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78 lines
1.6 KiB
78 lines
1.6 KiB
9 years ago
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//+build !noasm
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//+build !appengine
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// Copyright 2015, Klaus Post, see LICENSE for details.
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package reedsolomon
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import (
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"github.com/klauspost/cpuid"
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)
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//go:noescape
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func galMulSSSE3(low, high, in, out []byte)
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//go:noescape
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func galMulSSSE3Xor(low, high, in, out []byte)
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//go:noescape
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func galMulAVX2Xor(low, high, in, out []byte)
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//go:noescape
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func galMulAVX2(low, high, in, out []byte)
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// This is what the assembler rountes does in blocks of 16 bytes:
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/*
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func galMulSSSE3(low, high, in, out []byte) {
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for n, input := range in {
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l := input & 0xf
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h := input >> 4
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out[n] = low[l] ^ high[h]
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}
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}
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func galMulSSSE3Xor(low, high, in, out []byte) {
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for n, input := range in {
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l := input & 0xf
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h := input >> 4
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out[n] ^= low[l] ^ high[h]
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}
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}
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*/
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func galMulSlice(c byte, in, out []byte) {
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var done int
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if cpuid.CPU.AVX2() {
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galMulAVX2(mulTableLow[c][:], mulTableHigh[c][:], in, out)
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done = (len(in) >> 5) << 5
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} else if cpuid.CPU.SSSE3() {
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galMulSSSE3(mulTableLow[c][:], mulTableHigh[c][:], in, out)
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done = (len(in) >> 4) << 4
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}
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remain := len(in) - done
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if remain > 0 {
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mt := mulTable[c]
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for i := done; i < len(in); i++ {
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out[i] = mt[in[i]]
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}
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}
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}
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func galMulSliceXor(c byte, in, out []byte) {
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var done int
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if cpuid.CPU.AVX2() {
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galMulAVX2Xor(mulTableLow[c][:], mulTableHigh[c][:], in, out)
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done = (len(in) >> 5) << 5
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} else if cpuid.CPU.SSSE3() {
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galMulSSSE3Xor(mulTableLow[c][:], mulTableHigh[c][:], in, out)
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done = (len(in) >> 4) << 4
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}
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remain := len(in) - done
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if remain > 0 {
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mt := mulTable[c]
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for i := done; i < len(in); i++ {
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out[i] ^= mt[in[i]]
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}
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}
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}
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