// result of comparisons (untyped bool), intermediate
		// (delayed-checked) rhs operands of shifts, and as
		// the value nil.
		switch x.typ.(*Basic).kind {
		case UntypedBool:
			if !isBoolean(target) {
				return nil, nil, InvalidUntypedConversion
			}
		case UntypedInt, UntypedRune, UntypedFloat, UntypedComplex:
			if !isNumeric(target) {
				return nil, nil, InvalidUntypedConversion
			}

	return t.Elem().cmp(x.Elem())
}

// IsKind reports whether t is a Type of the specified kind.
func (t *Type) IsKind(et Kind) bool {
	return t != nil && t.kind == et
}

func (t *Type) IsBoolean() bool {
	return t.kind == TBOOL
}

var unsignedEType = [...]Kind{
	TINT8:    TUINT8,
	TUINT8:   TUINT8,
	TINT16:   TUINT16,
	TUINT16:  TUINT16,
	TINT32:   TUINT32,
	TUINT32:  TUINT32,

		// result of comparisons (untyped bool), intermediate
		// (delayed-checked) rhs operands of shifts, and as
		// the value nil.
		switch x.typ.(*Basic).kind {
		case UntypedBool:
			if !isBoolean(target) {
				return nil, nil, InvalidUntypedConversion
			}
		case UntypedInt, UntypedRune, UntypedFloat, UntypedComplex:
			if !isNumeric(target) {
				return nil, nil, InvalidUntypedConversion
			}

(Load <t> ptr mem) && is16BitInt(t) &&  t.IsSigned() => (MOVHload ptr mem)
(Load <t> ptr mem) && is16BitInt(t) && !t.IsSigned() => (MOVHZload ptr mem)
(Load <t> ptr mem) && t.IsBoolean() => (MOVBZload ptr mem)
(Load <t> ptr mem) && is8BitInt(t) &&  t.IsSigned() => (MOVBreg (MOVBZload ptr mem)) // PPC has no signed-byte load.
(Load <t> ptr mem) && is8BitInt(t) && !t.IsSigned() => (MOVBZload ptr mem)

// a register. It assumes float64 values will always fit into registers
// even if that isn't strictly true.
func registerizable(b *Block, typ *types.Type) bool {
	if typ.IsPtrShaped() || typ.IsFloat() || typ.IsBoolean() {
		return true
	}
	if typ.IsInteger() {
		return typ.Size() <= b.Func.Config.RegSize
	}
	return false
}

// needRaceCleanup reports whether this call to racefuncenter/exit isn't needed.

(Load <t> ptr mem) && is16BitInt(t) && !t.IsSigned() => (MOVHZload ptr mem)
(Load <t> ptr mem) && is8BitInt(t)  &&  t.IsSigned() => (MOVBload ptr mem)
(Load <t> ptr mem) && (t.IsBoolean() || (is8BitInt(t) && !t.IsSigned())) => (MOVBZload ptr mem)
(Load <t> ptr mem) && is32BitFloat(t) => (FMOVSload ptr mem)
(Load <t> ptr mem) && is64BitFloat(t) => (FMOVDload ptr mem)

// Lowering stores

(Load <t> ptr mem) && (is64BitInt(t) || isPtr(t)) => (MOVQload ptr mem)
(Load <t> ptr mem) && is32BitInt(t) => (MOVLload ptr mem)
(Load <t> ptr mem) && is16BitInt(t) => (MOVWload ptr mem)
(Load <t> ptr mem) && (t.IsBoolean() || is8BitInt(t)) => (MOVBload ptr mem)
(Load <t> ptr mem) && is32BitFloat(t) => (MOVSSload ptr mem)
(Load <t> ptr mem) && is64BitFloat(t) => (MOVSDload ptr mem)

// Lowering stores

(LocalAddr <t> {sym} base mem) && t.Elem().HasPointers() => (MOVWaddr {sym} (SPanchored base mem))
(LocalAddr <t> {sym} base _)  && !t.Elem().HasPointers() => (MOVWaddr {sym} base)

// loads
(Load <t> ptr mem) && t.IsBoolean() => (MOVBUload ptr mem)
(Load <t> ptr mem) && (is8BitInt(t)  &&  t.IsSigned()) => (MOVBload ptr mem)
(Load <t> ptr mem) && (is8BitInt(t)  && !t.IsSigned()) => (MOVBUload ptr mem)