return nil, ErrShortStat
	}
	size, buf := gbit16(b)
	if len(b) != int(size)+2 {
		return nil, ErrBadStat
	}
	b = buf

	var d Dir
	d.Type, b = gbit16(b)
	d.Dev, b = gbit32(b)
	d.Qid.Type, b = gbit8(b)
	d.Qid.Vers, b = gbit32(b)
	d.Qid.Path, b = gbit64(b)
	d.Mode, b = gbit32(b)
	d.Atime, b = gbit32(b)
	d.Mtime, b = gbit32(b)

	n, b := gbit64(b)
	d.Length = int64(n)

	var ok bool

		return nil, ErrShortStat
	}
	size, buf := gbit16(b)
	if len(b) != int(size)+2 {
		return nil, ErrBadStat
	}
	b = buf

	var d Dir
	d.Type, b = gbit16(b)
	d.Dev, b = gbit32(b)
	d.Qid.Type, b = gbit8(b)
	d.Qid.Vers, b = gbit32(b)
	d.Qid.Path, b = gbit64(b)
	d.Mode, b = gbit32(b)
	d.Atime, b = gbit32(b)
	d.Mtime, b = gbit32(b)

	n, b := gbit64(b)
	d.Length = int64(n)

	var ok bool

		return
	}
	entryLen, buf := gbit16(buf)
	if entryLen > len(buf) {
		return
	}
	n, b := gbit16(buf[nameOffset:])
	if n > len(b) {
		return
	}
	name = b[:n]
	rest = buf[entryLen:]
	return
}

// gbit16 reads a 16-bit little-endian binary number from b and returns it
// with the remaining slice of b.
//
//go:nosplit
func gbit16(b []byte) (int, []byte) {

}

// Init seeds the State with the given seed value.
func (s *State) Init(seed [32]byte) {
	s.Init64([4]uint64{
		byteorder.LeUint64(seed[0*8:]),
		byteorder.LeUint64(seed[1*8:]),
		byteorder.LeUint64(seed[2*8:]),
		byteorder.LeUint64(seed[3*8:]),
	})
}

// Init64 seeds the state with the given seed value.
func (s *State) Init64(seed [4]uint64) {
	s.seed = seed
	block(&s.seed, &s.buf, 0)
	s.c = 0
	s.i = 0
	s.n = chunk

	}
	if want, got = c64s-a, subr64s(a); got != want {
		panic(fmt.Sprintf("subr64s(%x) = %x, want %x", a, got, want))
	}
	if want, got = a&^c64a, bic64(a); got != want {
		panic(fmt.Sprintf("bic64(%x) = %x, want %x", a, got, want))
	}

			}
		}

		x64 := uint64(m)
		got64 := RotateLeft64(x64, int(k))
		want64 := x64<<(k&0x3f) | x64>>(64-k&0x3f)
		if got64 != want64 {
			t.Fatalf("RotateLeft64(%#016x, %d) == %#016x; want %#016x", x64, k, got64, want64)
		}
		got64 = RotateLeft64(want64, -int(k))
		if got64 != x64 {
			t.Fatalf("RotateLeft64(%#016x, -%d) == %#016x; want %#016x", want64, k, got64, x64)
		}
		if UintSize == 64 {
			x := uint(m)

			got, err := ParseComplex(test.in, 64)
			if !reflect.DeepEqual(err, test.err) {
				t.Fatalf("ParseComplex(%q, 64) = %v, %v; want %v, %v", test.in, got, err, test.out, test.err)
			}
			got64 := complex64(got)
			if complex128(got64) != test.out {
				t.Fatalf("ParseComplex(%q, 64) = %v, %v; want %v, %v", test.in, got, err, test.out, test.err)
			}
		}
	}
}

// It returns the string as a byte slice, or nil if b is too short to contain the length or
// the full string.
//
//go:nosplit
func gstringb(b []byte) []byte {
	if len(b) < 2 {
		return nil
	}
	n, b := gbit16(b)
	if int(n) > len(b) {
		return nil
	}
	return b[:n]
}

// Offset of the name field in a 9P directory entry - see UnmarshalDir() in dir_plan9.go
const nameOffset = 39

func mrandinit(mp *m) {
	var seed [4]uint64
	for i := range seed {
		seed[i] = bootstrapRand()
	}
	bootstrapRandReseed() // erase key we just extracted
	mp.chacha8.Init64(seed)
	mp.cheaprand = rand()
}

// randn is like rand() % n but faster.
// Do not change signature: used via linkname from other packages.
//
//go:nosplit
//go:linkname randn

	"uint16":     {Size: 2, Align: 2, C: c("GoUint16")},
	"int32":      {Size: 4, Align: 4, C: c("GoInt32")},
	"uint32":     {Size: 4, Align: 4, C: c("GoUint32")},
	"int64":      {Size: 8, Align: 8, C: c("GoInt64")},
	"uint64":     {Size: 8, Align: 8, C: c("GoUint64")},
	"float32":    {Size: 4, Align: 4, C: c("GoFloat32")},
	"float64":    {Size: 8, Align: 8, C: c("GoFloat64")},