// 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"

		// 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 {

	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 {

		{"RotateLeft64", Func, 9},
		{"RotateLeft8", Func, 9},
		{"Sub", Func, 12},
		{"Sub32", Func, 12},
		{"Sub64", Func, 12},
		{"TrailingZeros", Func, 9},
		{"TrailingZeros16", Func, 9},
		{"TrailingZeros32", Func, 9},
		{"TrailingZeros64", Func, 9},
		{"TrailingZeros8", Func, 9},
		{"UintSize", Const, 9},
	},
	"math/cmplx": {
		{"Abs", Func, 0},
		{"Acos", Func, 0},
		{"Acosh", Func, 0},

			}
		}
		b := *(addb(bv.bytedata, i/8))
		for b != 0 {
			j := uintptr(sys.TrailingZeros8(b))
			b &= b - 1
			pp := (*uintptr)(add(scanp, (i+j)*goarch.PtrSize))
		retry:
			p := *pp
			if f.valid() && 0 < p && p < minLegalPointer && debug.invalidptr != 0 {

		},
		sys.MIPS)
	addF("math/bits", "TrailingZeros8",
		func(s *state, n *ir.CallExpr, args []*ssa.Value) *ssa.Value {
			return s.newValue1(ssa.OpCtz8, types.Types[types.TINT], args[0])
		},
		sys.AMD64, sys.I386, sys.ARM, sys.ARM64, sys.Wasm)
	addF("math/bits", "TrailingZeros8",
		func(s *state, n *ir.CallExpr, args []*ssa.Value) *ssa.Value {

func ntz32(x int32) int { return bits.TrailingZeros32(uint32(x)) }
func ntz16(x int16) int { return bits.TrailingZeros16(uint16(x)) }
func ntz8(x int8) int   { return bits.TrailingZeros8(uint8(x)) }

func oneBit(x int64) bool   { return x&(x-1) == 0 && x != 0 }
func oneBit8(x int8) bool   { return x&(x-1) == 0 && x != 0 }
func oneBit16(x int16) bool { return x&(x-1) == 0 && x != 0 }