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