xs/vendor/github.com/klauspost/reedsolomon/galois_arm64.go

97 lines
2.0 KiB
Go

//go:build !noasm && !appengine && !gccgo
// +build !noasm,!appengine,!gccgo
// Copyright 2015, Klaus Post, see LICENSE for details.
// Copyright 2017, Minio, Inc.
package reedsolomon
//go:noescape
func galMulNEON(low, high, in, out []byte)
//go:noescape
func galMulXorNEON(low, high, in, out []byte)
//go:noescape
func galXorNEON(in, out []byte)
func galMulSlice(c byte, in, out []byte, o *options) {
if c == 1 {
copy(out, in)
return
}
var done int
galMulNEON(mulTableLow[c][:], mulTableHigh[c][:], in, out)
done = (len(in) >> 5) << 5
remain := len(in) - done
if remain > 0 {
mt := mulTable[c][:256]
for i := done; i < len(in); i++ {
out[i] = mt[in[i]]
}
}
}
func galMulSliceXor(c byte, in, out []byte, o *options) {
if c == 1 {
sliceXor(in, out, o)
return
}
var done int
galMulXorNEON(mulTableLow[c][:], mulTableHigh[c][:], in, out)
done = (len(in) >> 5) << 5
remain := len(in) - done
if remain > 0 {
mt := mulTable[c][:256]
for i := done; i < len(in); i++ {
out[i] ^= mt[in[i]]
}
}
}
// simple slice xor
func sliceXor(in, out []byte, o *options) {
galXorNEON(in, out)
done := (len(in) >> 5) << 5
remain := len(in) - done
if remain > 0 {
for i := done; i < len(in); i++ {
out[i] ^= in[i]
}
}
}
// 4-way butterfly
func ifftDIT4(work [][]byte, dist int, log_m01, log_m23, log_m02 ffe, o *options) {
ifftDIT4Ref(work, dist, log_m01, log_m23, log_m02, o)
}
// 4-way butterfly
func fftDIT4(work [][]byte, dist int, log_m01, log_m23, log_m02 ffe, o *options) {
fftDIT4Ref(work, dist, log_m01, log_m23, log_m02, o)
}
// 2-way butterfly forward
func fftDIT2(x, y []byte, log_m ffe, o *options) {
// Reference version:
refMulAdd(x, y, log_m)
// 64 byte aligned, always full.
galXorNEON(x, y)
}
// 2-way butterfly
func ifftDIT2(x, y []byte, log_m ffe, o *options) {
// 64 byte aligned, always full.
galXorNEON(x, y)
// Reference version:
refMulAdd(x, y, log_m)
}
func mulgf16(x, y []byte, log_m ffe, o *options) {
refMul(x, y, log_m)
}