23cb2a73ff
bigint.c (mpz_move): reduce copying of digits arrays.
2022-07-29 10:24:41 +09:00
de2ea3c389
bigint.c (udiv): avoid integer underflow.
2022-07-28 15:07:22 +09:00
25a32ed681
bigint.c (ulshift,urshift): check uzero before actual shifting.
...
Bit-shifting zero always result in zero.
2022-07-26 15:06:06 +09:00
97b9bfc4fa
bigint.c (mpz_init_set_str): move negative trick to mrb_bint_new_str().
...
It used to take negative base to generate negative value. But this weird
trick is now belong to the mruby API side.
2022-07-26 15:03:52 +09:00
26ce85bd5d
bigint.c (ucmp): fixed error with zero length zero value.
...
Big integers have two kind of zero values:
- digits in `p` array are all zeros
- length `sn` is zero
The old code crashed with the latter zero.
2022-07-26 00:13:15 +09:00
d2d105b589
bigint.c (mpz_get_int): should work with zero (i.e. y->p == NULL).
2022-07-25 14:54:41 +09:00
6a4c8e36b5
bigint.c (udiv): should trim remainder before bit shifting.
2022-07-25 14:54:41 +09:00
e02e9ae434
bigint.c (mpz_mmod): should call mpz_clear() for internal mpz_t.
2022-07-25 14:54:41 +09:00
7d5475916c
bigint.c (udiv): avoid out of bound access in division.
2022-07-25 14:54:40 +09:00
657263446e
bigint.c: cosmetic changes (add spaces, etc.)
2022-07-25 14:54:40 +09:00
199758c0b9
bigint.c (mpz_sizeinbase): should return size_t instead of int.
...
`int` may overflow.
2022-07-25 10:58:02 +09:00
e04184185a
bigint.c: heavy restructuring of big-integers.
...
Instead of splitting mp_limb by bit operations (using HIGH/LOW macros),
now we use mp_limb2 (which is bigger integer size, e.g uint64_t). It
makes operations (especially mulitiplication) a lot faster. As a side
effect, it also reduces memory consumption (16,452,033 -> 15,545,853 on
my Linux machine).
Other changes:
- trailing zeros are removed after operations.
- division algorithm is simplified.
2022-07-23 07:50:30 +09:00
c0a636c007
mruby-os-memsize/memsize.c: add up digit spaces for big-integers.
2022-07-21 20:56:32 +09:00
8bd1c56465
bigint.c (mpz_get_str): fixed wrong loop termination condition.
2022-07-21 20:40:35 +09:00
450382735b
bigint.c (mrb_bint_to_s): shortcut for bigint zero.
2022-07-20 14:40:45 +09:00
a4ce63abc5
bigint.c (mpz_sizeinbase): check zero length bigint.
2022-07-20 14:40:12 +09:00
cfea0c28a0
bigint.c (digits): check zero length bigint.
2022-07-20 14:39:05 +09:00
b84bca666f
bigint.c (mpz_get_int): avoid buffer overflow.
2022-07-19 18:20:28 +09:00
714e8a57af
bigint.c: avoid default allocation.
...
The digit space would be allocated on demand.
2022-07-19 00:52:54 +09:00
53f131d8f1
bigint.c: remove unnecessary break in for loop.
2022-07-16 12:26:08 +09:00
4f737b8afb
bigint.c: adjust integer types to remove warnings.
2022-07-15 18:37:45 +09:00
275684cf07
bigint.c: update header commend description.
2022-07-15 18:36:47 +09:00
30f6ad314d
bigint.c (mpz_get_str): stringify multiple digits at once.
...
Instead of dividing by 10, 10000 (32 bit) or 100000000 (64 bit), for
example (Karatsuba method?).
2022-07-15 13:45:17 +09:00
d9e0f3328b
bigint.c (mpz_get_str): avoid bigint division for performance.
2022-07-15 13:45:17 +09:00
3ebb55b75f
bigint.c (mrb_bint_copy): allow dup operation for bigints.
2022-07-11 11:02:27 +09:00
95610a292b
bigint.c (lzb): use __builtin_clz() if available.
2022-07-11 08:01:52 +09:00
3046440b5a
bigint.c (mpz_set_int): remove an unused local variable.
2022-07-11 08:01:18 +09:00
04b153a3b1
bigint.c (mpz_init_set_int): unified with mpz_set_int().
2022-07-10 08:06:55 +09:00
84d73ba6e8
bigint.c: small refactoring (removing extra lines and spaces).
2022-07-09 19:33:39 +09:00
e157a84418
bigint.c (mpz_init_set_int): should avoid integer overflow.
...
Check MRB_INT_MIN which could overflow by negation.
2022-07-09 17:27:27 +09:00
f1275803c9
bigint.c (mpz_set): simplify memory reallocation code.
2022-07-09 14:36:17 +09:00
a40842eb73
bigint.c (udiv): use (signed) int for loop counters.
...
Sometimes (xd-yd) may be negative and should be checked.
2022-07-09 10:56:02 +09:00
a64d2bfbe6
bigint.c (mpz_mul,mpz_mdiv): return early on zero.
2022-07-09 10:47:23 +09:00
23611332d9
Introduced mrb_static_assert_object_size()
...
Asserts the size of the object structure is less than or equal to 6 words.
2022-05-28 11:08:27 +09:00
118ff0a529
Merge branch 'bigint-gem' of https://github.com/dearblue/mruby into dearblue-bigint-gem
2022-04-25 11:03:39 +09:00
cc3a213fef
Move bigint implementation files to mruby-bigint
...
Users can now switch to their own implementation of GEM.
However, we do not guarantee that this will not be a problem in the current situation.
This may need to be improved in the future.
2022-04-23 21:19:12 +09:00
55b526167b
test/bigint.rb: add test for multi-precision integers.
2022-04-09 17:16:11 +09:00
dcaf4083d5
src/bigint.c: implement multi-precision integer.
...
To enable multi-precision integer support, you need to link
`mruby-bigint` mrbgem. The gem itself is empty but it turns on
the "bigint" support.
2022-04-09 17:16:10 +09:00
Yukihiro "Matz" Matsumoto