strconv,js: f64_to_str works on JS backend now; Fix BigInt usage in infix expressions (#12464)
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GitHub
parent
1d2b16dde2
commit
a8a1e9381f
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@ -0,0 +1 @@
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module strconv
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@ -20,42 +20,6 @@ https://github.com/cespare/ryu/tree/ba56a33f39e3bbbfa409095d0f9ae168a595feea
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=============================================================================*/
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// pow of ten table used by n_digit reduction
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const (
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ten_pow_table_64 = [
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u64(1),
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u64(10),
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u64(100),
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u64(1000),
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u64(10000),
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u64(100000),
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u64(1000000),
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u64(10000000),
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u64(100000000),
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u64(1000000000),
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u64(10000000000),
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u64(100000000000),
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u64(1000000000000),
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u64(10000000000000),
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u64(100000000000000),
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u64(1000000000000000),
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u64(10000000000000000),
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u64(100000000000000000),
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u64(1000000000000000000),
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u64(10000000000000000000),
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]
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)
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//=============================================================================
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// Conversion Functions
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//=============================================================================
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const (
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mantbits64 = u32(52)
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expbits64 = u32(11)
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bias64 = 1023 // f64 exponent bias
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maxexp64 = 2047
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)
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[direct_array_access]
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fn (d Dec64) get_string_64(neg bool, i_n_digit int, i_pad_digit int) string {
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mut n_digit := i_n_digit + 1
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@ -87,10 +51,10 @@ fn (d Dec64) get_string_64(neg bool, i_n_digit int, i_pad_digit int) string {
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// rounding last used digit
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if n_digit < out_len {
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// println("out:[$out]")
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out += strconv.ten_pow_table_64[out_len - n_digit - 1] * 5 // round to up
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out /= strconv.ten_pow_table_64[out_len - n_digit]
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out += ten_pow_table_64[out_len - n_digit - 1] * 5 // round to up
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out /= ten_pow_table_64[out_len - n_digit]
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// println("out1:[$out] ${d.m / ten_pow_table_64[out_len - n_digit ]}")
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if d.m / strconv.ten_pow_table_64[out_len - n_digit] < out {
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if d.m / ten_pow_table_64[out_len - n_digit] < out {
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d_exp++
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n_digit++
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}
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@ -170,11 +134,11 @@ fn (d Dec64) get_string_64(neg bool, i_n_digit int, i_pad_digit int) string {
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fn f64_to_decimal_exact_int(i_mant u64, exp u64) (Dec64, bool) {
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mut d := Dec64{}
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e := exp - strconv.bias64
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if e > strconv.mantbits64 {
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e := exp - bias64
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if e > mantbits64 {
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return d, false
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}
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shift := strconv.mantbits64 - e
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shift := mantbits64 - e
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mant := i_mant | u64(0x0010_0000_0000_0000) // implicit 1
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// mant := i_mant | (1 << mantbits64) // implicit 1
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d.m = mant >> shift
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@ -195,11 +159,11 @@ fn f64_to_decimal(mant u64, exp u64) Dec64 {
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if exp == 0 {
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// We subtract 2 so that the bounds computation has
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// 2 additional bits.
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e2 = 1 - strconv.bias64 - int(strconv.mantbits64) - 2
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e2 = 1 - bias64 - int(mantbits64) - 2
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m2 = mant
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} else {
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e2 = int(exp) - strconv.bias64 - int(strconv.mantbits64) - 2
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m2 = (u64(1) << strconv.mantbits64) | mant
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e2 = int(exp) - bias64 - int(mantbits64) - 2
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m2 = (u64(1) << mantbits64) | mant
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}
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even := (m2 & 1) == 0
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accept_bounds := even
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@ -373,13 +337,13 @@ pub fn f64_to_str(f f64, n_digit int) string {
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u1.f = f
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u := unsafe { u1.u }
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neg := (u >> (strconv.mantbits64 + strconv.expbits64)) != 0
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mant := u & ((u64(1) << strconv.mantbits64) - u64(1))
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exp := (u >> strconv.mantbits64) & ((u64(1) << strconv.expbits64) - u64(1))
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neg := (u >> (mantbits64 + expbits64)) != 0
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mant := u & ((u64(1) << mantbits64) - u64(1))
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exp := (u >> mantbits64) & ((u64(1) << expbits64) - u64(1))
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// println("s:${neg} mant:${mant} exp:${exp} float:${f} byte:${u1.u:016lx}")
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// Exit early for easy cases.
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if (exp == strconv.maxexp64) || (exp == 0 && mant == 0) {
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if (exp == maxexp64) || (exp == 0 && mant == 0) {
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return get_string_special(neg, exp == 0, mant == 0)
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}
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@ -398,13 +362,13 @@ pub fn f64_to_str_pad(f f64, n_digit int) string {
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u1.f = f
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u := unsafe { u1.u }
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neg := (u >> (strconv.mantbits64 + strconv.expbits64)) != 0
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mant := u & ((u64(1) << strconv.mantbits64) - u64(1))
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exp := (u >> strconv.mantbits64) & ((u64(1) << strconv.expbits64) - u64(1))
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neg := (u >> (mantbits64 + expbits64)) != 0
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mant := u & ((u64(1) << mantbits64) - u64(1))
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exp := (u >> mantbits64) & ((u64(1) << expbits64) - u64(1))
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// println("s:${neg} mant:${mant} exp:${exp} float:${f} byte:${u1.u:016lx}")
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// Exit early for easy cases.
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if (exp == strconv.maxexp64) || (exp == 0 && mant == 0) {
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if (exp == maxexp64) || (exp == 0 && mant == 0) {
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return get_string_special(neg, exp == 0, mant == 0)
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}
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@ -0,0 +1,339 @@
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module strconv
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import math
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fn (d Dec64) get_string_64(neg bool, i_n_digit int, i_pad_digit int) string {
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mut n_digit := i_n_digit + 1
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pad_digit := i_pad_digit + 1
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mut out := d.m
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mut d_exp := d.e
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// mut out_len := decimal_len_64(out)
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mut out_len := dec_digits(out)
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out_len_original := out_len
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mut fw_zeros := 0
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if pad_digit > out_len {
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fw_zeros = pad_digit - out_len
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}
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mut buf := []byte{len: (out_len + 6 + 1 + 1 + fw_zeros)} // sign + mant_len + . + e + e_sign + exp_len(2) + \0}
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mut i := 0
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if neg {
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#buf.arr.arr[i.val] = '-'.charCodeAt()
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i++
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}
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mut disp := 0
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if out_len <= 1 {
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disp = 1
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}
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// rounding last used digit
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if n_digit < out_len {
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// println("out:[$out]")
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out += ten_pow_table_64[out_len - n_digit - 1] * 5 // round to up
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out /= ten_pow_table_64[out_len - n_digit]
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// println("out1:[$out] ${d.m / ten_pow_table_64[out_len - n_digit ]}")
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if d.m / ten_pow_table_64[out_len - n_digit] < out {
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d_exp++
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n_digit++
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}
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// println("cmp: ${d.m/ten_pow_table_64[out_len - n_digit ]} ${out/ten_pow_table_64[out_len - n_digit ]}")
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out_len = n_digit
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// println("orig: ${out_len_original} new len: ${out_len} out:[$out]")
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}
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y := i + out_len
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mut x := 0
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for x < (out_len - disp - 1) {
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#buf.arr.arr[y.val - x.val].val = '0'.charCodeAt() + Number(out.valueOf() % 10n)
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out /= 10
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i++
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x++
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}
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// no decimal digits needed, end here
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if i_n_digit == 0 {
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res := ''
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#buf.arr.arr.forEach((it) => it.val == 0 ? res.str : res.str += String.fromCharCode(it.val))
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return res
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}
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if out_len >= 1 {
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buf[y - x] = `.`
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x++
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i++
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}
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if y - x >= 0 {
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#buf.arr.arr[y.val - x.val].val = '0'.charCodeAt() + Number(out.valueOf() % 10n)
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i++
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}
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for fw_zeros > 0 {
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#buf.arr.arr[i.val].val = '0'.charCodeAt()
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i++
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fw_zeros--
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}
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#buf.arr.arr[i.val].val = 'e'.charCodeAt()
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i++
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mut exp := d_exp + out_len_original - 1
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if exp < 0 {
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#buf.arr.arr[i.val].val = '-'.charCodeAt()
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i++
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exp = -exp
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} else {
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#buf.arr.arr[i.val].val = '+'.charCodeAt()
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i++
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}
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// Always print at least two digits to match strconv's formatting.
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d2 := exp % 10
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exp /= 10
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d1 := exp % 10
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_ := d1
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_ := d2
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d0 := exp / 10
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if d0 > 0 {
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#buf.arr.arr[i].val = '0'.charCodeAt() + d0.val
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i++
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}
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#buf.arr.arr[i].val = '0'.charCodeAt() + d1.val
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i++
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#buf.arr.arr[i].val = '0' + d2.val
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i++
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#buf.arr.arr[i].val = 0
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res := ''
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#buf.arr.arr.forEach((it) => it.val == 0 ? res.str : res.str += String.fromCharCode(it.val))
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return res
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}
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fn f64_to_decimal_exact_int(i_mant u64, exp u64) (Dec64, bool) {
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mut d := Dec64{}
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e := exp - bias64
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if e > mantbits64 {
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return d, false
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}
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shift := mantbits64 - e
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mant := i_mant | u64(0x0010_0000_0000_0000) // implicit 1
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// mant := i_mant | (1 << mantbits64) // implicit 1
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d.m = mant >> shift
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if (d.m << shift) != mant {
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return d, false
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}
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for (d.m % 10) == 0 {
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d.m /= 10
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d.e++
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}
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return d, true
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}
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fn f64_to_decimal(mant u64, exp u64) Dec64 {
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mut e2 := 0
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mut m2 := u64(0)
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if exp == 0 {
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// We subtract 2 so that the bounds computation has
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// 2 additional bits.
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e2 = 1 - bias64 - int(mantbits64) - 2
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m2 = mant
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} else {
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e2 = int(exp) - bias64 - int(mantbits64) - 2
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m2 = (u64(1) << mantbits64) | mant
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}
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even := (m2 & 1) == 0
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accept_bounds := even
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// Step 2: Determine the interval of valid decimal representations.
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mv := u64(4 * m2)
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mm_shift := bool_to_u64(mant != 0 || exp <= 1)
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// Step 3: Convert to a decimal power base uing 128-bit arithmetic.
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mut vr := u64(0)
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mut vp := u64(0)
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mut vm := u64(0)
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mut e10 := 0
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mut vm_is_trailing_zeros := false
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mut vr_is_trailing_zeros := false
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if e2 >= 0 {
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// This expression is slightly faster than max(0, log10Pow2(e2) - 1).
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q := log10_pow2(e2) - bool_to_u32(e2 > 3)
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e10 = int(q)
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k := pow5_inv_num_bits_64 + pow5_bits(int(q)) - 1
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i := -e2 + int(q) + k
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mul := pow5_inv_split_64[q]
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vr = mul_shift_64(u64(4) * m2, mul, i)
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vp = mul_shift_64(u64(4) * m2 + u64(2), mul, i)
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vm = mul_shift_64(u64(4) * m2 - u64(1) - mm_shift, mul, i)
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if q <= 21 {
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// This should use q <= 22, but I think 21 is also safe.
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// Smaller values may still be safe, but it's more
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// difficult to reason about them. Only one of mp, mv,
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// and mm can be a multiple of 5, if any.
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if mv % 5 == 0 {
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vr_is_trailing_zeros = multiple_of_power_of_five_64(mv, q)
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} else if accept_bounds {
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// Same as min(e2 + (^mm & 1), pow5Factor64(mm)) >= q
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// <=> e2 + (^mm & 1) >= q && pow5Factor64(mm) >= q
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// <=> true && pow5Factor64(mm) >= q, since e2 >= q.
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vm_is_trailing_zeros = multiple_of_power_of_five_64(mv - 1 - mm_shift,
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q)
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} else if multiple_of_power_of_five_64(mv + 2, q) {
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vp--
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}
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}
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} else {
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// This expression is slightly faster than max(0, log10Pow5(-e2) - 1).
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q := log10_pow5(-e2) - bool_to_u32(-e2 > 1)
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e10 = int(q) + e2
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i := -e2 - int(q)
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k := pow5_bits(i) - pow5_num_bits_64
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j := int(q) - k
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mul := pow5_split_64[i]
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vr = mul_shift_64(u64(4) * m2, mul, j)
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vp = mul_shift_64(u64(4) * m2 + u64(2), mul, j)
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vm = mul_shift_64(u64(4) * m2 - u64(1) - mm_shift, mul, j)
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if q <= 1 {
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// {vr,vp,vm} is trailing zeros if {mv,mp,mm} has at least q trailing 0 bits.
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// mv = 4 * m2, so it always has at least two trailing 0 bits.
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vr_is_trailing_zeros = true
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if accept_bounds {
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// mm = mv - 1 - mmShift, so it has 1 trailing 0 bit iff mmShift == 1.
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vm_is_trailing_zeros = (mm_shift == 1)
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} else {
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// mp = mv + 2, so it always has at least one trailing 0 bit.
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vp--
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}
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} else if q < 63 { // TODO(ulfjack/cespare): Use a tighter bound here.
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// We need to compute min(ntz(mv), pow5Factor64(mv) - e2) >= q - 1
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// <=> ntz(mv) >= q - 1 && pow5Factor64(mv) - e2 >= q - 1
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// <=> ntz(mv) >= q - 1 (e2 is negative and -e2 >= q)
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// <=> (mv & ((1 << (q - 1)) - 1)) == 0
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// We also need to make sure that the left shift does not overflow.
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vr_is_trailing_zeros = multiple_of_power_of_two_64(mv, q - 1)
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}
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}
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// Step 4: Find the shortest decimal representation
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// in the interval of valid representations.
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mut removed := 0
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mut last_removed_digit := byte(0)
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mut out := u64(0)
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// On average, we remove ~2 digits.
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if vm_is_trailing_zeros || vr_is_trailing_zeros {
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// General case, which happens rarely (~0.7%).
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for {
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vp_div_10 := vp / 10
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vm_div_10 := vm / 10
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if vp_div_10 <= vm_div_10 {
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break
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}
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vm_mod_10 := vm % 10
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vr_div_10 := vr / 10
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vr_mod_10 := vr % 10
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vm_is_trailing_zeros = vm_is_trailing_zeros && vm_mod_10 == 0
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vr_is_trailing_zeros = vr_is_trailing_zeros && (last_removed_digit == 0)
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last_removed_digit = byte(vr_mod_10)
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vr = vr_div_10
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vp = vp_div_10
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vm = vm_div_10
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removed++
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}
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if vm_is_trailing_zeros {
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for {
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vm_div_10 := vm / 10
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vm_mod_10 := vm % 10
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if vm_mod_10 != 0 {
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break
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}
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vp_div_10 := vp / 10
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vr_div_10 := vr / 10
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vr_mod_10 := vr % 10
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vr_is_trailing_zeros = vr_is_trailing_zeros && (last_removed_digit == 0)
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last_removed_digit = byte(vr_mod_10)
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vr = vr_div_10
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vp = vp_div_10
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vm = vm_div_10
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removed++
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}
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}
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if vr_is_trailing_zeros && (last_removed_digit == 5) && (vr % 2) == 0 {
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// Round even if the exact number is .....50..0.
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last_removed_digit = 4
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}
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out = vr
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// We need to take vr + 1 if vr is outside bounds
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// or we need to round up.
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if (vr == vm && (!accept_bounds || !vm_is_trailing_zeros)) || last_removed_digit >= 5 {
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out++
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}
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} else {
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// Specialized for the common case (~99.3%).
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// Percentages below are relative to this.
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mut round_up := false
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for vp / 100 > vm / 100 {
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// Optimization: remove two digits at a time (~86.2%).
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round_up = (vr % 100) >= 50
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vr /= 100
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vp /= 100
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vm /= 100
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removed += 2
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}
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// Loop iterations below (approximately), without optimization above:
|
||||
// 0: 0.03%, 1: 13.8%, 2: 70.6%, 3: 14.0%, 4: 1.40%, 5: 0.14%, 6+: 0.02%
|
||||
// Loop iterations below (approximately), with optimization above:
|
||||
// 0: 70.6%, 1: 27.8%, 2: 1.40%, 3: 0.14%, 4+: 0.02%
|
||||
for vp / 10 > vm / 10 {
|
||||
round_up = (vr % 10) >= 5
|
||||
vr /= 10
|
||||
vp /= 10
|
||||
vm /= 10
|
||||
removed++
|
||||
}
|
||||
// We need to take vr + 1 if vr is outside bounds
|
||||
// or we need to round up.
|
||||
out = vr + bool_to_u64(vr == vm || round_up)
|
||||
}
|
||||
|
||||
return Dec64{
|
||||
m: out
|
||||
e: e10 + removed
|
||||
}
|
||||
}
|
||||
|
||||
//=============================================================================
|
||||
// String Functions
|
||||
//=============================================================================
|
||||
|
||||
// f64_to_str return a string in scientific notation with max n_digit after the dot
|
||||
pub fn f64_to_str(f f64, n_digit int) string {
|
||||
u := math.f64_bits(f)
|
||||
neg := (u >> (mantbits64 + expbits64)) != 0
|
||||
mant := u & ((u64(1) << mantbits64) - u64(1))
|
||||
exp := (u >> mantbits64) & ((u64(1) << expbits64) - u64(1))
|
||||
// println("s:${neg} mant:${mant} exp:${exp} float:${f} byte:${u1.u:016lx}")
|
||||
|
||||
// Exit early for easy cases.
|
||||
if (exp == maxexp64) || (exp == 0 && mant == 0) {
|
||||
return get_string_special(neg, exp == 0, mant == 0)
|
||||
}
|
||||
|
||||
mut d, ok := f64_to_decimal_exact_int(mant, exp)
|
||||
if !ok {
|
||||
// println("to_decimal")
|
||||
d = f64_to_decimal(mant, exp)
|
||||
}
|
||||
// println("${d.m} ${d.e}")
|
||||
return d.get_string_64(neg, n_digit, 0)
|
||||
}
|
||||
|
|
@ -0,0 +1,37 @@
|
|||
module strconv
|
||||
|
||||
// pow of ten table used by n_digit reduction
|
||||
const (
|
||||
ten_pow_table_64 = [
|
||||
u64(1),
|
||||
u64(10),
|
||||
u64(100),
|
||||
u64(1000),
|
||||
u64(10000),
|
||||
u64(100000),
|
||||
u64(1000000),
|
||||
u64(10000000),
|
||||
u64(100000000),
|
||||
u64(1000000000),
|
||||
u64(10000000000),
|
||||
u64(100000000000),
|
||||
u64(1000000000000),
|
||||
u64(10000000000000),
|
||||
u64(100000000000000),
|
||||
u64(1000000000000000),
|
||||
u64(10000000000000000),
|
||||
u64(100000000000000000),
|
||||
u64(1000000000000000000),
|
||||
u64(10000000000000000000),
|
||||
]
|
||||
)
|
||||
|
||||
//=============================================================================
|
||||
// Conversion Functions
|
||||
//=============================================================================
|
||||
const (
|
||||
mantbits64 = u32(52)
|
||||
expbits64 = u32(11)
|
||||
bias64 = 1023 // f64 exponent bias
|
||||
maxexp64 = 2047
|
||||
)
|
||||
|
|
@ -86,7 +86,7 @@ pub fn format_dec_sb(d u64, p BF_param, mut res strings.Builder) {
|
|||
i--
|
||||
}
|
||||
|
||||
for j in 0 .. n_char {
|
||||
for _ in 0 .. n_char {
|
||||
i++
|
||||
res.write_b(buf[i])
|
||||
}
|
||||
|
|
|
|||
|
|
@ -15,12 +15,12 @@ fn (mut g JsGen) gen_plain_infix_expr(node ast.InfixExpr) {
|
|||
g.write('BigInt(')
|
||||
g.expr(node.left)
|
||||
g.gen_deref_ptr(node.left_type)
|
||||
g.write('.val)')
|
||||
g.write('.valueOf())')
|
||||
g.write(' $node.op.str() ')
|
||||
g.write('BigInt(')
|
||||
g.expr(node.right)
|
||||
g.gen_deref_ptr(node.left_type)
|
||||
g.write('.val)')
|
||||
g.write('.valueOf())')
|
||||
} else {
|
||||
g.expr(node.left)
|
||||
g.gen_deref_ptr(node.left_type)
|
||||
|
|
|
|||
|
|
@ -979,16 +979,8 @@ fn (mut g JsGen) expr(node ast.Expr) {
|
|||
}
|
||||
} else {
|
||||
g.write(node.op.str())
|
||||
|
||||
if node.op in [.inc, .dec] {
|
||||
g.expr(node.right)
|
||||
g.write('.val ')
|
||||
} else {
|
||||
g.write('(')
|
||||
g.expr(node.right)
|
||||
g.write('.valueOf()')
|
||||
g.write(')')
|
||||
}
|
||||
}
|
||||
}
|
||||
ast.RangeExpr {
|
||||
|
|
|
|||
Loading…
Reference in New Issue