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accum_scalar.go
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/
accum_scalar.go
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// Copyright 2021 ByteDance Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package xxhash3
import (
"github.com/bytedance/gopkg/internal/runtimex"
"unsafe"
)
func accumScalar(xacc *[8]uint64, xinput, xsecret unsafe.Pointer, l uintptr) {
j := uintptr(0)
// Loops over block and process 16*8*8=1024 bytes of data each iteration
for ; j < (l-1)/1024; j++ {
k := xsecret
for i := 0; i < 16; i++ {
dataVec0 := runtimex.ReadUnaligned64(xinput)
keyVec := dataVec0 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*0))
xacc[1] += dataVec0
xacc[0] += (keyVec & 0xffffffff) * (keyVec >> 32)
dataVec1 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*1))
keyVec1 := dataVec1 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*1))
xacc[0] += dataVec1
xacc[1] += (keyVec1 & 0xffffffff) * (keyVec1 >> 32)
dataVec2 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*2))
keyVec2 := dataVec2 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*2))
xacc[3] += dataVec2
xacc[2] += (keyVec2 & 0xffffffff) * (keyVec2 >> 32)
dataVec3 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*3))
keyVec3 := dataVec3 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*3))
xacc[2] += dataVec3
xacc[3] += (keyVec3 & 0xffffffff) * (keyVec3 >> 32)
dataVec4 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*4))
keyVec4 := dataVec4 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*4))
xacc[5] += dataVec4
xacc[4] += (keyVec4 & 0xffffffff) * (keyVec4 >> 32)
dataVec5 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*5))
keyVec5 := dataVec5 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*5))
xacc[4] += dataVec5
xacc[5] += (keyVec5 & 0xffffffff) * (keyVec5 >> 32)
dataVec6 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*6))
keyVec6 := dataVec6 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*6))
xacc[7] += dataVec6
xacc[6] += (keyVec6 & 0xffffffff) * (keyVec6 >> 32)
dataVec7 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*7))
keyVec7 := dataVec7 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*7))
xacc[6] += dataVec7
xacc[7] += (keyVec7 & 0xffffffff) * (keyVec7 >> 32)
xinput, k = unsafe.Pointer(uintptr(xinput)+_stripe), unsafe.Pointer(uintptr(k)+8)
}
// scramble xacc
xacc[0] ^= xacc[0] >> 47
xacc[0] ^= xsecret_128
xacc[0] *= prime32_1
xacc[1] ^= xacc[1] >> 47
xacc[1] ^= xsecret_136
xacc[1] *= prime32_1
xacc[2] ^= xacc[2] >> 47
xacc[2] ^= xsecret_144
xacc[2] *= prime32_1
xacc[3] ^= xacc[3] >> 47
xacc[3] ^= xsecret_152
xacc[3] *= prime32_1
xacc[4] ^= xacc[4] >> 47
xacc[4] ^= xsecret_160
xacc[4] *= prime32_1
xacc[5] ^= xacc[5] >> 47
xacc[5] ^= xsecret_168
xacc[5] *= prime32_1
xacc[6] ^= xacc[6] >> 47
xacc[6] ^= xsecret_176
xacc[6] *= prime32_1
xacc[7] ^= xacc[7] >> 47
xacc[7] ^= xsecret_184
xacc[7] *= prime32_1
}
l -= _block * j
// last partial block (at most 1024 bytes)
if l > 0 {
k := xsecret
i := uintptr(0)
for ; i < (l-1)/_stripe; i++ {
dataVec := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*0))
keyVec := dataVec ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*0))
xacc[1] += dataVec
xacc[0] += (keyVec & 0xffffffff) * (keyVec >> 32)
dataVec1 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*1))
keyVec1 := dataVec1 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*1))
xacc[0] += dataVec1
xacc[1] += (keyVec1 & 0xffffffff) * (keyVec1 >> 32)
dataVec2 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*2))
keyVec2 := dataVec2 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*2))
xacc[3] += dataVec2
xacc[2] += (keyVec2 & 0xffffffff) * (keyVec2 >> 32)
dataVec3 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*3))
keyVec3 := dataVec3 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*3))
xacc[2] += dataVec3
xacc[3] += (keyVec3 & 0xffffffff) * (keyVec3 >> 32)
dataVec4 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*4))
keyVec4 := dataVec4 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*4))
xacc[5] += dataVec4
xacc[4] += (keyVec4 & 0xffffffff) * (keyVec4 >> 32)
dataVec5 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*5))
keyVec5 := dataVec5 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*5))
xacc[4] += dataVec5
xacc[5] += (keyVec5 & 0xffffffff) * (keyVec5 >> 32)
dataVec6 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*6))
keyVec6 := dataVec6 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*6))
xacc[7] += dataVec6
xacc[6] += (keyVec6 & 0xffffffff) * (keyVec6 >> 32)
dataVec7 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*7))
keyVec7 := dataVec7 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*7))
xacc[6] += dataVec7
xacc[7] += (keyVec7 & 0xffffffff) * (keyVec7 >> 32)
xinput, k = unsafe.Pointer(uintptr(xinput)+_stripe), unsafe.Pointer(uintptr(k)+8)
}
l -= _stripe * i
// last stripe (align to last 64 bytes)
if l > 0 {
xinput = unsafe.Pointer(uintptr(xinput) - uintptr(_stripe-l))
k = unsafe.Pointer(uintptr(xsecret) + 121)
dataVec := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*0))
keyVec := dataVec ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*0))
xacc[1] += dataVec
xacc[0] += (keyVec & 0xffffffff) * (keyVec >> 32)
dataVec1 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*1))
keyVec1 := dataVec1 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*1))
xacc[0] += dataVec1
xacc[1] += (keyVec1 & 0xffffffff) * (keyVec1 >> 32)
dataVec2 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*2))
keyVec2 := dataVec2 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*2))
xacc[3] += dataVec2
xacc[2] += (keyVec2 & 0xffffffff) * (keyVec2 >> 32)
dataVec3 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*3))
keyVec3 := dataVec3 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*3))
xacc[2] += dataVec3
xacc[3] += (keyVec3 & 0xffffffff) * (keyVec3 >> 32)
dataVec4 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*4))
keyVec4 := dataVec4 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*4))
xacc[5] += dataVec4
xacc[4] += (keyVec4 & 0xffffffff) * (keyVec4 >> 32)
dataVec5 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*5))
keyVec5 := dataVec5 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*5))
xacc[4] += dataVec5
xacc[5] += (keyVec5 & 0xffffffff) * (keyVec5 >> 32)
dataVec6 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*6))
keyVec6 := dataVec6 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*6))
xacc[7] += dataVec6
xacc[6] += (keyVec6 & 0xffffffff) * (keyVec6 >> 32)
dataVec7 := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*7))
keyVec7 := dataVec7 ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*7))
xacc[6] += dataVec7
xacc[7] += (keyVec7 & 0xffffffff) * (keyVec7 >> 32)
}
}
}