of p using vectorizedIEEE.
func archUpdateIEEE(crc uint32, p []byte) uint32 {
	if !hasVX {
		panic("not available")
	}
	// Use vectorized function if data length is above threshold.
	if len(p) >= vxMinLen {
		aligned := len(p) & ^vxAlignMask
		crc = vectorizedIEEE(crc, p[:aligned])
		p = p[aligned:]
	}
	if len(p) == 0 {
		return crc
	}
	return slicingUpdate(crc, archIeeeTable8, p)
}

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Code Editor : crc32_s390x.go