main.go

// +build ignore

package main

import "fmt"

func main() {

	// 9 + 9 + 9 + 9 + 9 + 9 + 10
	srcmask := uint64(0x007f800000000000)
	dstmask := srcmask >> 8
	shift := 8

	var what string

	// what = `	s.tables[t] = append(s.tables[t], entry{hash: p, docid: docid});  t++`
	what = `        ids = append(ids, findInTable(s.tables[t], p, mask3)...); t++`

	fmt.Println(`
    t := 0

    var p uint64

    for i := 0; i < 6; i++ {
	p = sig
	` + what)

	for i := 0; i < 5; i++ {
		fmt.Printf("	p = (sig & 0x%016x) | (sig & 0x%016x >> %d) | (sig & 0x%016x << %d)\n", ^(srcmask | dstmask), srcmask, shift, dstmask, shift)
		fmt.Println(what)

		dstmask >>= 8
		shift += 8
	}

	srcmask = 0x007f000000000000
	dstmask = 0x07f

	for i := 0; i < 1; i++ {

		fmt.Printf("	p = (sig & 0x%016x) | (sig & 0x%016x >> %d) | (sig & 0x%016x << %d)\n", ^(srcmask | dstmask), srcmask, shift, dstmask, shift)
		fmt.Println(what)
		fmt.Println(`	sig = (sig << 9) | (sig >> (64 - 9))`)
	}
	fmt.Println(`}`)

	// 8 + 8 + 8 + 8 + 8 + 7 + 7 has lower MSE than 8 + 8 + 8 + 8 + 8 + 8 + 6

	srcmask = 0x003fc00000000000
	dstmask = srcmask >> 8
	shift = 8
	fmt.Println(what)
	for i := 0; i < 4; i++ {
		fmt.Printf("	p = (sig & 0x%016x) | (sig & 0x%016x >> %d) | (sig & 0x%016x << %d)\n", ^(srcmask | dstmask), srcmask, shift, dstmask, shift)
		fmt.Println(what)
		dstmask >>= 8
		shift += 8
	}

	srcmask = 0x003f800000000000
	dstmask = 0x07f << 7
	shift = (64 - 10 - 7)
	for i := 0; i < 2; i++ {
		fmt.Printf("	p = (sig & 0x%016x) | (sig & 0x%016x >> %d) | (sig & 0x%016x << %d)\n", ^(srcmask | dstmask), srcmask, shift, dstmask, shift)
		fmt.Println(what)
		dstmask >>= 7
		shift += 7
	}
}