f.Cache.scrPoset = append(f.Cache.scrPoset, po)
}

func (f *Func) localSlotAddr(slot LocalSlot) *LocalSlot {
	a, ok := f.CanonicalLocalSlots[slot]
	if !ok {
		a = new(LocalSlot)
		*a = slot // don't escape slot
		f.CanonicalLocalSlots[slot] = a
	}
	return a
}

func (f *Func) SplitString(name *LocalSlot) (*LocalSlot, *LocalSlot) {
	ptrType := types.NewPtr(types.Types[types.TUINT8])
	lenType := types.Types[types.TINT]

			// the spill location.
			var name LocalSlot
			if v.Op == OpStoreReg {
				name = names[v.Args[0].ID]
			} else {
				name = names[v.ID]
			}
			if name.N != nil && v.Type.Compare(name.Type) == types.CMPeq {
				for _, id := range s.interfere[v.ID] {
					h := f.getHome(id)
					if h != nil && h.(LocalSlot).N == name.N && h.(LocalSlot).Off == name.Off {
						// A variable can interfere with itself.

	t    testing.TB
	ctxt *obj.Link
	f    *ir.Func
}

func (TestFrontend) StringData(s string) *obj.LSym {
	return nil
}
func (d TestFrontend) SplitSlot(parent *LocalSlot, suffix string, offset int64, t *types.Type) LocalSlot {
	return LocalSlot{N: parent.N, Type: t, Off: offset}
}
func (d TestFrontend) Syslook(s string) *obj.LSym {
	return d.ctxt.Lookup(s)
}
func (TestFrontend) UseWriteBarrier() bool {

	slmap  map[slotKey]SlKeyIdx
	slkeys []LocalSlot
}

func newSlotCanonicalizer() *slotCanonicalizer {
	return &slotCanonicalizer{
		slmap:  make(map[slotKey]SlKeyIdx),
		slkeys: []LocalSlot{LocalSlot{N: nil}},
	}
}

type SlKeyIdx uint32

const noSlot = SlKeyIdx(0)

// slotKey is a type-insensitive encapsulation of a LocalSlot; it
// is used to key a map within slotCanonicalizer.

		fn.LSym.R[i].Type |= objabi.R_WEAK
	}
}

// StackOffset returns the stack location of a LocalSlot relative to the
// stack pointer, suitable for use in a DWARF location entry. This has nothing
// to do with its offset in the user variable.
func StackOffset(slot ssa.LocalSlot) int32 {
	n := slot.N
	var off int64
	switch n.Class {
	case ir.PPARAM, ir.PPARAMOUT:
		if !n.IsOutputParamInRegisters() {

	StringData(string) *obj.LSym

	// Given the name for a compound type, returns the name we should use
	// for the parts of that compound type.
	SplitSlot(parent *LocalSlot, suffix string, offset int64, t *types.Type) LocalSlot

	// Syslook returns a symbol of the runtime function/variable with the
	// given name.
	Syslook(string) *obj.LSym

	// UseWriteBarrier reports whether write barrier is enabled

}

// AutoVar returns a *Name and int64 representing the auto variable and offset within it
// where v should be spilled.
func AutoVar(v *Value) (*ir.Name, int64) {
	if loc, ok := v.Block.Func.RegAlloc[v.ID].(LocalSlot); ok {
		if v.Type.Size() > loc.Type.Size() {
			v.Fatalf("spill/restore type %s doesn't fit in slot type %s", v.Type, loc.Type)
		}
		return loc.N, loc.Off
	}

func (e *ssafn) SplitSlot(parent *ssa.LocalSlot, suffix string, offset int64, t *types.Type) ssa.LocalSlot {
	node := parent.N

	if node.Class != ir.PAUTO || node.Addrtaken() {
		// addressed things and non-autos retain their parents (i.e., cannot truly be split)
		return ssa.LocalSlot{N: node, Type: t, Off: parent.Off + offset}
	}