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fixed a bug in bigint division

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hyung-hwan 2019-02-20 17:38:56 +00:00
parent b39ce631b3
commit 2b14218a43
1 changed files with 41 additions and 3 deletions
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44
lib/bigint.c
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@ -710,11 +710,24 @@ static HCL_INLINE int is_greater (hcl_t* hcl, hcl_oop_t x, hcl_oop_t y)
} }
} }
static HCL_INLINE int is_equal_unsigned_array (const hcl_liw_t* x, hcl_oow_t xs, const hcl_liw_t* y, hcl_oow_t ys)
{
return xs == ys && HCL_MEMCMP(x, y, xs * HCL_SIZEOF(*x)) == 0;
}
static HCL_INLINE int is_equal_unsigned (hcl_oop_t x, hcl_oop_t y)
{
return is_equal_unsigned_array(
((hcl_oop_liword_t)x)->slot, HCL_OBJ_GET_SIZE(x),
((hcl_oop_liword_t)y)->slot, HCL_OBJ_GET_SIZE(y));
}
static HCL_INLINE int is_equal (hcl_t* hcl, hcl_oop_t x, hcl_oop_t y) static HCL_INLINE int is_equal (hcl_t* hcl, hcl_oop_t x, hcl_oop_t y)
{ {
/* check if two large integers are equal to each other */ /* check if two large integers are equal to each other */
return HCL_OBJ_GET_FLAGS_BRAND(x) == HCL_OBJ_GET_FLAGS_BRAND(y) && HCL_OBJ_GET_SIZE(x) == HCL_OBJ_GET_SIZE(y) && /*return HCL_OBJ_GET_FLAGS_BRAND(x) == HCL_OBJ_GET_FLAGS_BRAND(y) && HCL_OBJ_GET_SIZE(x) == HCL_OBJ_GET_SIZE(y) &&
HCL_MEMCMP(((hcl_oop_liword_t)x)->slot, ((hcl_oop_liword_t)y)->slot, HCL_OBJ_GET_SIZE(x) * HCL_SIZEOF(hcl_liw_t)) == 0; HCL_MEMCMP(((hcl_oop_liword_t)x)->slot, ((hcl_oop_liword_t)y)->slot, HCL_OBJ_GET_SIZE(x) * HCL_SIZEOF(hcl_liw_t)) == 0;*/
return HCL_OBJ_GET_FLAGS_BRAND(x) == HCL_OBJ_GET_FLAGS_BRAND(y) && HCL_OBJ_GET_SIZE(x) == HCL_OBJ_GET_SIZE(y) && is_equal_unsigned(x, y);
} }
static void complement2_unsigned_array (hcl_t* hcl, const hcl_liw_t* x, hcl_oow_t xs, hcl_liw_t* z) static void complement2_unsigned_array (hcl_t* hcl, const hcl_liw_t* x, hcl_oow_t xs, hcl_liw_t* z)
@ -1535,8 +1548,33 @@ static hcl_oop_t divide_unsigned_integers (hcl_t* hcl, hcl_oop_t x, hcl_oop_t y,
{ {
hcl_oop_t qq, rr; hcl_oop_t qq, rr;
if (is_less_unsigned(x, y))
{
rr = clone_bigint(hcl, x, HCL_OBJ_GET_SIZE(x));
if (!rr) return HCL_NULL;
hcl_pushtmp (hcl, &rr);
qq = make_bigint_with_ooi(hcl, 0); /* TODO: inefficient. no need to create a bigint object for zero. */
hcl_poptmp (hcl);
if (qq) *r = rr;
return qq;
}
else if (is_equal_unsigned(x, y))
{
rr = make_bigint_with_ooi(hcl, 0); /* TODO: inefficient. no need to create a bigint object for zero. */
if (!rr) return HCL_NULL;
hcl_pushtmp (hcl, &rr);
qq = make_bigint_with_ooi(hcl, 1); /* TODO: inefficient. no need to create a bigint object for zero. */
hcl_poptmp (hcl);
if (qq) *r = rr;
return qq;
}
/* the caller must ensure that x >= y */ /* the caller must ensure that x >= y */
HCL_ASSERT (hcl, !is_less_unsigned (x, y)); HCL_ASSERT (hcl, !is_less_unsigned(x, y));
hcl_pushtmp (hcl, &x); hcl_pushtmp (hcl, &x);
hcl_pushtmp (hcl, &y); hcl_pushtmp (hcl, &y);
qq = hcl_makebigint(hcl, HCL_BRAND_PBIGINT, HCL_NULL, HCL_OBJ_GET_SIZE(x)); qq = hcl_makebigint(hcl, HCL_BRAND_PBIGINT, HCL_NULL, HCL_OBJ_GET_SIZE(x));