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ext/bcmath: optimized divmod() and mod() take 2 #18058

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ext/bcmath: optimized divmod() and mod() take 2 #18058

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03955d6
Added `bc_divide_copy_numerator()`
SakiTakamachi Mar 14, 2025
aaf1f6a
At the end of the calculation, set the value of `numerator_vectors` t…
SakiTakamachi Mar 14, 2025
b2c1b3f
Changed `bc_divide` to `bc_divide_ex`, and changed three division fun…
SakiTakamachi Mar 14, 2025
c0000cd
Set the sign of `quot` efficiently
SakiTakamachi Mar 14, 2025
0865562
Use `quot` only if `use_quot == true`, in `bc_divide_ex`
SakiTakamachi Mar 14, 2025
5e4b175
Added `bc_convert_vector_to_char()` and `bc_convert_vector_to_char_wi…
SakiTakamachi Mar 14, 2025
13a98ae
Use `quot` only if `use_quot == true`, in other funcs
SakiTakamachi Mar 14, 2025
b949c5e
Roughly write code using `use_rem`
SakiTakamachi Mar 14, 2025
484d9df
Using `rem` in `bc_divide_by_one`
SakiTakamachi Mar 14, 2025
2d63079
Create a process to initialize `bc_num` of `rem`
SakiTakamachi Mar 14, 2025
c7916b5
Using `rem` in `bc_divide_by_pow_10`
SakiTakamachi Mar 14, 2025
a2ba77c
Using `rem` in `bc_do_div`
SakiTakamachi Mar 14, 2025
d3a5713
fixed raisemod
SakiTakamachi Mar 14, 2025
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11 changes: 4 additions & 7 deletions ext/bcmath/libbcmath/src/div.c
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Original file line number Diff line number Diff line change
Expand Up @@ -309,9 +309,10 @@ static inline void bc_divide_copy_numerator(bc_num numerator, bc_num *num, size_
memcpy((*num)->n_value, numerator->n_value, numerator->n_len + scale);
}

static inline void bc_divide_by_one(bc_num numerator, bc_num *quot, size_t quot_scale)
static inline void bc_divide_by_one(bc_num numerator, bc_num divisor, bc_num *quot, size_t quot_scale)
{
bc_divide_copy_numerator(numerator, quot, quot_scale);
(*quot)->n_sign = numerator->n_sign == divisor->n_sign ? PLUS : MINUS;
}

static inline void bc_divide_by_pow_10(
Expand Down Expand Up @@ -355,8 +356,7 @@ bool bc_divide_ex(bc_num numerator, bc_num divisor, bc_num *quot, bc_num *rem, s

/* If divisor is 1 / -1, the quotient's n_value is equal to numerator's n_value. */
if (_bc_do_compare(divisor, BCG(_one_), divisor->n_scale, false) == BCMATH_EQUAL) {
bc_divide_by_one(numerator, quot, quot_scale);
(*quot)->n_sign = numerator->n_sign == divisor->n_sign ? PLUS : MINUS;
bc_divide_by_one(numerator, divisor, quot, quot_scale);
return true;
}

Expand Down Expand Up @@ -404,14 +404,14 @@ bool bc_divide_ex(bc_num numerator, bc_num divisor, bc_num *quot, bc_num *rem, s
} else {
*quot = bc_new_num_nonzeroed(1, quot_scale); /* 1 is for 0 */
}
(*quot)->n_sign = numerator->n_sign == divisor->n_sign ? PLUS : MINUS;

/* Size that can be read from numeratorptr */
size_t numerator_readable_size = numerator->n_len + numerator->n_scale - numerator_leading_zeros;

/* If divisor is 1 here, return the result of adjusting the decimal point position of numerator. */
if (divisor_size == 1 && *divisorptr == 1) {
bc_divide_by_pow_10(numeratorptr, numerator_readable_size, quot, quot_size, quot_scale);
(*quot)->n_sign = numerator->n_sign == divisor->n_sign ? PLUS : MINUS;
return true;
}

Expand All @@ -425,9 +425,6 @@ bool bc_divide_ex(bc_num numerator, bc_num divisor, bc_num *quot, bc_num *rem, s
_bc_rm_leading_zeros(*quot);
if (bc_is_zero(*quot)) {
(*quot)->n_sign = PLUS;
(*quot)->n_scale = 0;
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You no longer reset the scale in this case, but you only removed the leading zeros (on line 425) and not the trailing zeros. Can you explain please?
} else {
(*quot)->n_sign = numerator->n_sign == divisor->n_sign ? PLUS : MINUS;
}
return true;

Expand Down