Commit Graph

122 Commits

Author SHA1 Message Date
mratsim ee02de16fd Fix one, it impacted signed int negation and uint division (why was it not catched?). Signed int pass the full test suite 2018-04-25 21:58:10 +02:00
mratsim 37ebd13dd4 Implement add, sub, neg with proper overflow detection 2018-04-25 21:21:58 +02:00
mratsim d690923310 Update Stint in header + mention unsigned vs signed int in tests 2018-04-25 21:21:25 +02:00
mratsim 0296b5eca9 Add sub, proper negate bound checking, high and low, most significant word mutation 2018-04-25 19:51:14 +02:00
mratsim 8b412b879d Add tests for negative numbers 2018-04-25 17:58:55 +02:00
mratsim b34019c0b5 Add signed initialization, bitwise ops, addition, negation 2018-04-25 17:50:53 +02:00
mratsim e2ab2dbf59 Add signed word iteration 2018-04-25 17:02:44 +02:00
mratsim 97fbe56353 Add most significant bit and isNegative proc 2018-04-25 15:41:59 +02:00
mratsim b3dedf7824 Split initialization and conversion proc 2018-04-25 14:43:24 +02:00
mratsim 40c2215804 Add the IntImpl type. Rename uint_type to datatypes 2018-04-25 14:27:55 +02:00
mratsim f189d13b42 Prefix repo with nim 2018-04-25 14:08:31 +02:00
mratsim 00a634d2f2 Don't use single letter function like u(256) 2018-04-25 13:36:56 +02:00
Mamy Ratsimbazafy 102a1b0f0c
Rename the library to Stint (#26) 2018-04-25 12:52:00 +02:00
mratsim 52a1849075 Add (deactivated) test vs ttmath 2018-04-24 19:07:22 +02:00
mratsim d0606a338f fix travis / nimble version 2018-04-24 18:40:41 +02:00
mratsim 0987af4467 Fix #25 (binary shift change from bit_length to clz). Div/mod is now correct. Full test suite is passing 2018-04-24 18:18:36 +02:00
mratsim 0dc0b82220 Fix https://github.com/status-im/nim-mpint/issues/23 shr and shl max limit triggering undefined behaviour 2018-04-24 17:21:16 +02:00
Mamy Ratsimbazafy bfa8393878
Add property based testing (#24)
* Add property-based testing

* Reorder by testing what is most dependant (likely to go wrong) later

* Update with quickcheck support of uint: https://github.com/alehander42/nim-quicktest/issues/2

* parametrize itercount

* Add debug and release test to property testing see aliasing: https://github.com/status-im/nim-mpint/issues/23

* move `*` up as less likely to fail
2018-04-24 16:52:13 +02:00
Mamy Ratsimbazafy d5794ffbe1
Use word iteration for bitwise op (#22) + 10% perf improvement.
* Try with iterator (failing)

* Type resolution in macro for generic return values in iterators is broken ...

* Use iterators for bit operations. Optimize MpUint initialization

* Fix add_sub
2018-04-21 17:21:14 +02:00
mratsim 4ed4252af2 Use iterator for word size iteration. 2018-04-21 13:50:43 +02:00
Mamy Ratsimbazafy a2220617a0
update benchmark result 2018-04-21 12:16:26 +02:00
Mamy Ratsimbazafy 1749e0e575
[WIP] Division and multiplication optimization (#21)
* Clean-up code, part 1

* Managed to get best borrow code for the not inlined substraction #10

* Implement in place substraction in terms of substraction #10

* Another unneed proc removal/temporary step

* more cleanup

* Upgrade benchmark to Uint256

* Special case when divisor is less than halfSize x2 speed 🔥 (still 4x slower than ttmath on Uint256)

* Division: special case if dividend can overflow. 10% improvement.

* forgot to undo normalization (why did the test pass :??)

* 1st part, special cases of fast division

* Change bitops, simplify bithacks to detect new fast division cases

* 25% speed increase. Within 3x of ttmath

* Reimplement multiplication with minimum allocation

* Fix call. Now only 2x slower than ttmath

* Prepare for optimizing comparison operators

* Comparison inlining and optimization. 25% speed increase. 50% slower than ttmath now 🔥

* Fix comparison, optimize one()

* inline initMpUintImpl for another 20% speed. Only 20% slower than ttmath without ASM
2018-04-21 12:12:05 +02:00
mratsim 7a5fc76561 typo 2018-04-20 12:14:36 +02:00
mratsim 8a06bb28a0 Improve codegen for borrow. Fix #10 2018-04-20 11:55:15 +02:00
Mamy Ratsimbazafy 6eeba3d41a
Division: Fix recursive divide-and-conquer (#20)
* Simplify div2n1n

* Revert borrow detection, needed a cleverer scheme.

* Getting inspired by uint128 didn't work for recursive. Use recursive algo from the get go

* Fix shl bug ... (need fuzzy testing)

* divmod fixed for single nesting (?)

* Almost there

* Fix one part of div3n2n

* Division is wooorrrrkkinnnggg 🔥

* Fix compilation for the nested version

* forgot to not multiply by 8 the size

* Add another failing shift test

* Fix countLeadingZero for nested uint

* Cleanup: remove debugecho

* Move debug utils in a specific folder

* Fix forward declaration

* Move division it's own file
2018-04-20 11:13:47 +02:00
mratsim 55dd38c67c Fix borrow border case: see https://github.com/status-im/mpint/issues/10 2018-03-30 14:25:04 +02:00
mratsim 6c21b54a87 Significantly improve carry/borrow assembly generation https://github.com/status-im/mpint/issues/10 2018-03-30 01:40:30 +02:00
mratsim 03cb394b5d Fix xn vs x in div 2018-03-30 01:08:13 +02:00
mratsim 0417b30e56 Remove some debug leftovers 2018-03-28 21:59:16 +02:00
mratsim 4e12596295 500% division speed increase with bigint twice the size 2018-03-28 20:50:17 +02:00
Mamy Ratsimbazafy 24bd2fc986
Recursive init + bitwise as test + fix shr (#9)
* Recursive init compiles

* fix bitshift. Missing rolling over

* Strange shift required

* debug msg leftover
2018-03-28 20:45:39 +02:00
Mamy Ratsimbazafy c8190df152
Faster division algorithm (#8)
* cosmetic changes

* fix zero conversion

* Div using divided and conquer algorithm. (Compiles but doesn't work)

* Passes test with production flag
2018-03-28 17:15:36 +02:00
mratsim 2b47647019 Force checking sizes at compile-time 2018-03-26 17:39:34 +02:00
mratsim 49b3ee1006 Make the tests green again 2018-03-26 16:47:04 +02:00
mratsim 3e84c7e697 Benchmark was slowed down by Nim adding GenericResetAux 2018-03-26 16:16:07 +02:00
mratsim 34b25fd697 faster isZero 2018-03-26 16:09:31 +02:00
mratsim a809768854 Fix https://github.com/status-im/mpint/issues/7 17% speedup on modular division 2018-03-26 16:05:19 +02:00
mratsim f1935fd673 Improve speed by 90% by inline shr/shl 2018-03-26 14:46:38 +02:00
mratsim 0e7ecaef7a Add bench of modulo op 2018-03-26 12:50:50 +02:00
mratsim c65ab16512 Conversion fixes for <uint64. Also closes #4 and #5 2018-03-26 12:45:10 +02:00
mratsim 98b2086262 Use Status docker for continuous integration 2018-03-26 11:48:21 +02:00
Mamy Ratsimbazafy 3a1e5b1151
Make bits part of type (#6)
* Small reorg of conversion proc

* Rework with bits as type. Pass endianess test

* tests_comparison compiles and succeed

* Fix init with int for mpint_test compilation flag

* All tests green 🔥
2018-03-26 11:46:24 +02:00
mratsim 8b8f2a55c4 Relicense under dual Apache/MIT 2018-03-02 11:48:08 +01:00
mratsim fb2659703d Update License badge to Apache 2018-03-02 11:33:57 +01:00
Zahary Karadjov a9f51539b8 Set license to Apache v2 2018-02-27 19:37:29 +02:00
mratsim f53f7bd33a Missing overflow carry in multiplication (todo need test) 2018-02-27 13:40:18 +01:00
mratsim 8865ab874f init from uint of the same size 2018-02-17 18:32:23 +01:00
mratsim f06c02cf2a 5% more speed to divmod 2018-02-17 17:57:26 +01:00
mratsim 6fd471f243 Add division test + consistent Subtype conversion use 2018-02-17 12:44:51 +01:00
mratsim ac902b2a23 20% divmod improvement by using GCC Clang builtins when possible 2018-02-17 12:02:51 +01:00