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bc: add comment about BC_NUM_DEF_SIZE

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-12-06 12:34:39 +01:00
parent 1ff8862149
commit 2fa11b6d35
1 changed files with 12 additions and 11 deletions
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23
miscutils/bc.c
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@ -205,9 +205,6 @@ typedef struct BcVec {
BcVecFree dtor;
} BcVec;
#define bc_vec_pop(v) (bc_vec_npop((v), 1))
#define bc_vec_top(v) (bc_vec_item_rev((v), 0))
typedef signed char BcDig;
typedef struct BcNum {
@ -218,16 +215,17 @@ typedef struct BcNum {
bool neg;
} BcNum;
#define BC_NUM_MIN_BASE ((unsigned long) 2)
#define BC_NUM_MAX_IBASE ((unsigned long) 16)
#define BC_NUM_DEF_SIZE (16)
#define BC_NUM_PRINT_WIDTH (69)
#define BC_NUM_MIN_BASE ((unsigned long) 2)
#define BC_NUM_MAX_IBASE ((unsigned long) 16)
// larger value might speed up BIGNUM calculations a bit:
#define BC_NUM_DEF_SIZE (16)
#define BC_NUM_PRINT_WIDTH (69)
#define BC_NUM_KARATSUBA_LEN (32)
#define BC_NUM_KARATSUBA_LEN (32)
#define BC_NUM_NEG(n, neg) ((((ssize_t)(n)) ^ -((ssize_t)(neg))) + (neg))
#define BC_NUM_ONE(n) ((n)->len == 1 && (n)->rdx == 0 && (n)->num[0] == 1)
#define BC_NUM_INT(n) ((n)->len - (n)->rdx)
#define BC_NUM_NEG(n, neg) ((((ssize_t)(n)) ^ -((ssize_t)(neg))) + (neg))
#define BC_NUM_ONE(n) ((n)->len == 1 && (n)->rdx == 0 && (n)->num[0] == 1)
#define BC_NUM_INT(n) ((n)->len - (n)->rdx)
#define BC_NUM_AREQ(a, b) \
(BC_MAX((a)->rdx, (b)->rdx) + BC_MAX(BC_NUM_INT(a), BC_NUM_INT(b)) + 1)
#define BC_NUM_MREQ(a, b, scale) \
@ -1078,6 +1076,9 @@ static void bc_vec_expand(BcVec *v, size_t req)
}
}
#define bc_vec_pop(v) (bc_vec_npop((v), 1))
#define bc_vec_top(v) (bc_vec_item_rev((v), 0))
static void bc_vec_npop(BcVec *v, size_t n)
{
if (!v->dtor)