{"-1e9", true, false, true, false, -1e9, 0, -1e9, 0},
	{"-1.2", false, false, true, false, 0, 0, -1.2, 0},
	{"1e19", false, true, true, false, 0, 1e19, 1e19, 0},
	{"1e1_9", false, true, true, false, 0, 1e19, 1e19, 0},
	{"1E19", false, true, true, false, 0, 1e19, 1e19, 0},
	{"-1e19", false, false, true, false, 0, 0, -1e19, 0},
	{"0x_1p4", true, true, true, false, 16, 16, 16, 0},
	{"0X_1P4", true, true, true, false, 16, 16, 16, 0},

package main

func isPow10(x uint64) bool {
	switch x {
	case 1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
		1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19:
		return true
	}
	return false
}

func main() {
	var x uint64 = 1

	for {
		if !isPow10(x) || isPow10(x-1) || isPow10(x+1) {
			panic(x)
		}
		next := x * 10
		if next/10 != x {

package math

// pow10tab stores the pre-computed values 10**i for i < 32.
var pow10tab = [...]float64{
	1e00, 1e01, 1e02, 1e03, 1e04, 1e05, 1e06, 1e07, 1e08, 1e09,
	1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19,
	1e20, 1e21, 1e22, 1e23, 1e24, 1e25, 1e26, 1e27, 1e28, 1e29,
	1e30, 1e31,
}

// pow10postab32 stores the pre-computed value for 10**(i*32) at index i.
var pow10postab32 = [...]float64{

}

// AsScaledInt64 returns an int64 representing the value of this amount at the specified scale,
// rounding up, or false if that would result in overflow. (1e20).AsScaledInt64(1) would result
// in overflow because 1e19 is not representable as an int64. Note that setting a scale larger
// than the current value may result in loss of precision - i.e. (1e-6).AsScaledInt64(0) would
// return 1, because 0.000001 is rounded up to 1.

	}
	return bits, overflow
}

// Exact powers of 10.
var float64pow10 = []float64{
	1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
	1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19,
	1e20, 1e21, 1e22,
}
var float32pow10 = []float32{1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, 1e10}

// If possible to convert decimal representation to 64-bit float f exactly,

	formatDecimal(d, di, !d0, roundUp, prec)
	// Adjust exponent
	d.dp -= q
}

var uint64pow10 = [...]uint64{
	1, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
	1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19,
}

// formatDecimal fills d with at most prec decimal digits
// of mantissa m. The boolean trunc indicates whether m
// is truncated compared to the original number being formatted.

const MaxBase = 10 + ('z' - 'a' + 1) + ('Z' - 'A' + 1)
const maxBaseSmall = 10 + ('z' - 'a' + 1)

// maxPow returns (b**n, n) such that b**n is the largest power b**n <= _M.
// For instance maxPow(10) == (1e19, 19) for 19 decimal digits in a 64bit Word.
// In other words, at most n digits in base b fit into a Word.
// TODO(gri) replace this with a table, generated at build time.
func maxPow(b Word) (p Word, n int) {

	{Nextafter(1, 2), float64(1 << 63)},
	{Nextafter(1, -2), float64(1 << 63)},
	{Nextafter(-1, 2), float64(1 << 63)},
	{Nextafter(-1, -2), float64(1 << 63)},

	// Issue #57465
	{Copysign(0, -1), 1e19},
	{Copysign(0, -1), -1e19},
	{Copysign(0, -1), 1<<53 - 1},
	{Copysign(0, -1), -(1<<53 - 1)},
}
var powSC = []float64{
	0,               // pow(-Inf, -Pi)
	Copysign(0, -1), // pow(-Inf, -3)

	{0x0000000000000000, 0x8E1BC9BF04000000}, // 1e16
	{0x0000000000000000, 0xB1A2BC2EC5000000}, // 1e17
	{0x0000000000000000, 0xDE0B6B3A76400000}, // 1e18
	{0x0000000000000000, 0x8AC7230489E80000}, // 1e19
	{0x0000000000000000, 0xAD78EBC5AC620000}, // 1e20
	{0x0000000000000000, 0xD8D726B7177A8000}, // 1e21
	{0x0000000000000000, 0x878678326EAC9000}, // 1e22
	{0x0000000000000000, 0xA968163F0A57B400}, // 1e23

		{Equal, 15, 19},
		{Equal, 15, vconst(20)},
		{Equal, 15, vconst2(20)},
		{Equal, 15, 25},

		{Equal, 16, 17},
		{Equal, 16, 18},
		{Equal, 16, 19},
		{Equal, 16, vconst(20)},
		{Equal, 16, vconst2(20)},
		{Equal, 16, 25},

		{Equal, 17, 18},
		{Equal, 17, 19},
		{Equal, 17, vconst(20)},
		{Equal, 17, vconst2(20)},
		{Equal, 17, 25},

		{Equal, 18, 19},