}
	return res
}

// Value decodes and returns a constant.Value from the element
// bitstream.
func (r *Decoder) Value() constant.Value {
	r.Sync(SyncValue)
	isComplex := r.Bool()
	val := r.scalar()
	if isComplex {
		val = constant.BinaryOp(val, token.ADD, constant.MakeImag(r.scalar()))
	}
	return val
}

func (r *Decoder) scalar() constant.Value {

func isInteger(t Type) bool        { return isBasic(t, IsInteger) }
func isUnsigned(t Type) bool       { return isBasic(t, IsUnsigned) }
func isFloat(t Type) bool          { return isBasic(t, IsFloat) }
func isComplex(t Type) bool        { return isBasic(t, IsComplex) }
func isNumeric(t Type) bool        { return isBasic(t, IsNumeric) }
func isString(t Type) bool         { return isBasic(t, IsString) }

	}
	a := s.Sizeof(T) // may be 0 or negative
	// spec: "For a variable x of any type: unsafe.Alignof(x) is at least 1."
	if a < 1 {
		return 1
	}
	// complex{64,128} are aligned like [2]float{32,64}.
	if isComplex(T) {
		a /= 2
	}
	if a > s.MaxAlign {
		return s.MaxAlign
	}
	return a
}

func IsSyncAtomicAlign64(T Type) bool {
	named := asNamed(T)
	if named == nil {
		return false
	}

			}
			r := roundFloat64(x)
			if r != nil {
				*rounded = r
				return true
			}
		case UntypedFloat:
			return true
		default:
			panic("unreachable")
		}

	case isComplex(typ):
		x := constant.ToComplex(x)
		if x.Kind() != constant.Complex {
			return false
		}
		switch typ.kind {
		case Complex64:
			if rounded == nil {

	// When instrumenting, any expression might require function calls.
	if base.Flag.Cfg.Instrumenting {
		return true
	}

	isSoftFloat := func(typ *types.Type) bool {
		return types.IsFloat[typ.Kind()] || types.IsComplex[typ.Kind()]
	}

	return ir.Any(n, func(n ir.Node) bool {
		// walk should have already moved any Init blocks off of
		// expressions.
		if len(n.Init()) != 0 {
			base.FatalfAt(n.Pos(), "mayCall %+v", n)

	}
	a := s.Sizeof(T) // may be 0 or negative
	// spec: "For a variable x of any type: unsafe.Alignof(x) is at least 1."
	if a < 1 {
		return 1
	}
	// complex{64,128} are aligned like [2]float{32,64}.
	if isComplex(T) {
		a /= 2
	}
	if a > s.MaxAlign {
		return s.MaxAlign
	}
	return a
}

func _IsSyncAtomicAlign64(T Type) bool {
	named := asNamed(T)
	if named == nil {
		return false
	}

		val = constant.MakeString(r.string())

	case types.IsInteger:
		var x big.Int
		r.mpint(&x, b)
		val = constant.Make(&x)

	case types.IsFloat:
		val = r.mpfloat(b)

	case types.IsComplex:
		re := r.mpfloat(b)
		im := r.mpfloat(b)
		val = constant.BinaryOp(re, token.ADD, constant.MakeImag(im))

	default:
		errorf("unexpected type %v", typ) // panics
		panic("unreachable")
	}

	// and we have no context.  (If it was a method argument,
	// we'd know what we need.) The syntax guides us to some extent.
	s.at(constant)
	switch {
	case constant.IsComplex:
		return reflect.ValueOf(constant.Complex128) // incontrovertible.

	case constant.IsFloat &&
		!isHexInt(constant.Text) && !isRuneInt(constant.Text) &&
		strings.ContainsAny(constant.Text, ".eEpP"):

			case 48:
				op = ssa.OpZeroExt32to64
			default:
				s.Fatalf("weird integer sign extension %v -> %v", ft, tt)
			}
		}
		return s.newValue1(op, tt, v)
	}

	if ft.IsComplex() && tt.IsComplex() {
		var op ssa.Op
		if ft.Size() == tt.Size() {
			switch ft.Size() {
			case 8:
				op = ssa.OpRound32F
			case 16:
				op = ssa.OpRound64F
			default:

pkg go/types, const Int8 BasicKind
pkg go/types, const Invalid = 0
pkg go/types, const Invalid BasicKind
pkg go/types, const IsBoolean = 1
pkg go/types, const IsBoolean BasicInfo
pkg go/types, const IsComplex = 16
pkg go/types, const IsComplex BasicInfo
pkg go/types, const IsConstType = 59
pkg go/types, const IsConstType BasicInfo
pkg go/types, const IsFloat = 8
pkg go/types, const IsFloat BasicInfo
pkg go/types, const IsInteger = 2