if i := int(s.Sect) - 1; 0 <= i && i < len(f.Sections) {
						sect := f.Sections[i]
						if sect.Addr <= s.Value && s.Value < sect.Addr+sect.Size {
							if sdat, err := sect.Data(); err == nil {
								data := sdat[s.Value-sect.Addr:]
								ints = make([]int64, len(data)/8)
								for i := range ints {
									ints[i] = int64(bo.Uint64(data[i*8:]))
								}
							}
						}
					}

				t.Errorf("%s: got %s; want %s", test.x, got, x)
			}
		}
	}

	// check that supplied *Rat is used
	for _, f := range []string{"0", "1", "-1", "1234"} {
		x := makeFloat(f)
		r := new(Rat)
		if res, _ := x.Rat(r); res != r {
			t.Errorf("(%s).Rat is not using supplied *Rat", f)
		}
	}
}

func TestFloatAbs(t *testing.T) {
	for _, test := range []string{
		"0",

x?697uto--nx?75yrpk--nx?9ctdvkce--nx?a!.mon?d?er?olnwod??b2babgm--nx?c!.vog?g9a2g2b0ae0chclc--nx??e&m!bulc??r!k??sopxe?timil?w??fc?g!.&ude?vog???h&d3tbgm--nx?p?t??i!.&ased?bew?ca?etrof,hcs?lim?o&c!.topsgolb,?g??palf,ro?sepnop?ten?ym?zib??b?ordna?p?rdam??l&iub?og?row??m!.&ed,ot,pj,t&a,opsgolb,???n&a&b?l!.citats:.&setis,ved,?,raas???ob?uf??o&of?rp??r&a&c&tiderc?yalcrab??ugnav??ef506w4b--nx?k!.&oc,ude,?jh3a1habgm--nx??of??s!.&dem?gro?moc?ofni?ten?ude?v&og?t???m!kcrem???t!.topsgolb,excwkcc--nx?l??uo...

x?697uto--nx?75yrpk--nx?9ctdvkce--nx?a!.mon?d?er?olnwod??b2babgm--nx?c!.vog?g9a2g2b0ae0chclc--nx??e&m!bulc??r!k??sopxe?timil?w??fc?g!.&ude?vog???h&d3tbgm--nx?p?t??i!.&ased?bew?ca?etrof,hcs?lim?o&c!.topsgolb,?g??palf,ro?sepnop?ten?ym?zib??b?ordna?p?rdam??l&iub?og?row??m!.&ed,ot,pj,t&a,opsgolb,???n&a&b?l!.citats:.&setis,ved,?,raas???ob?uf??o&of?rp??r&a&c&tiderc?yalcrab??ugnav??ef506w4b--nx?k!.&oc,ude,?jh3a1habgm--nx??of??s!.&dem?gro?moc?ofni?ten?ude?v&og?t???m!kcrem???t!.topsgolb,excwkcc--nx?l??uo...

// the most significant bit due to mask produced by arithmetic shift.
// Simply isolate the most significant bit itself and place it in the
// correct position.
//
// Example: (int64(x) >> 63) & 0x8 -> RISBGZ $60, $60, $4, Rsrc, Rdst
(RISBGZ (SRADconst x [c]) {r})
  && r.Start == r.End           // single bit selected
  && (r.Start+r.Amount)&63 <= c // equivalent to most significant bit of x