// 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 xxh3_raw

import (
	"math/bits"
	"unsafe"

	"github.com/bytedance/gopkg/internal/runtimex"
)

const (
	_stripe = 64
	_block  = 1024

	prime32_1 = 2654435761
	prime32_2 = 2246822519
	prime32_3 = 3266489917

	prime64_1 = 11400714785074694791
	prime64_2 = 14029467366897019727
	prime64_3 = 1609587929392839161
	prime64_4 = 9650029242287828579
	prime64_5 = 2870177450012600261
)

var xsecret = unsafe.Pointer(&[192]uint8{
	/* 	0 	*/ 0xb8, 0xfe, 0x6c, 0x39, 0x23, 0xa4, 0x4b, 0xbe, 0x7c, 0x01, 0x81, 0x2c, 0xf7, 0x21, 0xad, 0x1c,
	/* 	16 	*/ 0xde, 0xd4, 0x6d, 0xe9, 0x83, 0x90, 0x97, 0xdb, 0x72, 0x40, 0xa4, 0xa4, 0xb7, 0xb3, 0x67, 0x1f,
	/* 	32 	*/ 0xcb, 0x79, 0xe6, 0x4e, 0xcc, 0xc0, 0xe5, 0x78, 0x82, 0x5a, 0xd0, 0x7d, 0xcc, 0xff, 0x72, 0x21,
	/* 	48 	*/ 0xb8, 0x08, 0x46, 0x74, 0xf7, 0x43, 0x24, 0x8e, 0xe0, 0x35, 0x90, 0xe6, 0x81, 0x3a, 0x26, 0x4c,
	/* 	64 	*/ 0x3c, 0x28, 0x52, 0xbb, 0x91, 0xc3, 0x00, 0xcb, 0x88, 0xd0, 0x65, 0x8b, 0x1b, 0x53, 0x2e, 0xa3,
	/* 	80 	*/ 0x71, 0x64, 0x48, 0x97, 0xa2, 0x0d, 0xf9, 0x4e, 0x38, 0x19, 0xef, 0x46, 0xa9, 0xde, 0xac, 0xd8,
	/* 	96 	*/ 0xa8, 0xfa, 0x76, 0x3f, 0xe3, 0x9c, 0x34, 0x3f, 0xf9, 0xdc, 0xbb, 0xc7, 0xc7, 0x0b, 0x4f, 0x1d,
	/* 	112	*/ 0x8a, 0x51, 0xe0, 0x4b, 0xcd, 0xb4, 0x59, 0x31, 0xc8, 0x9f, 0x7e, 0xc9, 0xd9, 0x78, 0x73, 0x64,
	/* 	128	*/ 0xea, 0xc5, 0xac, 0x83, 0x34, 0xd3, 0xeb, 0xc3, 0xc5, 0x81, 0xa0, 0xff, 0xfa, 0x13, 0x63, 0xeb,
	/* 	144	*/ 0x17, 0x0d, 0xdd, 0x51, 0xb7, 0xf0, 0xda, 0x49, 0xd3, 0x16, 0x55, 0x26, 0x29, 0xd4, 0x68, 0x9e,
	/* 	160	*/ 0x2b, 0x16, 0xbe, 0x58, 0x7d, 0x47, 0xa1, 0xfc, 0x8f, 0xf8, 0xb8, 0xd1, 0x7a, 0xd0, 0x31, 0xce,
	/* 	176	*/ 0x45, 0xcb, 0x3a, 0x8f, 0x95, 0x16, 0x04, 0x28, 0xaf, 0xd7, 0xfb, 0xca, 0xbb, 0x4b, 0x40, 0x7e,
})

// Hash returns the hash value of the byte slice in 64bits.
func Hash(data []byte) uint64 {
	length := uint64(len(data))
	xinput := *(*unsafe.Pointer)(unsafe.Pointer(&data))

	if length > 240 {
		return hashLarge(xinput, length)
	} else if length > 128 {
		return xxh3Len129To240_64b(xinput, length)
	} else if length > 16 {
		return xxh3Len17To128_64b(xinput, length)
	} else {
		return xxh3Len0To16_64b(xinput, length)
	}
}

// HashString returns the hash value of the string in 64bits.
func HashString(s string) uint64 {
	return Hash([]byte(s))
}

// Hash128 returns the hash value of the byte slice in 128bits.
func Hash128(data []byte) [2]uint64 {
	length := uint64(len(data))
	xinput := *(*unsafe.Pointer)(unsafe.Pointer(&data))

	if length > 240 {
		return hashLarge128(xinput, length)
	} else if length > 128 {
		return xxh3Len129To240_128b(xinput, length)
	} else if length > 16 {
		return xxh3Len17To128_128b(xinput, length)
	} else {
		return xxh3Len0To16_128b(xinput, length)
	}
}

// Hash128String returns the hash value of the string in 128bits.
func Hash128String(s string) [2]uint64 {
	return Hash128([]byte(s))
}

func xxh3Len0To16_64b(xinput unsafe.Pointer, len uint64) uint64 {
	length := uintptr(len)

	if length > 8 {
		inputlo := runtimex.ReadUnaligned64(xinput) ^ (runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+24)) ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+32)))
		inputhi := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-8)) ^ (runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret) + 40))) ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+48))
		acc := len + bits.ReverseBytes64(inputlo) + inputhi + mix(inputlo, inputhi)
		return xxh3Avalanche(acc)
	} else if length >= 4 {
		input1 := runtimex.ReadUnaligned32(xinput)
		input2 := runtimex.ReadUnaligned32(unsafe.Pointer(uintptr(xinput) + length - 4))
		input64 := input2 + input1<<32
		keyed := input64 ^ (runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret) + 8))) ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16))
		return xxh3RRMXMX(keyed, len)
	} else if length > 0 {
		q := (*[4]byte)(xinput)
		combined := (uint64(q[0]) << 16) | (uint64(q[len>>1]) << 24) | (uint64(q[len-1]) << 0) | len<<8
		combined ^= runtimex.ReadUnaligned32(xsecret) ^ runtimex.ReadUnaligned32(unsafe.Pointer(uintptr(xsecret)+4))
		return xxh64Avalanche(combined)
	} else {
		return xxh64Avalanche(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+56)) ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+64)))
	}
}

func xxh3Len17To128_64b(xinput unsafe.Pointer, len uint64) uint64 {
	length := uintptr(len)

	acc := len * prime64_1
	if length > 32 {
		if length > 64 {
			if length > 96 {
				acc += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+48))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+96)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+56))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+104)))
				acc += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-64))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+112)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-56))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+120)))
			}
			acc += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+64)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+40))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+72)))
			acc += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-48))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+80)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-40))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+88)))
		}
		acc += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+32)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+24))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+40)))
		acc += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-32))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+48)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-24))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+56)))
	}
	acc += mix(runtimex.ReadUnaligned64(xinput)^runtimex.ReadUnaligned64(xsecret), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+8)))
	acc += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-16))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+24)))

	return xxh3Avalanche(acc)
}

func xxh3Len129To240_64b(xinput unsafe.Pointer, len uint64) uint64 {
	length := uintptr(len)

	acc := len * prime64_1

	acc += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*0))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*0)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*0+8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*0+8)))
	acc += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*1))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*1)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*1+8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*1+8)))
	acc += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*2))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*2)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*2+8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*2+8)))
	acc += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*3))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*3)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*3+8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*3+8)))
	acc += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*4))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*4)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*4+8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*4+8)))
	acc += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*5))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*5)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*5+8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*5+8)))
	acc += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*6))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*6)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*6+8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*6+8)))
	acc += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*7))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*7)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*7+8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*7+8)))

	acc = xxh3Avalanche(acc)
	nbRounds := uintptr(length >> 4)

	for i := uintptr(8); i < nbRounds; i++ {
		acc += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*i))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*i-125)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16*i+8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16*i-117)))
	}

	acc += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-16))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+119)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+127)))

	return xxh3Avalanche(acc)
}

func hashLarge(p unsafe.Pointer, length uint64) (acc uint64) {
	acc = length * prime64_1

	xacc := [8]uint64{
		prime32_3, prime64_1, prime64_2, prime64_3,
		prime64_4, prime32_2, prime64_5, prime32_1}

	accumScalar(&xacc, p, xsecret, length)
	//merge xacc
	acc += mix(xacc[0]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+11)), xacc[1]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+19)))
	acc += mix(xacc[2]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+27)), xacc[3]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+35)))
	acc += mix(xacc[4]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+43)), xacc[5]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+51)))
	acc += mix(xacc[6]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+59)), xacc[7]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+67)))

	return xxh3Avalanche(acc)
}

func xxh3Len0To16_128b(xinput unsafe.Pointer, len uint64) [2]uint64 {
	length := uintptr(len)

	if length > 8 {
		bitflipl := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+32)) ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+40))
		bitfliph := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+48)) ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+56))
		inputLow := runtimex.ReadUnaligned64(xinput)
		inputHigh := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + length - 8))
		m128High64, m128Low64 := bits.Mul64(inputLow^inputHigh^bitflipl, prime64_1)

		m128Low64 += uint64(length-1) << 54
		inputHigh ^= bitfliph

		m128High64 += inputHigh + uint64(uint32(inputHigh))*(prime32_2-1)
		m128Low64 ^= bits.ReverseBytes64(m128High64)

		h128High64, h128Low64 := bits.Mul64(m128Low64, prime64_2)
		h128High64 += m128High64 * prime64_2

		h128Low64 = xxh3Avalanche(h128Low64)
		h128High64 = xxh3Avalanche(h128High64)

		return [2]uint64{h128High64, h128Low64}

	} else if length >= 4 {
		inputLow := runtimex.ReadUnaligned32(xinput)
		inputHigh := runtimex.ReadUnaligned32(unsafe.Pointer(uintptr(xinput) + uintptr(length-4)))
		input64 := inputLow + (uint64(inputHigh) << 32)
		bitflip := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16)) ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+24))
		keyed := input64 ^ bitflip

		m128High64, m128Low64 := bits.Mul64(keyed, prime64_1+(len)<<2)
		m128High64 += m128Low64 << 1
		m128Low64 ^= m128High64 >> 3

		m128Low64 ^= m128Low64 >> 35
		m128Low64 *= 0x9fb21c651e98df25
		m128Low64 ^= m128Low64 >> 28

		m128High64 = xxh3Avalanche(m128High64)
		return [2]uint64{m128High64, m128Low64}

	} else if length >= 1 {
		q := (*[4]byte)(xinput)
		combinedl := (uint64(q[0]) << 16) | (uint64(q[len>>1]) << 24) | (uint64(q[len-1]) << 0) | len<<8
		combinedh := uint64(bits.RotateLeft32(bits.ReverseBytes32(uint32(combinedl)), 13))

		bitflipl := runtimex.ReadUnaligned32(xsecret) ^ runtimex.ReadUnaligned32(unsafe.Pointer(uintptr(xsecret)+4))
		bitfliph := runtimex.ReadUnaligned32(unsafe.Pointer(uintptr(xsecret)+8)) ^ runtimex.ReadUnaligned32(unsafe.Pointer(uintptr(xsecret)+12))

		keyedLow := combinedl ^ bitflipl
		keyedHigh := combinedh ^ bitfliph

		keyedLow = combinedl ^ bitflipl
		keyedHigh = combinedh ^ bitfliph

		h128Low64 := xxh64Avalanche(keyedLow)
		h128High64 := xxh64Avalanche(keyedHigh)
		return [2]uint64{h128High64, h128Low64}
	}
	bitflipl := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+64)) ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+72))
	bitfliph := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+80)) ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+88))

	h128High64 := xxh64Avalanche(bitfliph)
	h128Low64 := xxh64Avalanche(bitflipl)

	return [2]uint64{h128High64, h128Low64}
}

func xxh3Len17To128_128b(xinput unsafe.Pointer, len uint64) [2]uint64 {
	length := uintptr(len)

	accHigh := uint64(0)
	accLow := len * prime64_1

	if length > 32 {
		if length > 64 {
			if length > 96 {
				accLow += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+48))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+96)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+56))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+104)))
				accLow ^= runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-64)) + runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-56))
				accHigh += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-64))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+112)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-56))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+120)))
				accHigh ^= runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+48)) + runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+56))
			}
			accLow += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+64)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+40))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+72)))
			accLow ^= runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-48)) + runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-40))
			accHigh += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-48))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+80)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-40))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+88)))
			accHigh ^= runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32)) + runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+40))
		}
		accLow += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+32)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+3*8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+40)))
		accLow ^= runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-32)) + runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-3*8))
		accHigh += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-32))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+48)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-3*8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+56)))
		accHigh ^= runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+16)) + runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+3*8))
	}

	accLow += mix(runtimex.ReadUnaligned64(xinput)^runtimex.ReadUnaligned64(xsecret), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+8)))
	accLow ^= runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-16)) + runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-8))
	accHigh += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-16))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+16)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+24)))
	accHigh ^= runtimex.ReadUnaligned64(xinput) + runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+8))

	h128Low := accHigh + accLow
	h128High := (accLow * prime64_1) + (accHigh * prime64_4) + (len * prime64_2)

	h128Low = xxh3Avalanche(h128Low)
	h128High = -xxh3Avalanche(h128High)

	return [2]uint64{h128High, h128Low}
}

func xxh3Len129To240_128b(xinput unsafe.Pointer, len uint64) [2]uint64 {
	length := uintptr(len)
	nbRounds := length &^ 31 / 32
	accLow64 := len * prime64_1
	accHigh64 := uint64(0)

	for i := uintptr(0); i < 4; i++ {
		accLow64 += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32*i))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+32*i)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32*i+8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+32*i+8)))
		accLow64 ^= runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32*i+16)) + runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32*i+24))
		accHigh64 += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32*i+16))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+32*i+16)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32*i+24))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+32*i+24)))
		accHigh64 ^= runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32*i)) + runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32*i+8))
	}

	accLow64 = xxh3Avalanche(accLow64)
	accHigh64 = xxh3Avalanche(accHigh64)

	for i := uintptr(4); i < nbRounds; i++ {
		accHigh64 += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32*i+16))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+32*i-109)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32*i+24))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+32*i-101)))
		accHigh64 ^= runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32*i)) + runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32*i+8))

		accLow64 += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32*i))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+32*i-125)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32*i+8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+32*i-117)))
		accLow64 ^= runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32*i+16)) + runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+32*i+24))
	}

	// last 32 bytes
	accLow64 += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-16))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+103)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-8))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+111)))
	accLow64 ^= runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-32)) + runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-24))
	accHigh64 += mix(runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-32))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+119)), runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-24))^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+127)))
	accHigh64 ^= runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-16)) + runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput)+length-8))

	accHigh64, accLow64 = (accLow64*prime64_1)+(accHigh64*prime64_4)+(len*prime64_2), accHigh64+accLow64

	accLow64 = xxh3Avalanche(accLow64)
	accHigh64 = -xxh3Avalanche(accHigh64)

	return [2]uint64{accHigh64, accLow64}
}

func hashLarge128(p unsafe.Pointer, length uint64) (acc [2]uint64) {
	acc[1] = length * prime64_1
	acc[0] = ^(length * prime64_2)

	xacc := [8]uint64{
		prime32_3, prime64_1, prime64_2, prime64_3,
		prime64_4, prime32_2, prime64_5, prime32_1}

	accumScalar(&xacc, p, xsecret, length)
	// merge xacc
	acc[1] += mix(xacc[0]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+11)), xacc[1]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+19)))
	acc[1] += mix(xacc[2]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+27)), xacc[3]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+35)))
	acc[1] += mix(xacc[4]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+43)), xacc[5]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+51)))
	acc[1] += mix(xacc[6]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+59)), xacc[7]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+67)))

	acc[1] = xxh3Avalanche(acc[1])

	acc[0] += mix(xacc[0]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+117)), xacc[1]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+125)))
	acc[0] += mix(xacc[2]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+133)), xacc[3]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+141)))
	acc[0] += mix(xacc[4]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+149)), xacc[5]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+157)))
	acc[0] += mix(xacc[6]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+165)), xacc[7]^runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret)+173)))
	acc[0] = xxh3Avalanche(acc[0])

	return acc
}

func accumScalar(xacc *[8]uint64, xinput, xsecret unsafe.Pointer, l uint64) {
	j := uint64(0)

	// Loops over block, process 16*8*8=1024 bytes of data each iteration
	for ; j < (l-1)/1024; j++ {
		k := xsecret
		for i := 0; i < 16; i++ {
			for j := uintptr(0); j < 8; j++ {
				dataVec := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*j))
				keyVec := dataVec ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*j))
				xacc[j^1] += dataVec
				xacc[j] += (keyVec & 0xffffffff) * (keyVec >> 32)
			}
			xinput, k = unsafe.Pointer(uintptr(xinput)+_stripe), unsafe.Pointer(uintptr(k)+8)
		}

		// scramble xacc
		for j := uintptr(0); j < 8; j++ {
			xacc[j] ^= xacc[j] >> 47
			xacc[j] ^= runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xsecret) + 128 + 8*j))
			xacc[j] *= prime32_1
		}
	}
	l -= _block * j

	// last partial block (1024 bytes)
	if l > 0 {
		k := xsecret
		i := uint64(0)
		for ; i < (l-1)/_stripe; i++ {
			for j := uintptr(0); j < 8; j++ {
				dataVec := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*j))
				keyVec := dataVec ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*j))
				xacc[j^1] += dataVec
				xacc[j] += (keyVec & 0xffffffff) * (keyVec >> 32)
			}
			xinput, k = unsafe.Pointer(uintptr(xinput)+_stripe), unsafe.Pointer(uintptr(k)+8)
		}
		l -= _stripe * i

		// last stripe (64 bytes)
		if l > 0 {
			xinput = unsafe.Pointer(uintptr(xinput) - uintptr(_stripe-l))
			k = unsafe.Pointer(uintptr(xsecret) + 121)

			for j := uintptr(0); j < 8; j++ {
				dataVec := runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(xinput) + 8*j))
				keyVec := dataVec ^ runtimex.ReadUnaligned64(unsafe.Pointer(uintptr(k)+8*j))
				xacc[j^1] += dataVec
				xacc[j] += (keyVec & 0xffffffff) * (keyVec >> 32)
			}
		}
	}
}

func mix(a, b uint64) uint64 {
	hi, lo := bits.Mul64(a, b)
	return hi ^ lo
}
func xxh3RRMXMX(h64 uint64, length uint64) uint64 {
	h64 ^= bits.RotateLeft64(h64, 49) ^ bits.RotateLeft64(h64, 24)
	h64 *= 0x9fb21c651e98df25
	h64 ^= (h64 >> 35) + length
	h64 *= 0x9fb21c651e98df25
	h64 ^= (h64 >> 28)
	return h64
}

func xxh64Avalanche(h64 uint64) uint64 {
	h64 ^= h64 >> 33
	h64 *= prime64_2
	h64 ^= h64 >> 29
	h64 *= prime64_3
	h64 ^= h64 >> 32
	return h64
}

func xxh3Avalanche(x uint64) uint64 {
	x ^= x >> 37
	x *= 0x165667919e3779f9
	x ^= x >> 32
	return x
}