// ppc64x/power8:"NEG","SUBC","ANDN","POPCNTD"
	// ppc64x/power9:"SUBC","CNTTZD"
	return bits.TrailingZeros64(1 - n)
}

func TrailingZeros32(n uint32) int {
	// amd64/v1,amd64/v2:"BTSQ\\t\\$32","BSFQ"
	// amd64/v3:"TZCNTL"
	// 386:"BSFL"
	// arm:"CLZ"
	// arm64:"RBITW","CLZW"
	// s390x:"FLOGR","MOVWZ"
	// ppc64x/power8:"ANDN","POPCNTW"
	// ppc64x/power9: "CNTTZW"
	// wasm:"I64Ctz"

	a[3+i] = v&2 != 0
}

func bitOps(p *[12]uint64) {
	// amd64: `ORQ\t\$8, \(AX\)`
	p[0] |= 8
	// amd64: `ORQ\t\$1073741824, 8\(AX\)`
	p[1] |= 1 << 30
	// amd64: `BTSQ\t\$31, 16\(AX\)`
	p[2] |= 1 << 31
	// amd64: `BTSQ\t\$63, 24\(AX\)`
	p[3] |= 1 << 63

	// amd64: `ANDQ\t\$-9, 32\(AX\)`
	p[4] &^= 8
	// amd64: `ANDQ\t\$-1073741825, 40\(AX\)`
	p[5] &^= 1 << 30
	// amd64: `BTRQ\t\$31, 48\(AX\)`