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ext/bcmath: use vector in compare #18859

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ext/bcmath: use vector in compare #18859

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32 changes: 32 additions & 0 deletions ext/bcmath/libbcmath/src/compare.c
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Original file line number Diff line number Diff line change
Expand Up @@ -92,6 +92,38 @@ bcmath_compare_result _bc_do_compare(bc_num n1, bc_num n2, size_t scale, bool us
const char *n1ptr = n1->n_value;
const char *n2ptr = n2->n_value;

while (count >= sizeof(BC_VECTOR)) {
BC_VECTOR n1bytes;
BC_VECTOR n2bytes;
memcpy(&n1bytes, n1ptr, sizeof(BC_VECTOR));
memcpy(&n2bytes, n2ptr, sizeof(BC_VECTOR));

if (n1bytes != n2bytes) {
#if BC_LITTLE_ENDIAN
n1bytes = BC_BSWAP(n1bytes);
n2bytes = BC_BSWAP(n2bytes);
#endif
if (n1bytes > n2bytes) {
/* Magnitude of n1 > n2. */
if (!use_sign || n1->n_sign == PLUS) {
return BCMATH_LEFT_GREATER;
} else {
return BCMATH_RIGHT_GREATER;
}
} else {
/* Magnitude of n1 < n2. */
if (!use_sign || n1->n_sign == PLUS) {
return BCMATH_RIGHT_GREATER;
} else {
return BCMATH_LEFT_GREATER;
}
}
}
count -= sizeof(BC_VECTOR);
n1ptr += sizeof(BC_VECTOR);
n2ptr += sizeof(BC_VECTOR);
}

while ((count > 0) && (*n1ptr == *n2ptr)) {
n1ptr++;
n2ptr++;
Expand Down