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dtoa fix for minus zero

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This commit is contained in:
Fabrice Bellard 2025-04-21 15:33:47 +02:00
parent 37cde16ba2
commit dbbca3dbf3
2 changed files with 6 additions and 11 deletions
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16
dtoa.c
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@ -1147,6 +1147,9 @@ int js_dtoa(char *buf, double d, int radix, int n_digits, int flags,
P = n_digits + 1;
else
P = n_digits;
/* "-0" is displayed as "0" if JS_DTOA_MINUS_ZERO is not present */
if (sgn && (flags & JS_DTOA_MINUS_ZERO))
*q++ = '-';
goto output;
}
/* denormal number: convert to a normal number */
@ -1156,6 +1159,8 @@ int js_dtoa(char *buf, double d, int radix, int n_digits, int flags,
} else {
m |= (uint64_t)1 << 52;
}
if (sgn)
*q++ = '-';
/* remove the bias */
e -= 1022;
/* d = 2^(e-53)*m */
@ -1167,8 +1172,6 @@ int js_dtoa(char *buf, double d, int radix, int n_digits, int flags,
(flags & JS_DTOA_EXP_MASK) != JS_DTOA_EXP_ENABLED) {
m >>= 53 - e;
/* 'm' is never zero */
if (sgn)
*q++ = '-';
q += u64toa_radix(q, m, radix);
goto done;
}
@ -1244,10 +1247,6 @@ int js_dtoa(char *buf, double d, int radix, int n_digits, int flags,
/* frac is rounded using RNDNA */
mul_pow_round(tmp1, m, e - 53, radix1, radix_shift, n_digits, JS_RNDNA);
/* "-0" is displayed as "0" */
if (sgn && !(tmp1->tab[0] == 0 && tmp1->len == 1)) {
*q++ = '-';
}
/* we add one extra digit on the left and remove it if needed
to avoid testing if the result is < radix^P */
len = output_digits(q, tmp1, radix, max_int(E + 1, 1) + n_digits,
@ -1277,11 +1276,6 @@ int js_dtoa(char *buf, double d, int radix, int n_digits, int flags,
}
}
output:
/* "-0" is displayed as "0" if JS_DTOA_MINUS_ZERO is not present */
if (sgn && ((flags & JS_DTOA_MINUS_ZERO) ||
!(tmp1->tab[0] == 0 && tmp1->len == 1))) {
*q++ = '-';
}
if (fmt == JS_DTOA_FORMAT_FIXED)
E_max = n_digits;
else

1
tests/test_builtin.js
View File

@ -393,6 +393,7 @@ function test_number()
assert((-1.125).toFixed(2), "-1.13");
assert((0.5).toFixed(0), "1");
assert((-0.5).toFixed(0), "-1");
assert((-1e-10).toFixed(0), "-0");
assert((1.3).toString(7), "1.2046204620462046205");
assert((1.3).toString(35), "1.ahhhhhhhhhm");