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fixed js_bigint_to_string1() (#412)

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Fabrice Bellard 2025-05-29 20:01:24 +02:00
parent bb986e55ff
commit 638ec8ca5e
1 changed files with 10 additions and 1 deletions
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11
quickjs.c
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@ -10563,6 +10563,15 @@ static inline js_limb_t js_limb_clz(js_limb_t a)
} }
#endif #endif
/* handle a = 0 too */
static inline js_limb_t js_limb_safe_clz(js_limb_t a)
{
if (a == 0)
return JS_LIMB_BITS;
else
return js_limb_clz(a);
}
static js_limb_t mp_add(js_limb_t *res, const js_limb_t *op1, const js_limb_t *op2, static js_limb_t mp_add(js_limb_t *res, const js_limb_t *op1, const js_limb_t *op2,
js_limb_t n, js_limb_t carry) js_limb_t n, js_limb_t carry)
{ {
@ -11911,7 +11920,7 @@ static JSValue js_bigint_to_string1(JSContext *ctx, JSValueConst val, int radix)
r = tmp; r = tmp;
} }
log2_radix = 31 - clz32(radix); /* floor(log2(radix)) */ log2_radix = 31 - clz32(radix); /* floor(log2(radix)) */
n_bits = r->len * JS_LIMB_BITS - js_limb_clz(r->tab[r->len - 1]); n_bits = r->len * JS_LIMB_BITS - js_limb_safe_clz(r->tab[r->len - 1]);
/* n_digits is exact only if radix is a power of /* n_digits is exact only if radix is a power of
two. Otherwise it is >= the exact number of digits */ two. Otherwise it is >= the exact number of digits */
n_digits = (n_bits + log2_radix - 1) / log2_radix; n_digits = (n_bits + log2_radix - 1) / log2_radix;