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uclibc-compat: fix __aeabi_d2iz infinite recursion #2002

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Merged
widgetii merged 1 commit into from
Apr 13, 2026
Merged

uclibc-compat: fix __aeabi_d2iz infinite recursion #2002

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18 changes: 16 additions & 2 deletions general/package/uclibc-compat/src/uclibc-compat.c
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Original file line number Diff line number Diff line change
Expand Up @@ -134,11 +134,25 @@ size_t _stdlib_mb_cur_max(void)
return 1;
}

/* __aeabi_d2iz -- ARM EABI double-to-int, missing from musl */
/* __aeabi_d2iz -- ARM EABI double-to-int, missing from musl.
* Cannot use C cast (int)x because GCC emits __aeabi_d2iz for it,
* causing infinite recursion. Implement the conversion manually
* by extracting the IEEE 754 double fields. */
__attribute__((visibility("default")))
int __aeabi_d2iz(double x)
{
return (int)x;
union { double d; unsigned long long u; } u = { .d = x };
int sign = (u.u >> 63) ? -1 : 1;
int exp = ((u.u >> 52) & 0x7FF) - 1023;
if (exp < 0) return 0;
if (exp > 30) return sign > 0 ? 0x7FFFFFFF : (int)0x80000000;
unsigned long long mantissa = (u.u & 0x000FFFFFFFFFFFFFULL) | 0x0010000000000000ULL;
int result;
if (exp >= 52)
result = (int)(mantissa << (exp - 52));
else
result = (int)(mantissa >> (52 - exp));
return sign * result;
}

/* ======================================================================
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