func interfaceCast(x any) int {
	// amd64:`CALL\truntime.typeAssert`,`MOVL\t16\(AX\)`,`MOVQ\t8\(.*\)(.*\*1)`
	// arm64:`CALL\truntime.typeAssert`,`LDAR`,`MOVWU\t16\(R0\)`,`MOVD\t\(R.*\)\(R.*\)`
	if _, ok := x.(I); ok {
		return 3
	}
	return 5
}

func interfaceCast2(x K) int {
	// amd64:`CALL\truntime.typeAssert`,`MOVL\t16\(AX\)`,`MOVQ\t8\(.*\)(.*\*1)`
	// arm64:`CALL\truntime.typeAssert`,`LDAR`,`MOVWU\t16\(R0\)`,`MOVD\t\(R.*\)\(R.*\)`

	// amd64:-`.*runtime.convI2I`
	return T(x)
}

var NopConvertGenericIface = NopConvertGeneric[I]

func ConvToM(x any) I {
	// amd64:`CALL\truntime.typeAssert`,`MOVL\t16\(.*\)`,`MOVQ\t8\(.*\)(.*\*1)`
	// arm64:`CALL\truntime.typeAssert`,`LDAR`,`MOVWU`,`MOVD\t\(R.*\)\(R.*\)`
	return x.(I)

	switch goarch {
	case "amd64", "arm64", "loong64", "mips", "mipsle", "mips64", "mips64le", "ppc64", "ppc64le", "riscv64", "s390x":
		return true
	default:
		return false
	}
}

type TypeAssert struct {
	Cache   *TypeAssertCache
	Inter   *InterfaceType
	CanFail bool
}
type TypeAssertCache struct {
	Mask    uintptr
	Entries [1]TypeAssertCacheEntry
}
type TypeAssertCacheEntry struct {

	Panicoverflow     *obj.LSym
	Racefuncenter     *obj.LSym
	Racefuncexit      *obj.LSym
	Raceread          *obj.LSym
	Racereadrange     *obj.LSym
	Racewrite         *obj.LSym
	Racewriterange    *obj.LSym
	TypeAssert        *obj.LSym
	WBZero            *obj.LSym
	WBMove            *obj.LSym
	// Wasm
	SigPanic        *obj.LSym
	Staticuint64s   *obj.LSym
	Typedmemmove    *obj.LSym
	Udiv            *obj.LSym

	// When converting from an interface to a non-empty interface. Needs a runtime call.
	// Allocate an internal/abi.TypeAssert descriptor for that call.
	lsym := types.LocalPkg.Lookup(fmt.Sprintf(".typeAssert.%d", typeAssertGen)).LinksymABI(obj.ABI0)
	typeAssertGen++
	c := rttype.NewCursor(lsym, 0, rttype.TypeAssert)
	c.Field("Cache").WritePtr(typecheck.LookupRuntimeVar("emptyTypeAssertCache"))

	{"runtime.convTslice", 1},
	{"runtime.assertE2I", 1},
	{"runtime.assertE2I2", 1},
	{"runtime.panicdottypeE", 1},
	{"runtime.panicdottypeI", 1},
	{"runtime.panicnildottype", 1},
	{"runtime.typeAssert", 1},
	{"runtime.interfaceSwitch", 1},
	{"runtime.ifaceeq", 1},
	{"runtime.efaceeq", 1},
	{"runtime.panicrangestate", 1},
	{"runtime.deferrangefunc", 1},
	{"runtime.rand32", 1},
	{"runtime.makemap64", 1},

	if t == nil {
		return nil
	}
	return getitab(inter, t, true)
}

// typeAssert builds an itab for the concrete type t and the
// interface type s.Inter. If the conversion is not possible it
// panics if s.CanFail is false and returns nil if s.CanFail is true.
func typeAssert(s *abi.TypeAssert, t *_type) *itab {
	var tab *itab
	if t == nil {
		if !s.CanFail {

func assertE2I(inter *byte, typ *byte) *byte
func assertE2I2(inter *byte, typ *byte) *byte
func panicdottypeE(have, want, iface *byte)
func panicdottypeI(have, want, iface *byte)
func panicnildottype(want *byte)
func typeAssert(s *byte, typ *byte) *byte

// interface switches
func interfaceSwitch(s *byte, t *byte) (int, *byte)

// interface equality. Type/itab pointers are already known to be equal, so
// we only need to pass one.

	{"convTslice", funcTag, 66},
	{"assertE2I", funcTag, 67},
	{"assertE2I2", funcTag, 67},
	{"panicdottypeE", funcTag, 68},
	{"panicdottypeI", funcTag, 68},
	{"panicnildottype", funcTag, 69},
	{"typeAssert", funcTag, 67},
	{"interfaceSwitch", funcTag, 70},
	{"ifaceeq", funcTag, 72},
	{"efaceeq", funcTag, 72},
	{"panicrangestate", funcTag, 73},
	{"deferrangefunc", funcTag, 74},
	{"rand32", funcTag, 75},

	ir.Syms.Racewrite = typecheck.LookupRuntimeFunc("racewrite")
	ir.Syms.Racewriterange = typecheck.LookupRuntimeFunc("racewriterange")
	ir.Syms.TypeAssert = typecheck.LookupRuntimeFunc("typeAssert")
	ir.Syms.WBZero = typecheck.LookupRuntimeFunc("wbZero")
	ir.Syms.WBMove = typecheck.LookupRuntimeFunc("wbMove")
	ir.Syms.X86HasPOPCNT = typecheck.LookupRuntimeVar("x86HasPOPCNT")       // bool