// returns the offset of the first character.
func (d Duration) format(buf *[32]byte) int {
	// Largest time is 2540400h10m10.000000000s
	w := len(buf)

	u := uint64(d)
	neg := d < 0
	if neg {
		u = -u
	}

	if u < uint64(Second) {
		// Special case: if duration is smaller than a second,
		// use smaller units, like 1.2ms
		var prec int
		w--
		buf[w] = 's'
		w--

		nil,
		{0},
		{1},
		{0, 1, 2, 3, 4},
		{4, 3, 2, 1, 0},
		{4, 3, 2, 1, 0, 0, 0, 0},
	} {
		var z Int
		z.neg = true
		got := z.SetBits(test)
		want := norm(test)
		if got.abs.cmp(want) != 0 {
			t.Errorf("SetBits(%v) = %v; want %v", test, got.abs, want)
		}

		if got.neg {
			t.Errorf("SetBits(%v): got negative result", test)
		}

		bits := nat(z.Bits())
		if bits.cmp(want) != 0 {

		{name: "NEGshiftLL", argLength: 1, reg: gp11, asm: "NEG", aux: "Int64"},                   // -(arg0<<auxInt), auxInt should be in the range 0 to 63.
		{name: "NEGshiftRL", argLength: 1, reg: gp11, asm: "NEG", aux: "Int64"},                   // -(arg0>>auxInt), unsigned shift, auxInt should be in the range 0 to 63.

  // CHECK-DAG: %[[LE2:.*]] = "tf.LessEqual"(%[[OFFSET]], %[[NUM_LOWER_OR_M]]) : (tensor<4x5xi64>, tensor<i64>) -> tensor<4x5xi1>
  // CHECK-DAG: %[[NEG:.*]] = "tf.Neg"(%[[NUM_UPPER_OR_N]]) : (tensor<i64>) -> tensor<i64>
  // CHECK-DAG: %[[GE:.*]] = "tf.GreaterEqual"(%[[OFFSET]], %[[NEG]]) : (tensor<4x5xi64>, tensor<i64>) -> tensor<4x5xi1>

		}
		st.subs.add(ret)
	}
	return ret
}

// number parses:
//
//	number ::= [n] <(non-negative decimal integer)>
func (st *state) number() int {
	neg := false
	if len(st.str) > 0 && st.str[0] == 'n' {
		neg = true
		st.advance(1)
	}
	if len(st.str) == 0 || !isDigit(st.str[0]) {
		st.fail("missing number")
	}
	val := 0
	for len(st.str) > 0 && isDigit(st.str[0]) {

,,oc?saak,t&en?ikcats,???i&a?v??k!.&gro?ku,lim?moc?oi,pj,su,ten?ude?v&og?t,???m!.&drp?gro?lim?m&o&c?n??t??oc?ude?vog??pk??n!.&dtl,eman?gro?hcs?i!bom??l&im?oc,?m&oc!.topsgolb,?rif,?neg,ogn,ten?ude?vog??aw?i!b!mulp??car?d&art?dew??h&sif?tolc??k&iv?oo&b?c???ls?n&aelc?iart??p!pohs??re&enigne?tac??t&ad?ekram?hgil?lusnoc?neg?ov?soh!.tfarcnepo,??vi&g?l???o!s??u&rehcisrev?smas?tarebsnegömrev???o&d?lb?og!.&duolc,etalsnart,???r&2n084qlj--nx?ebmoolb?o!.&77ndc.c:sr,,a&remacytirucesym,t&neimip,sivretla,?z,?b...

,,oc?saak,t&en?ikcats,???i&a?v??k!.&gro?ku,lim?moc?oi,pj,su,ten?ude?v&og?t,???m!.&drp?gro?lim?m&o&c?n??t??oc?ude?vog??pk??n!.&dtl,eman?gro?hcs?i!bom??l&im?oc,?m&oc!.topsgolb,?rif,?neg,ogn,ten?ude?vog??aw?i!b!mulp??car?d&art?dew??h&sif?tolc??k&iv?oo&b?c???ls?n&aelc?iart??p!pohs??re&enigne?tac??t&ad?ekram?hgil?lusnoc?neg?ov?soh!.tfarcnepo,??vi&g?l???o!s??u&rehcisrev?smas?tarebsnegömrev???o&d?lb?og!.&duolc,etalsnart,???r&2n084qlj--nx?ebmoolb?o!.&77ndc.c:sr,,a&remacytirucesym,t&neimip,sivretla,?z,?b...

		{name: "RISBGZ", argLength: 1, reg: gp11, asm: "RISBGZ", aux: "S390XRotateParams", clobberFlags: true},                   // rotate then insert selected bits [into zero]

		// unary ops
		{name: "NEG", argLength: 1, reg: gp11, asm: "NEG", clobberFlags: true},   // -arg0
		{name: "NEGW", argLength: 1, reg: gp11, asm: "NEGW", clobberFlags: true}, // -arg0

		{name: "NOT", argLength: 1, reg: gp11, resultInArg0: true, clobberFlags: true},  // ^arg0

		// Rotation instructions are supported natively.
		return []*instruction{ins}
	}

	switch ins.as {
	case AROL, AROLW, AROR, ARORW:
		// ROL -> OR (SLL x y) (SRL x (NEG y))
		// ROR -> OR (SRL x y) (SLL x (NEG y))
		sllOp, srlOp := ASLL, ASRL
		if ins.as == AROLW || ins.as == ARORW {
			sllOp, srlOp = ASLLW, ASRLW
		}
		shift1, shift2 := sllOp, srlOp
		if ins.as == AROR || ins.as == ARORW {

(Avg32u <t> x y) => (ADD (SRLconst <t> (SUB <t> x y) [1]) y)

(And(32|16|8) ...) => (AND ...)
(Or(32|16|8) ...) => (OR ...)
(Xor(32|16|8) ...) => (XOR ...)

// unary ops
(Neg(32|16|8) x) => (RSBconst [0] x)
(Neg(32|64)F ...) => (NEG(F|D) ...)

(Com(32|16|8) ...) => (MVN ...)

(Sqrt ...) => (SQRTD ...)
(Sqrt32 ...) => (SQRTF ...)
(Abs ...) => (ABSD ...)

// TODO: optimize this for ARMv5 and ARMv6