Improve Number.prototype.toString for radix other than 10 (#284)
- fix the conversions for integers and exact fractions - approximate approach for other cases. - bypass floating point conversions for JS_TAG_INT values - avoid divisions for base 10 integer conversions Fixes: https://github.com/quickjs-ng/quickjs/issues/242
This commit is contained in:
Charlie Gordon
GitHub
parent
ec4f957ca1
commit
7dd2868856
2 changed files with 98 additions and 113 deletions
99
quickjs.c
99
quickjs.c
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@ -10971,6 +10971,8 @@ static JSValue js_bigint_to_string(JSContext *ctx, JSValue val)
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}
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/* 2 <= base <= 36 */
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static char const digits[36] = "0123456789abcdefghijklmnopqrstuvwxyz";
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static char *i64toa(char *buf_end, int64_t n, unsigned int base)
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{
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char *q = buf_end;
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@ -10982,15 +10984,20 @@ static char *i64toa(char *buf_end, int64_t n, unsigned int base)
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n = -n;
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}
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*--q = '\0';
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if (base == 10) {
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/* division by known base uses multiplication */
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do {
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digit = (uint64_t)n % 10;
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n = (uint64_t)n / 10;
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*--q = '0' + digit;
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} while (n != 0);
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} else {
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do {
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digit = (uint64_t)n % base;
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n = (uint64_t)n / base;
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if (digit < 10)
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digit += '0';
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else
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digit += 'a' - 10;
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*--q = digit;
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*--q = digits[digit];
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} while (n != 0);
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}
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if (is_neg)
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*--q = '-';
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return q;
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@ -11238,6 +11245,80 @@ static JSValue js_dtoa(JSContext *ctx,
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return JS_NewString(ctx, buf);
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}
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static JSValue js_dtoa_radix(JSContext *ctx, double d, int radix)
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{
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char buf[2200], *ptr, *ptr2;
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/* d is finite */
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int sign = d < 0;
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int digit;
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double frac, d0;
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int64_t n0 = 0;
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d = fabs(d);
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d0 = trunc(d);
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frac = d - d0;
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ptr = buf + 1100;
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*ptr = '\0';
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if (d0 <= MAX_SAFE_INTEGER) {
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int64_t n = n0 = (int64_t)d0;
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while (n >= radix) {
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digit = n % radix;
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n = n / radix;
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*--ptr = digits[digit];
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}
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*--ptr = digits[(int)n];
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} else {
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/* no decimals */
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while (d0 >= radix) {
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digit = fmod(d0, radix);
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d0 = trunc(d0 / radix);
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if (d0 >= MAX_SAFE_INTEGER)
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digit = 0;
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*--ptr = digits[digit];
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}
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*--ptr = digits[(int)d0];
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goto done;
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}
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if (frac != 0) {
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double log2_radix = log2(radix);
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double prec = 1023 + 51; // handle subnormals
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ptr2 = buf + 1100;
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*ptr2++ = '.';
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while (frac != 0 && n0 <= MAX_SAFE_INTEGER/2 && prec > 0) {
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frac *= radix;
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digit = trunc(frac);
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frac -= digit;
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*ptr2++ = digits[digit];
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n0 = n0 * radix + digit;
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prec -= log2_radix;
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}
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*ptr2 = '\0';
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if (frac * radix >= radix / 2) {
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char nine = digits[radix - 1];
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// round to closest
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while (ptr2[-1] == nine)
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*--ptr2 = '\0';
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if (ptr2[-1] == '.') {
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*--ptr2 = '\0';
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while (ptr2[-1] == nine)
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*--ptr2 = '0';
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}
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if (ptr2 - 1 == ptr)
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*--ptr = '1';
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else
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ptr2[-1] += 1;
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} else {
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while (ptr2[-1] == '0')
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*--ptr2 = '\0';
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if (ptr2[-1] == '.')
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*--ptr2 = '\0';
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}
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}
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done:
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ptr[-1] = '-';
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ptr -= sign;
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return JS_NewString(ctx, ptr);
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}
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JSValue JS_ToStringInternal(JSContext *ctx, JSValue val, BOOL is_ToPropertyKey)
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{
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uint32_t tag;
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@ -38557,8 +38638,16 @@ static JSValue js_number_toString(JSContext *ctx, JSValue this_val,
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if (base < 0)
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goto fail;
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}
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if (JS_VALUE_GET_TAG(val) == JS_TAG_INT) {
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char buf1[70], *ptr;
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ptr = i64toa(buf1 + sizeof(buf1), JS_VALUE_GET_INT(val), base);
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return JS_NewString(ctx, ptr);
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}
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if (JS_ToFloat64Free(ctx, &d, val))
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return JS_EXCEPTION;
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if (base != 10 && isfinite(d)) {
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return js_dtoa_radix(ctx, d, base);
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}
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return js_dtoa(ctx, d, base, 0, JS_DTOA_VAR_FORMAT);
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fail:
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JS_FreeValue(ctx, val);
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104
v8.txt
104
v8.txt
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@ -799,113 +799,9 @@ Failure: expected <true> found <false>
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=== number-string-index-call.js
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=== number-tostring-add.js
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=== number-tostring-big-integer.js
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Failure:
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expected:
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"314404114120101444444424000000000000000"
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found:
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"1.2345e+27"
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=== number-tostring-func.js
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Failure: expected <"5a.1eb851eb852"> found <"90.12">
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Failure: expected <"0.1999999999999a"> found <"0.1">
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Failure: expected <"0.028f5c28f5c28f6"> found <"0.01">
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Failure: expected <"0.032617c1bda511a"> found <"0.0123">
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Failure: expected <"605f9f6dd18bc8000"> found <"111111111111111110000">
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Failure: expected <"3c3bc3a4a2f75c0000"> found <"1.1111111111111111e+21">
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Failure: expected <"25a55a46e5da9a00000"> found <"1.1111111111111111e+22">
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Failure: expected <"0.0000a7c5ac471b4788"> found <"0.00001">
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Failure: expected <"0.000010c6f7a0b5ed8d"> found <"0.000001">
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Failure: expected <"0.000001ad7f29abcaf48"> found <"1e-7">
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Failure: expected <"0.000002036565348d256"> found <"1.2e-7">
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Failure: expected <"0.0000021047ee22aa466"> found <"1.23e-7">
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Failure: expected <"0.0000002af31dc4611874"> found <"1e-8">
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Failure: expected <"0.000000338a23b87483be"> found <"1.2e-8">
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Failure: expected <"0.00000034d3fe36aaa0a2"> found <"1.23e-8">
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Failure: expected <"-5a.1eb851eb852"> found <"-90.12">
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Failure: expected <"-0.1999999999999a"> found <"-0.1">
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Failure: expected <"-0.028f5c28f5c28f6"> found <"-0.01">
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Failure: expected <"-0.032617c1bda511a"> found <"-0.0123">
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Failure: expected <"-605f9f6dd18bc8000"> found <"-111111111111111110000">
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Failure: expected <"-3c3bc3a4a2f75c0000"> found <"-1.1111111111111111e+21">
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Failure: expected <"-25a55a46e5da9a00000"> found <"-1.1111111111111111e+22">
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Failure: expected <"-0.0000a7c5ac471b4788"> found <"-0.00001">
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Failure: expected <"-0.000010c6f7a0b5ed8d"> found <"-0.000001">
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Failure: expected <"-0.000001ad7f29abcaf48"> found <"-1e-7">
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Failure: expected <"-0.000002036565348d256"> found <"-1.2e-7">
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Failure: expected <"-0.0000021047ee22aa466"> found <"-1.23e-7">
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Failure: expected <"-0.0000002af31dc4611874"> found <"-1e-8">
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Failure: expected <"-0.000000338a23b87483be"> found <"-1.2e-8">
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Failure: expected <"-0.00000034d3fe36aaa0a2"> found <"-1.23e-8">
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Failure: expected <"100000000000080"> found <"72057594037928060">
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Failure: expected <"1000000000000100"> found <"1152921504606847200">
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Failure: expected <"1000000000000000"> found <"1152921504606847000">
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Failure: expected <"1000000000000000"> found <"1152921504606847000">
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Failure:
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expected:
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"100000000000000000000000000000000000000000000000010000000"
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found:
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"72057594037928060"
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Failure: expected <"-100000000000080"> found <"-72057594037928060">
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Failure:
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expected:
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"-100000000000000000000000000000000000000000000000010000000"
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found:
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"-72057594037928060"
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Failure: expected <"8.8"> found <"8.5">
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Failure: expected <"-8.8"> found <"-8.5">
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=== number-tostring-small.js
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=== number-tostring.js
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Failure: expected <"5a.1eb851eb852"> found <"90.12">
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Failure: expected <"0.1999999999999a"> found <"0.1">
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Failure: expected <"0.028f5c28f5c28f6"> found <"0.01">
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Failure: expected <"0.032617c1bda511a"> found <"0.0123">
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Failure: expected <"605f9f6dd18bc8000"> found <"111111111111111110000">
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Failure: expected <"3c3bc3a4a2f75c0000"> found <"1.1111111111111111e+21">
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Failure: expected <"25a55a46e5da9a00000"> found <"1.1111111111111111e+22">
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Failure: expected <"0.0000a7c5ac471b4788"> found <"0.00001">
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Failure: expected <"0.000010c6f7a0b5ed8d"> found <"0.000001">
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Failure: expected <"0.000001ad7f29abcaf48"> found <"1e-7">
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Failure: expected <"0.000002036565348d256"> found <"1.2e-7">
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Failure: expected <"0.0000021047ee22aa466"> found <"1.23e-7">
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Failure: expected <"0.0000002af31dc4611874"> found <"1e-8">
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Failure: expected <"0.000000338a23b87483be"> found <"1.2e-8">
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Failure: expected <"0.00000034d3fe36aaa0a2"> found <"1.23e-8">
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Failure: expected <"-5a.1eb851eb852"> found <"-90.12">
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Failure: expected <"-0.1999999999999a"> found <"-0.1">
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Failure: expected <"-0.028f5c28f5c28f6"> found <"-0.01">
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Failure: expected <"-0.032617c1bda511a"> found <"-0.0123">
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Failure: expected <"-605f9f6dd18bc8000"> found <"-111111111111111110000">
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Failure: expected <"-3c3bc3a4a2f75c0000"> found <"-1.1111111111111111e+21">
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Failure: expected <"-25a55a46e5da9a00000"> found <"-1.1111111111111111e+22">
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Failure: expected <"-0.0000a7c5ac471b4788"> found <"-0.00001">
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Failure: expected <"-0.000010c6f7a0b5ed8d"> found <"-0.000001">
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Failure: expected <"-0.000001ad7f29abcaf48"> found <"-1e-7">
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Failure: expected <"-0.000002036565348d256"> found <"-1.2e-7">
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Failure: expected <"-0.0000021047ee22aa466"> found <"-1.23e-7">
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Failure: expected <"-0.0000002af31dc4611874"> found <"-1e-8">
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Failure: expected <"-0.000000338a23b87483be"> found <"-1.2e-8">
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Failure: expected <"-0.00000034d3fe36aaa0a2"> found <"-1.23e-8">
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Failure: expected <"100000000000080"> found <"72057594037928060">
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Failure: expected <"1000000000000100"> found <"1152921504606847200">
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Failure: expected <"1000000000000000"> found <"1152921504606847000">
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Failure: expected <"1000000000000000"> found <"1152921504606847000">
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Failure:
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expected:
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"100000000000000000000000000000000000000000000000010000000"
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found:
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"72057594037928060"
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Failure: expected <"-100000000000080"> found <"-72057594037928060">
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Failure:
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expected:
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"-100000000000000000000000000000000000000000000000010000000"
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found:
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"-72057594037928060"
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Failure: expected <"8.8"> found <"8.5">
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Failure: expected <"-8.8"> found <"-8.5">
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Failure: expected <"1.1"> found <"1.3333333333333333">
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Failure: expected <"11.1"> found <"4.333333333333333">
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Failure: expected <"0.01"> found <"0.1111111111111111">
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Failure: expected <"10000.01"> found <"81.11111111111111">
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Failure: expected <"0.0212010212010212010212010212010212"> found <"0.2857142857142857">
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=== numops-fuzz-part1.js
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=== numops-fuzz-part2.js
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=== numops-fuzz-part3.js
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