// to the precision and rounding mode of the result variable.
//
// If the provided result precision is 0 (see below), it is set to the
// precision of the argument with the largest precision value before any
// rounding takes place, and the rounding mode remains unchanged. Thus,
// uninitialized Floats provided as result arguments will have their
// precision set to a reasonable value determined by the operands, and

	AFSGNJXS
	AFMVXS
	AFMVSX
	AFMVXW
	AFMVWX

	// 11.8: Single-Precision Floating-Point Compare Instructions
	AFEQS
	AFLTS
	AFLES

	// 11.9: Single-Precision Floating-Point Classify Instruction
	AFCLASSS

	// 12.3: Double-Precision Load and Store Instructions
	AFLD
	AFSD

	// 12.4: Double-Precision Floating-Point Computational Instructions
	AFADDD
	AFSUBD
	AFMULD
	AFDIVD

Precision is specified after the (optional) width by a period followed by a
decimal number. If no period is present, a default precision is used.
A period with no following number specifies a precision of zero.
Examples:

	%f     default width, default precision
	%9f    width 9, default precision
	%.2f   default width, precision 2
	%9.2f  width 9, precision 2
	%9.f   width 9, precision 0

     * will not be used and a network request will be made.
     *
     * @param maxAge a non-negative duration. This is stored and transmitted with [TimeUnit.SECONDS]
     *     precision; finer precision will be lost.
     */
    fun maxAge(maxAge: Duration) =
      apply {
        val maxAgeSeconds = maxAge.inWholeSeconds
        require(maxAgeSeconds >= 0) { "maxAge < 0: $maxAgeSeconds" }

	//   2) round to desired precision
	//   3) read digits out and format

	// 1) convert Float to multiprecision decimal
	var d decimal // == 0.0
	if x.form == finite {
		// x != 0
		d.init(x.mant, int(x.exp)-x.mant.bitLen())
	}

	// 2) round to desired precision
	shortest := false
	if prec < 0 {
		shortest = true
		roundShortest(&d, x)
		// Precision for shortest representation mode.
		switch fmt {

		i--
		buf[i] = ' '
	}

	// Left padding with zeros has already been handled like precision earlier
	// or the f.zero flag is ignored due to an explicitly set precision.
	oldZero := f.zero
	f.zero = false
	f.pad(buf[i:])
	f.zero = oldZero
}

// truncateString truncates the string s to the specified precision, if present.
func (f *fmt) truncateString(s string) string {
	if f.precPresent {
		n := f.prec

		if eprec > digs.nd && digs.nd >= digs.dp {
			eprec = digs.nd
		}
		// %e is used if the exponent from the conversion
		// is less than -4 or greater than or equal to the precision.
		// if precision was the shortest possible, use precision 6 for this decision.
		if shortest {
			eprec = 6
		}
		exp := digs.dp - 1
		if exp < -4 || exp >= eprec {
			if prec > digs.nd {
				prec = digs.nd
			}

		},
		{
			name:          "half precision",
			in:            hex("f94200"),
			want:          float64(3),
			assertOnError: assertNilError,
		},
		{
			name:          "double precision without fractional component",
			in:            hex("fb4000000000000000"),
			want:          float64(2),
			assertOnError: assertNilError,
		},
		{
			name:          "single precision without fractional component",

			mantissa = int64(int64(mantissa) << uint64(exponent))
			// 1Mi (2^20) has ~6 digits of decimal precision, so exponent*3/10 -1 is roughly the precision
			precision = 15 - int32(len(num)) - int32(float32(exponent)*3/10) - 1
		default:
			precision = -1
		}
	}

	if precision >= 0 {
		// if we have a denominator, shift the entire value to the left by the number of places in the
		// denominator

	FNMADDS	F1, F2, F3, F4				// 4f822018

	// 11.8: Single-Precision Floating-Point Compare Instructions
	FEQS	F0, F1, X7				// d3a300a0
	FLTS	F0, F1, X7				// d39300a0
	FLES	F0, F1, X7				// d38300a0

	// 11.9: Single-Precision Floating-Point Classify Instruction
	FCLASSS	F0, X5					// d31200e0

	// 12.3: Double-Precision Load and Store Instructions
	FLD	(X5), F0				// 07b00200
	FLD	4(X5), F0				// 07b04200