mirror of https://gogs.blitter.com/RLabs/xs
103 lines
2.1 KiB
Go
103 lines
2.1 KiB
Go
//go:build !noasm && !appengine && !gccgo
|
|
// +build !noasm,!appengine,!gccgo
|
|
|
|
// Copyright 2015, Klaus Post, see LICENSE for details.
|
|
// Copyright 2018, Minio, Inc.
|
|
|
|
package reedsolomon
|
|
|
|
//go:noescape
|
|
func galMulPpc(low, high, in, out []byte)
|
|
|
|
//go:noescape
|
|
func galMulPpcXor(low, high, in, out []byte)
|
|
|
|
// This is what the assembler routines do in blocks of 16 bytes:
|
|
/*
|
|
func galMulPpc(low, high, in, out []byte) {
|
|
for n, input := range in {
|
|
l := input & 0xf
|
|
h := input >> 4
|
|
out[n] = low[l] ^ high[h]
|
|
}
|
|
}
|
|
func galMulPpcXor(low, high, in, out []byte) {
|
|
for n, input := range in {
|
|
l := input & 0xf
|
|
h := input >> 4
|
|
out[n] ^= low[l] ^ high[h]
|
|
}
|
|
}
|
|
*/
|
|
|
|
func galMulSlice(c byte, in, out []byte, o *options) {
|
|
if c == 1 {
|
|
copy(out, in)
|
|
return
|
|
}
|
|
done := (len(in) >> 4) << 4
|
|
if done > 0 {
|
|
galMulPpc(mulTableLow[c][:], mulTableHigh[c][:], in[:done], out)
|
|
}
|
|
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
|
|
}
|
|
done := (len(in) >> 4) << 4
|
|
if done > 0 {
|
|
galMulPpcXor(mulTableLow[c][:], mulTableHigh[c][:], in[:done], out)
|
|
}
|
|
remain := len(in) - done
|
|
if remain > 0 {
|
|
mt := mulTable[c][:256]
|
|
for i := done; i < len(in); i++ {
|
|
out[i] ^= mt[in[i]]
|
|
}
|
|
}
|
|
}
|
|
|
|
// slice galois add
|
|
func sliceXor(in, out []byte, o *options) {
|
|
for n, input := range in {
|
|
out[n] ^= input
|
|
}
|
|
}
|
|
|
|
// 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)
|
|
sliceXor(x, y, o)
|
|
}
|
|
|
|
// 2-way butterfly inverse
|
|
func ifftDIT2(x, y []byte, log_m ffe, o *options) {
|
|
// Reference version:
|
|
sliceXor(x, y, o)
|
|
refMulAdd(x, y, log_m)
|
|
}
|
|
|
|
func mulgf16(x, y []byte, log_m ffe, o *options) {
|
|
refMul(x, y, log_m)
|
|
}
|