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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_ppc64le.go

// 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.

package crc32

import (
	"unsafe"
)

const (
	vecMinLen    = 16
	vecAlignMask = 15 // align to 16 bytes
	crcIEEE      = 1
	crcCast      = 2
)

//go:noescape
func ppc64SlicingUpdateBy8(crc uint32, table8 *slicing8Table, p []byte) uint32

// this function requires the buffer to be 16 byte aligned and > 16 bytes long
//go:noescape
func vectorCrc32(crc uint32, poly uint32, p []byte) uint32

var archCastagnoliTable8 *slicing8Table

func archInitCastagnoli() {
	archCastagnoliTable8 = slicingMakeTable(Castagnoli)
}

func archUpdateCastagnoli(crc uint32, p []byte) uint32 {
	if len(p) >= 4*vecMinLen {
		// If not aligned then process the initial unaligned bytes

if uint64(uintptr(unsafe.Pointer(&p[0])))&uint64(vecAlignMask) != 0 {
			align := uint64(uintptr(unsafe.Pointer(&p[0]))) & uint64(vecAlignMask)
			newlen := vecMinLen - align
			crc = ppc64SlicingUpdateBy8(crc, archCastagnoliTable8, p[:newlen])
			p = p[newlen:]
		}
		// p should be aligned now
		aligned := len(p) & ^vecAlignMask
		crc = vectorCrc32(crc, crcCast, p[:aligned])
		p = p[aligned:]
	}
	if len(p) == 0 {
		return crc
	}
	return ppc64SlicingUpdateBy8(crc, archCastagnoliTable8, p)
}

func archAvailableIEEE() bool {
	return true
}
func archAvailableCastagnoli() bool {
	return true
}

var archIeeeTable8 *slicing8Table

func archInitIEEE() {
	// 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 {

// Check if vector code should be used.  If not aligned, then handle those
	// first up to the aligned bytes.

if len(p) >= 4*vecMinLen {
		if uint64(uintptr(unsafe.Pointer(&p[0])))&uint64(vecAlignMask) != 0 {
			align := uint64(uintptr(unsafe.Pointer(&p[0]))) & uint64(vecAlignMask)
			newlen := vecMinLen - align
			crc = ppc64SlicingUpdateBy8(crc, archIeeeTable8, p[:newlen])
			p = p[newlen:]
		}
		aligned := len(p) & ^vecAlignMask
		crc = vectorCrc32(crc, crcIEEE, p[:aligned])
		p = p[aligned:]
	}
	if len(p) == 0 {
		return crc
	}
	return ppc64SlicingUpdateBy8(crc, archIeeeTable8, p)
}

${this.title}

Code Editor : crc32_ppc64le.go