z := uint64(f32toint64(y))
	return z | (1 << 63)
}

func fuint64to64(x uint64) uint64 {
	if int64(x) >= 0 {
		return fint64to64(int64(x))
	}
	// See ../cmd/compile/internal/ssagen/ssa.go:uint64Tofloat
	y := x & 1
	z := x >> 1
	z = z | y
	r := fint64to64(int64(z))
	return fadd64(r, r)
}

func fuint64to32(x uint64) uint32 {
	if int64(x) >= 0 {
		return fint64to32(int64(x))
	}

		ssa.OpCvt64Uto32F: {typecheck.LookupRuntimeFunc("fuint64to32"), types.TFLOAT32},
		ssa.OpCvt32Fto64U: {typecheck.LookupRuntimeFunc("f32touint64"), types.TUINT64},
		ssa.OpCvt32to64F:  {typecheck.LookupRuntimeFunc("fint32to64"), types.TFLOAT64},
		ssa.OpCvt64Fto32:  {typecheck.LookupRuntimeFunc("f64toint32"), types.TINT32},
		ssa.OpCvt64to64F:  {typecheck.LookupRuntimeFunc("fint64to64"), types.TFLOAT64},