isChan(Chan(nil))

	asFloat(f)
	isFloat(f)
	asFloat(-f)
	isFloat(-f)
	asFloat(+f)
	isFloat(+f)
	asFloat(f + 1)
	isFloat(f + 1)
	asFloat(1 + f)
	isFloat(1 + f)
	asFloat(f + f)
	isFloat(f + f)
	f++
	f += 2
	asFloat(f - 1)
	isFloat(f - 1)
	asFloat(1 - f)
	isFloat(1 - f)
	asFloat(f - f)
	isFloat(f - f)
	f--
	f -= 2
	asFloat(f * 2.5)
	isFloat(f * 2.5)

type BasicInfo int

// Properties of basic types.
const (
	IsBoolean BasicInfo = 1 << iota
	IsInteger
	IsUnsigned
	IsFloat
	IsComplex
	IsString
	IsUntyped

	IsOrdered   = IsInteger | IsFloat | IsString
	IsNumeric   = IsInteger | IsFloat | IsComplex
	IsConstType = IsBoolean | IsNumeric | IsString
)

// A Basic represents a basic type.
type Basic struct {
	kind BasicKind

type BasicInfo int

// Properties of basic types.
const (
	IsBoolean BasicInfo = 1 << iota
	IsInteger
	IsUnsigned
	IsFloat
	IsComplex
	IsString
	IsUntyped

	IsOrdered   = IsInteger | IsFloat | IsString
	IsNumeric   = IsInteger | IsFloat | IsComplex
	IsConstType = IsBoolean | IsNumeric | IsString
)

// A Basic represents a basic type.
type Basic struct {
	kind BasicKind

	"cmd/compile/internal/types"
	"math"
)

func softfloat(f *Func) {
	if !f.Config.SoftFloat {
		return
	}
	newInt64 := false

	for _, b := range f.Blocks {
		for _, v := range b.Values {
			if v.Type.IsFloat() {
				f.unCache(v)
				switch v.Op {
				case OpPhi, OpLoad, OpArg:
					if v.Type.Size() == 4 {
						v.Type = f.Config.Types.UInt32
					} else {
						v.Type = f.Config.Types.UInt64
					}

func NewZero(pos src.XPos, typ *types.Type) Node {
	switch {
	case typ.HasNil():
		return NewNilExpr(pos, typ)
	case typ.IsInteger():
		return NewBasicLit(pos, typ, intZero)
	case typ.IsFloat():
		return NewBasicLit(pos, typ, floatZero)
	case typ.IsComplex():
		return NewBasicLit(pos, typ, complexZero)
	case typ.IsBoolean():
		return NewBasicLit(pos, typ, constant.MakeBool(false))
	case typ.IsString():

			}
		}
	}
	if !n.IsInt && !n.IsUint && !n.IsFloat {
		return nil, fmt.Errorf("illegal number syntax: %q", text)
	}
	return n, nil
}

// simplifyComplex pulls out any other types that are represented by the complex number.
// These all require that the imaginary part be zero.
func (n *NumberNode) simplifyComplex() {
	n.IsFloat = imag(n.Complex128) == 0
	if n.IsFloat {
		n.Float64 = real(n.Complex128)

	SimType[TFUNC] = TPTR
	SimType[TUNSAFEPTR] = TPTR

	for et := TINT8; et <= TUINT64; et++ {
		IsInt[et] = true
	}
	IsInt[TINT] = true
	IsInt[TUINT] = true
	IsInt[TUINTPTR] = true

	IsFloat[TFLOAT32] = true
	IsFloat[TFLOAT64] = true

	IsComplex[TCOMPLEX64] = true
	IsComplex[TCOMPLEX128] = true
}

func makeErrorInterface() *Type {
	sig := NewSignature(FakeRecv(), nil, []*Field{

	Uint32:        {Uint32, IsInteger | IsUnsigned, "uint32"},
	Uint64:        {Uint64, IsInteger | IsUnsigned, "uint64"},
	Uintptr:       {Uintptr, IsInteger | IsUnsigned, "uintptr"},
	Float32:       {Float32, IsFloat, "float32"},
	Float64:       {Float64, IsFloat, "float64"},
	Complex64:     {Complex64, IsComplex, "complex64"},
	Complex128:    {Complex128, IsComplex, "complex128"},
	String:        {String, IsString, "string"},

	Uint32:        {Uint32, IsInteger | IsUnsigned, "uint32"},
	Uint64:        {Uint64, IsInteger | IsUnsigned, "uint64"},
	Uintptr:       {Uintptr, IsInteger | IsUnsigned, "uintptr"},
	Float32:       {Float32, IsFloat, "float32"},
	Float64:       {Float64, IsFloat, "float64"},
	Complex64:     {Complex64, IsComplex, "complex64"},
	Complex128:    {Complex128, IsComplex, "complex128"},
	String:        {String, IsString, "string"},

	case sys.ARM, sys.MIPS:
		if src.IsFloat() {
			switch dst.Kind() {
			case types.TINT64, types.TUINT64:
				return types.TFLOAT64, dst.Kind()
			}
		}
		if dst.IsFloat() {
			switch src.Kind() {
			case types.TINT64, types.TUINT64:
				return src.Kind(), dst.Kind()
			}
		}

	case sys.I386:
		if src.IsFloat() {
			switch dst.Kind() {
			case types.TINT64, types.TUINT64: