func mkmapnames(base string, ptr string) mapnames {
	return mapnames{base, base + "_fast32", base + "_fast32" + ptr, base + "_fast64", base + "_fast64" + ptr, base + "_faststr"}
}

var mapaccess1 = mkmapnames("mapaccess1", "")
var mapaccess2 = mkmapnames("mapaccess2", "")
var mapassign = mkmapnames("mapassign", "ptr")
var mapdelete = mkmapnames("mapdelete", "")

func mapfast(t *types.Type) int {
	if t.Elem().Size() > abi.MapMaxElemBytes {

	{"runtime.rand32", 1},
	{"runtime.makemap64", 1},
	{"runtime.makemap", 1},
	{"runtime.makemap_small", 1},
	{"runtime.mapaccess1", 1},
	{"runtime.mapaccess1_fast32", 1},
	{"runtime.mapaccess1_fast64", 1},
	{"runtime.mapaccess1_faststr", 1},
	{"runtime.mapaccess1_fat", 1},
	{"runtime.mapaccess2", 1},
	{"runtime.mapaccess2_fast32", 1},
	{"runtime.mapaccess2_fast64", 1},
	{"runtime.mapaccess2_faststr", 1},

	fast := mapfast(t)
	key := mapKeyArg(fast, r, r.Index, false)

	// from:
	//   a,b = m[i]
	// to:
	//   var,b = mapaccess2*(t, m, i)
	//   a = *var
	a := n.Lhs[0]

	var call *ir.CallExpr
	if w := t.Elem().Size(); w <= abi.ZeroValSize {
		fn := mapfn(mapaccess2[fast], t, false)
		call = mkcall1(fn, fn.Type().ResultsTuple(), init, reflectdata.IndexMapRType(base.Pos, r), r.X, key)
	} else {

		}
	}
	return unsafe.Pointer(&zeroVal[0])
}

// mapaccess2 should be an internal detail,
// but widely used packages access it using linkname.
// Notable members of the hall of shame include:
//   - github.com/ugorji/go/codec
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//
//go:linkname mapaccess2
func mapaccess2(t *maptype, h *hmap, key unsafe.Pointer) (unsafe.Pointer, bool) {

func mapaccess1_fat(mapType *byte, hmap map[any]any, key *any, zero *byte) (val *any)
func mapaccess2(mapType *byte, hmap map[any]any, key *any) (val *any, pres bool)
func mapaccess2_fast32(mapType *byte, hmap map[any]any, key uint32) (val *any, pres bool)
func mapaccess2_fast64(mapType *byte, hmap map[any]any, key uint64) (val *any, pres bool)

	{"rand32", funcTag, 75},
	{"makemap64", funcTag, 77},
	{"makemap", funcTag, 78},
	{"makemap_small", funcTag, 79},
	{"mapaccess1", funcTag, 80},
	{"mapaccess1_fast32", funcTag, 81},
	{"mapaccess1_fast64", funcTag, 82},
	{"mapaccess1_faststr", funcTag, 83},
	{"mapaccess1_fat", funcTag, 84},
	{"mapaccess2", funcTag, 85},
	{"mapaccess2_fast32", funcTag, 86},
	{"mapaccess2_fast64", funcTag, 87},
	{"mapaccess2_faststr", funcTag, 88},

		args = append(args, reflectdata.ZeroAddr(t.Elem().Size()))
		mapFn = mapfn("mapaccess1_fat", t, true)
	default:
		mapFn = mapfn(mapaccess1[fast], t, false)
	}
	call := mkcall1(mapFn, nil, init, args...)
	call.SetType(types.NewPtr(t.Elem()))
	call.MarkNonNil() // mapaccess1* and mapassign always return non-nil pointers.
	star := ir.NewStarExpr(base.Pos, call)
	star.SetType(t.Elem())
	star.SetTypecheck(1)
	return star

	} else {
		key = key.assignTo("reflect.Value.MapIndex", tt.Key, nil)
		var k unsafe.Pointer
		if key.flag&flagIndir != 0 {
			k = key.ptr
		} else {
			k = unsafe.Pointer(&key.ptr)
		}
		e = mapaccess(v.typ(), v.pointer(), k)
	}
	if e == nil {
		return Value{}
	}
	typ := tt.Elem
	fl := (v.flag | key.flag).ro()
	fl |= flag(typ.Kind())
	return copyVal(typ, fl, e)
}