}{
		{
			name: "LeadingZeros",
			in:   1,
			out:  [4]any{bits.LeadingZeros8(1), bits.LeadingZeros16(1), bits.LeadingZeros32(1), bits.LeadingZeros64(1)},
		},
		{
			name: "TrailingZeros",
			in:   14,
			out:  [4]any{bits.TrailingZeros8(14), bits.TrailingZeros16(14), bits.TrailingZeros32(14), bits.TrailingZeros64(14)},
		},
		{
			name: "OnesCount",
			in:   14,

	// arm64:"RORW"
	// ppc64x:"ROTLW"
	// s390x:"RLL"
	// wasm:"I32Rotl"
	return bits.RotateLeft32(n, m)
}

// ------------------------ //
//    bits.TrailingZeros    //
// ------------------------ //

func TrailingZeros(n uint) int {
	// amd64/v1,amd64/v2:"BSFQ","MOVL\t\\$64","CMOVQEQ"
	// amd64/v3:"TZCNTQ"
	// 386:"BSFL"
	// arm:"CLZ"
	// arm64:"RBIT","CLZ"
	// s390x:"FLOGR"

				}
				if UintSize == 64 {
					got = TrailingZeros(uint(x))
					if got != want {
						t.Fatalf("TrailingZeros(%#016x) == %d; want %d", x, got, want)
					}
				}
			}
		}
	}
}

func BenchmarkTrailingZeros(b *testing.B) {
	var s int
	for i := 0; i < b.N; i++ {
		s += TrailingZeros(uint(Input) << (uint(i) % UintSize))
	}
	Output = s
}

}

// TrailingZeros returns the number of trailing zero bits in x; the result is [UintSize] for x == 0.
func TrailingZeros(x uint) int {
	if UintSize == 32 {
		return TrailingZeros32(uint32(x))
	}
	return TrailingZeros64(uint64(x))
}

// TrailingZeros8 returns the number of trailing zero bits in x; the result is 8 for x == 0.
func TrailingZeros8(x uint8) int {
	return int(ntz8tab[x])
}

		// less than 8 which is smaller than any register width. This allows
		// the compiler to generate better code for the shift operation.
		shift := uint(bits.TrailingZeros(uint(base))) & 7
		b := uint64(base)
		m := uint(base) - 1 // == 1<<shift - 1
		for u >= b {
			i--
			a[i] = digits[uint(u)&m]
			u >>= shift
		}
		// u < base
		i--
		a[i] = digits[uint(u)]

		spanSize := c.npages * pageSize
		objects := spanSize / c.size
		tailWaste := spanSize - c.size*(spanSize/c.size)
		maxWaste := float64((c.size-prevSize-1)*objects+tailWaste) / float64(spanSize)
		alignBits := bits.TrailingZeros(uint(c.size))
		if alignBits > pageShift {
			// object alignment is capped at page alignment
			alignBits = pageShift
		}
		for i := range minAligns {
			if i > alignBits {
				minAligns[i] = 0

func udivisibleOK32(c int32) bool { return udivisibleOK(32, int64(c)) }
func udivisibleOK64(c int64) bool { return udivisibleOK(64, c) }

type udivisibleData struct {
	k   int64  // trailingZeros(c)
	m   uint64 // m * (c>>k) mod 2^n == 1 multiplicative inverse of odd portion modulo 2^n
	max uint64 // ⎣(2^n - 1)/ c⎦ max value to for divisibility
}

func udivisible(n uint, c int64) udivisibleData {

pkg math/bits, func RotateLeft64(uint64, int) uint64
pkg math/bits, func RotateLeft8(uint8, int) uint8
pkg math/bits, func TrailingZeros(uint) int
pkg math/bits, func TrailingZeros16(uint16) int
pkg math/bits, func TrailingZeros32(uint32) int
pkg math/bits, func TrailingZeros64(uint64) int
pkg math/bits, func TrailingZeros8(uint8) int
pkg mime, var ErrInvalidMediaParameter error
pkg mime/multipart, type FileHeader struct, Size int64

	if neg {
		i++
	}
	s := make([]byte, i)

	// convert power of two and non power of two bases separately
	if b := Word(base); b == b&-b {
		// shift is base b digit size in bits
		shift := uint(bits.TrailingZeros(uint(b))) // shift > 0 because b >= 2
		mask := Word(1<<shift - 1)
		w := x[0]         // current word
		nbits := uint(_W) // number of unprocessed bits in w

	for x[i] == 0 {
		i++
	}
	// x[i] != 0
	return i*_W + uint(bits.TrailingZeros(uint(x[i])))
}

// isPow2 returns i, true when x == 2**i and 0, false otherwise.
func (x nat) isPow2() (uint, bool) {
	var i uint
	for x[i] == 0 {
		i++
	}
	if i == uint(len(x))-1 && x[i]&(x[i]-1) == 0 {
		return i*_W + uint(bits.TrailingZeros(uint(x[i]))), true
	}
	return 0, false
}

func same(x, y nat) bool {