mirror of https://gogs.blitter.com/RLabs/xs
59 lines
1.5 KiB
Go
59 lines
1.5 KiB
Go
|
//go:build (!amd64 || noasm || appengine || gccgo) && (!arm64 || noasm || appengine || gccgo) && (!ppc64le || noasm || appengine || gccgo)
|
||
|
|
// +build !amd64 noasm appengine gccgo
|
||
|
|
// +build !arm64 noasm appengine gccgo
|
||
|
|
// +build !ppc64le noasm appengine gccgo
|
||
|
|
|
||
|
|
// Copyright 2015, Klaus Post, see LICENSE for details.
|
||
|
|
|
||
|
|
package reedsolomon
|
||
|
|
|
||
|
|
import "encoding/binary"
|
||
|
|
|
||
|
|
func galMulSlice(c byte, in, out []byte, o *options) {
|
||
|
|
out = out[:len(in)]
|
||
|
|
if c == 1 {
|
||
|
|
copy(out, in)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
mt := mulTable[c][:256]
|
||
|
|
for n, input := range in {
|
||
|
|
out[n] = mt[input]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func galMulSliceXor(c byte, in, out []byte, o *options) {
|
||
|
|
out = out[:len(in)]
|
||
|
|
if c == 1 {
|
||
|
|
sliceXor(in, out, o)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
mt := mulTable[c][:256]
|
||
|
|
for n, input := range in {
|
||
|
|
out[n] ^= mt[input]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// simple slice xor
|
||
|
|
func sliceXor(in, out []byte, _ *options) {
|
||
|
|
for len(out) >= 32 {
|
||
|
|
inS := in[:32]
|
||
|
|
v0 := binary.LittleEndian.Uint64(out[:]) ^ binary.LittleEndian.Uint64(inS[:])
|
||
|
|
v1 := binary.LittleEndian.Uint64(out[8:]) ^ binary.LittleEndian.Uint64(inS[8:])
|
||
|
|
v2 := binary.LittleEndian.Uint64(out[16:]) ^ binary.LittleEndian.Uint64(inS[16:])
|
||
|
|
v3 := binary.LittleEndian.Uint64(out[24:]) ^ binary.LittleEndian.Uint64(inS[24:])
|
||
|
|
binary.LittleEndian.PutUint64(out[:], v0)
|
||
|
|
binary.LittleEndian.PutUint64(out[8:], v1)
|
||
|
|
binary.LittleEndian.PutUint64(out[16:], v2)
|
||
|
|
binary.LittleEndian.PutUint64(out[24:], v3)
|
||
|
|
out = out[32:]
|
||
|
|
in = in[32:]
|
||
|
|
}
|
||
|
|
for n, input := range in {
|
||
|
|
out[n] ^= input
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func init() {
|
||
|
|
defaultOptions.useAVX512 = false
|
||
|
|
}
|