func TestFloatInt64(t *testing.T) {
	for _, test := range []struct {
		x   string
		out int64
		acc Accuracy
	}{
		{"-Inf", math.MinInt64, Above},
		{"-1e10000", math.MinInt64, Above},
		{"-9223372036854775809", math.MinInt64, Above},
		{"-9223372036854775808.000000000000000000001", math.MinInt64, Above},
		{"-9223372036854775808", -9223372036854775808, Exact},

		asm:    ppc64.AADDZE,
		reg: regInfo{
			inputs: []inputInfo{
				{1, 9223372036854775808}, // XER
				{0, 1073733630},          // SP SB R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29
			},
			clobbers: 9223372036854775808, // XER
			outputs: []outputInfo{
				{1, 9223372036854775808}, // XER

	N int64
}

func (r *atLeastReader) Read(p []byte) (int, error) {
	if r.N <= 0 {
		return 0, io.EOF
	}
	n, err := r.R.Read(p)
	r.N -= int64(n) // won't underflow unless len(p) >= n > 9223372036854775809
	if r.N > 0 && err == io.EOF {
		return n, io.ErrUnexpectedEOF
	}
	if r.N <= 0 && err == nil {
		return n, io.EOF
	}
	return n, err
}

		{"0.9n", decQuantity(1, -9, DecimalSI)},
		{"0.00000012345", decQuantity(124, -9, DecimalSI)},
		{"0.00000012354", decQuantity(124, -9, DecimalSI)},
		{"9Ei", Quantity{d: maxAllowed, Format: BinarySI}},
		{"9223372036854775807Ki", Quantity{d: maxAllowed, Format: BinarySI}},
		{"12E", decQuantity(12, 18, DecimalSI)},

		// We'll accept fractional binary stuff, too.
		{"100.035Ki", decQuantity(10243584, -2, BinarySI)},

	// 9007199254740993 = 1<<53+1 cannot be stored precisely in a float64
	{"9007199254740993ns", (1<<53 + 1) * Nanosecond},
	// largest duration that can be represented by int64 in nanoseconds
	{"9223372036854775807ns", (1<<63 - 1) * Nanosecond},
	{"9223372036854775.807us", (1<<63 - 1) * Nanosecond},
	{"9223372036s854ms775us807ns", (1<<63 - 1) * Nanosecond},
	{"-9223372036854775808ns", -1 << 63 * Nanosecond},