// The interface that they implement is as follows:
//
//    // archAvailableIEEE reports whether an architecture-specific CRC32-IEEE
//    // algorithm is available.
//    archAvailableIEEE() bool
//
//    // archInitIEEE initializes the architecture-specific CRC3-IEEE algorithm.
//    // It can only be called if archAvailableIEEE() returns true.
//    archInitIEEE()
//

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build !amd64 && !s390x && !ppc64le && !arm64

package crc32

func archAvailableIEEE() bool                    { return false }
func archInitIEEE()                              { panic("not available") }
func archUpdateIEEE(crc uint32, p []byte) uint32 { panic("not available") }

func archUpdateCastagnoli(crc uint32, p []byte) uint32 {
	if !cpu.ARM64.HasCRC32 {
		panic("arch-specific crc32 instruction for Castagnoli not available")
	}

	return ^castagnoliUpdate(^crc, p)
}

func archAvailableIEEE() bool {
	return cpu.ARM64.HasCRC32
}

func archInitIEEE() {
	if !cpu.ARM64.HasCRC32 {
		panic("arch-specific crc32 instruction for IEEE not available")
	}
}

		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.

		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.

		crc = castagnoliShift(castagnoliSSE42TableK1, crcAB) ^ crcC
		p = p[castagnoliK1*3:]
	}

	// Use the simple implementation for what's left.
	crc = castagnoliSSE42(crc, p)
	return ^crc
}

func archAvailableIEEE() bool {
	return cpu.X86.HasPCLMULQDQ && cpu.X86.HasSSE41
}

var archIeeeTable8 *slicing8Table

func archInitIEEE() {
	if !cpu.X86.HasPCLMULQDQ || !cpu.X86.HasSSE41 {
		panic("not available")
	}

		t2 := slicingMakeTable(poly)
		f2 := func(crc uint32, b []byte) uint32 {
			return slicingUpdate(crc, t2, b)
		}
		testCrossCheck(t, f1, f2)
	}
}

func TestArchIEEE(t *testing.T) {
	if !archAvailableIEEE() {
		t.Skip("Arch-specific IEEE not available.")
	}
	archInitIEEE()
	slicingTable := slicingMakeTable(IEEE)
	testCrossCheck(t, archUpdateIEEE, func(crc uint32, b []byte) uint32 {