} else if nbits == 32 {
		mb = bits.LeadingZeros32(uint32(mask))
		me = 32 - bits.TrailingZeros32(uint32(mask))
		mbn = bits.LeadingZeros32(^uint32(mask))
		men = 32 - bits.TrailingZeros32(^uint32(mask))
	} else {
		mb = bits.LeadingZeros64(uint64(mask))
		me = 64 - bits.TrailingZeros64(uint64(mask))
		mbn = bits.LeadingZeros64(^uint64(mask))
		men = 64 - bits.TrailingZeros64(^uint64(mask))
	}

	ACPOPW & obj.AMask: rIIEncoding,
	ACTZ & obj.AMask:   rIIEncoding,
	ACTZW & obj.AMask:  rIIEncoding,
	AMAX & obj.AMask:   rIIIEncoding,
	AMAXU & obj.AMask:  rIIIEncoding,
	AMIN & obj.AMask:   rIIIEncoding,
	AMINU & obj.AMask:  rIIIEncoding,
	AORN & obj.AMask:   rIIIEncoding,
	ASEXTB & obj.AMask: rIIEncoding,
	ASEXTH & obj.AMask: rIIEncoding,
	AXNOR & obj.AMask:  rIIIEncoding,

		i      int32
		after  int32
	}
	x.before = magic32
	x.after = magic32
	x.i = -1
	j := x.i
	for mask := int32(1); mask != 0; mask <<= 1 {
		old := x.i
		k := AndInt32(&x.i, ^mask)
		j &= ^mask
		if x.i != j || k != old {
			t.Fatalf("mask=%d i=%d j=%d k=%d old=%d", mask, x.i, j, k, old)
		}
	}
	if x.before != magic32 || x.after != magic32 {

	// the address of the first word referenced by mask.
	addr uintptr

	// mask is a bitmask where each bit corresponds to pointer-words after addr.
	// Bit 0 is the pointer-word at addr, Bit 1 is the next word, and so on.
	// If a bit is 1, then there is a pointer at that word.
	// nextFast and next mask out bits in this mask as their pointers are processed.
	mask uintptr

}

// allocReg chooses a register from the set of registers in mask.
// If there is no unused register, a Value will be kicked out of
// a register to make room.
func (s *regAllocState) allocReg(mask regMask, v *Value) register {
	if v.OnWasmStack {
		return noRegister
	}

	mask &= s.allocatable
	mask &^= s.nospill
	if mask == 0 {
		s.f.Fatalf("no register available for %s", v.LongString())
	}

//sys	fanotifyMark(fd int, flags uint, mask uint64, dirFd int, pathname *byte) (err error)

func FanotifyMark(fd int, flags uint, mask uint64, dirFd int, pathname string) (err error) {
	if pathname == "" {
		return fanotifyMark(fd, flags, mask, dirFd, nil)
	}
	p, err := BytePtrFromString(pathname)
	if err != nil {
		return err
	}
	return fanotifyMark(fd, flags, mask, dirFd, p)
}

	if esize > datasize {
		return nil
	}
	welem = 1<<(s+1) - 1
	ror := (welem >> r) | (welem << (esize - r))
	ror &= ((1 << esize) - 1)
	wmask = 0
	for i = 0; i < datasize; i += esize {
		wmask = (wmask << esize) | ror
	}
	return Imm64{wmask, false}

	}

	// Element is small with pointer mask; use as literal bits.
	ptrs := typ.PtrBytes / goarch.PtrSize
	mask := typ.GcSlice(0, (ptrs+7)/8)

	// Emit 120-bit chunks of full bytes (max is 127 but we avoid using partial bytes).
	for ; ptrs > 120; ptrs -= 120 {
		dst = append(dst, 120)
		dst = append(dst, mask[:15]...)
		mask = mask[15:]
	}

	dst = append(dst, byte(ptrs))

	}

	pattern := event.NewPattern(prefix, suffix)

	var eventNames []event.Name
	var mask pubsub.Mask
	for _, ev := range values[peerRESTListenEvents] {
		eventName, err := event.ParseName(ev)
		if err != nil {
			return grid.NewRemoteErr(err)
		}
		mask.MergeMaskable(eventName)
		eventNames = append(eventNames, eventName)
	}

		k, d := it.Next()
		live := d.(*liveSlot)
		slots[k] = live.VarLoc
		if live.VarLoc.Registers == 0 {
			continue
		}

		mask := uint64(live.VarLoc.Registers)
		for {
			if mask == 0 {
				break
			}
			reg := uint8(bits.TrailingZeros64(mask))
			mask &^= 1 << reg

			registers[reg] = append(registers[reg], SlotID(k))
		}
	}
	state.slots, state.registers = slots, registers
}