}

// newAllocBits returns a pointer to 8 byte aligned bytes
// to be used for this span's alloc bits.
// newAllocBits is used to provide newly initialized spans
// allocation bits. For spans not being initialized the
// mark bits are repurposed as allocation bits when
// the span is swept.
func newAllocBits(nelems uintptr) *gcBits {
	return newMarkBits(nelems)
}

		obj, span, objIndex := findObject(ptr, 0, 0)
		if obj == 0 {
			continue
		}
		// TODO: Consider making two passes where the first
		// just prefetches the mark bits.
		mbits := span.markBitsForIndex(objIndex)
		if mbits.isMarked() {
			continue
		}
		mbits.setMarked()

		// Mark span.
		arena, pageIdx, pageMask := pageIndexOf(span.base())
		if arena.pageMarks[pageIdx]&pageMask == 0 {

	// That is, we can throw away all but the bottom logM-1 bits of y.
	// Instead of allocating a new y, we start reading y at the right word
	// and truncate it appropriately at the start of the loop.
	i := len(y) - 1
	mtop := int((logM - 2) / _W) // -2 because the top word of N bits is the (N-1)/W'th word.
	mmask := ^Word(0)
	if mbits := (logM - 1) & (_W - 1); mbits != 0 {
		mmask = (1 << mbits) - 1
	}
	if i > mtop {
		i = mtop

	// base and extent.
	b := b0
	n := n0

	for i := uintptr(0); i < n; {
		// Find bits for the next word.
		bits := uint32(*addb(ptrmask, i/(goarch.PtrSize*8)))
		if bits == 0 {
			i += goarch.PtrSize * 8
			continue
		}
		for j := 0; j < 8 && i < n; j++ {
			if bits&1 != 0 {
				// Same work as in scanobject; see comments there.
				p := *(*uintptr)(unsafe.Pointer(b + i))

	var x72 uint64
	x72, x71 = bits.Mul64(x1, arg2[4])
	var x73 uint64
	var x74 uint64
	x74, x73 = bits.Mul64(x1, arg2[3])
	var x75 uint64
	var x76 uint64
	x76, x75 = bits.Mul64(x1, arg2[2])
	var x77 uint64
	var x78 uint64
	x78, x77 = bits.Mul64(x1, arg2[1])
	var x79 uint64
	var x80 uint64
	x80, x79 = bits.Mul64(x1, arg2[0])
	var x81 uint64
	var x82 uint64
	x81, x82 = bits.Add64(x80, x77, uint64(0x0))

	var x39 uint64
	var x40 uint64
	x39, x40 = bits.Add64(x17, x30, uint64(p224Uint1(x38)))
	var x41 uint64
	var x42 uint64
	x41, x42 = bits.Add64(x19, x32, uint64(p224Uint1(x40)))
	var x43 uint64
	var x44 uint64
	x44, x43 = bits.Mul64(x1, arg2[3])
	var x45 uint64
	var x46 uint64
	x46, x45 = bits.Mul64(x1, arg2[2])
	var x47 uint64
	var x48 uint64

	x105, x104 = bits.Mul64(x1, arg2[6])
	var x106 uint64
	var x107 uint64
	x107, x106 = bits.Mul64(x1, arg2[5])
	var x108 uint64
	var x109 uint64
	x109, x108 = bits.Mul64(x1, arg2[4])
	var x110 uint64
	var x111 uint64
	x111, x110 = bits.Mul64(x1, arg2[3])
	var x112 uint64
	var x113 uint64
	x113, x112 = bits.Mul64(x1, arg2[2])
	var x114 uint64
	var x115 uint64
	x115, x114 = bits.Mul64(x1, arg2[1])

			name: "RotateLeft",
			in:   15,
			out:  [4]any{bits.RotateLeft8(15, 2), bits.RotateLeft16(15, 2), bits.RotateLeft32(15, 2), bits.RotateLeft64(15, 2)},
			out2: [4]any{bits.RotateLeft8(15, -2), bits.RotateLeft16(15, -2), bits.RotateLeft32(15, -2), bits.RotateLeft64(15, -2)},
		},
		{
			name: "Reverse",
			in:   19,
			out:  [4]any{bits.Reverse8(19), bits.Reverse16(19), bits.Reverse32(19), bits.Reverse64(19)},
		},
		{
			name: "ReverseBytes",

	x37, x38 = bits.Add64(x19, x21, uint64(p256Uint1(x36)))
	var x39 uint64
	var x40 uint64
	x40, x39 = bits.Mul64(x1, arg2[3])
	var x41 uint64
	var x42 uint64
	x42, x41 = bits.Mul64(x1, arg2[2])
	var x43 uint64
	var x44 uint64
	x44, x43 = bits.Mul64(x1, arg2[1])
	var x45 uint64
	var x46 uint64
	x46, x45 = bits.Mul64(x1, arg2[0])
	var x47 uint64
	var x48 uint64
	x47, x48 = bits.Add64(x46, x43, uint64(0x0))

		bc4 = bits.RotateLeft64(t, 18)
		t = a[1] ^ d1
		bc0 = bits.RotateLeft64(t, 1)
		t = a[7] ^ d2
		bc1 = bits.RotateLeft64(t, 6)
		t = a[13] ^ d3
		bc2 = bits.RotateLeft64(t, 25)
		t = a[19] ^ d4
		bc3 = bits.RotateLeft64(t, 8)
		a[20] = bc0 ^ (bc2 &^ bc1)
		a[1] = bc1 ^ (bc3 &^ bc2)
		a[7] = bc2 ^ (bc4 &^ bc3)
		a[13] = bc3 ^ (bc0 &^ bc4)
		a[19] = bc4 ^ (bc1 &^ bc0)

		t = a[5] ^ d0