diff options
Diffstat (limited to 'vendor/github.com/klauspost/reedsolomon/galois_ppc64le.go')
-rw-r--r-- | vendor/github.com/klauspost/reedsolomon/galois_ppc64le.go | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/vendor/github.com/klauspost/reedsolomon/galois_ppc64le.go b/vendor/github.com/klauspost/reedsolomon/galois_ppc64le.go new file mode 100644 index 0000000..70f93d6 --- /dev/null +++ b/vendor/github.com/klauspost/reedsolomon/galois_ppc64le.go @@ -0,0 +1,75 @@ +//+build !noasm +//+build !appengine +//+build !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 + } +} |