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feat(p/uint256): uint256 (#1778)
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original code from: https://github.com/holiman/uint256
gnoswap implementation:
https://github.com/gnoswap-labs/gnoswap/tree/main/packages/big/uint256

ref: #1698 (comment)

here's the metrics for reference:

```plain
// gno test -v=true -print-runtime-metrics=true ./
=== RUN   TestAdd
--- PASS: TestAdd (0.00s)
---       runtime: cycle=25.9k imports=3 allocs=756.0k(0.15%)
=== RUN   TestSub
--- PASS: TestSub (0.00s)
---       runtime: cycle=54.7k imports=3 allocs=1.5M(0.30%)
=== RUN   TestMul
--- PASS: TestMul (0.00s)
---       runtime: cycle=76.5k imports=3 allocs=2.1M(0.42%)
=== RUN   TestDiv
--- PASS: TestDiv (0.00s)
---       runtime: cycle=87.6k imports=3 allocs=2.5M(0.50%)
=== RUN   TestMod
--- PASS: TestMod (0.00s)
---       runtime: cycle=100.8k imports=3 allocs=3.0M(0.59%)
=== RUN   TestDivMod
--- PASS: TestDivMod (0.00s)
---       runtime: cycle=128.8k imports=3 allocs=4.0M(0.80%)
=== RUN   TestNeg
--- PASS: TestNeg (0.00s)
---       runtime: cycle=203.1k imports=3 allocs=5.5M(1.10%)
=== RUN   TestExp
--- PASS: TestExp (0.00s)
---       runtime: cycle=356.9k imports=3 allocs=8.7M(1.73%)
=== RUN   TestOr
=== RUN   TestOr/all_zeros
--- PASS: TestOr/all_zeros (0.00s)
=== RUN   TestOr/all_ones
--- PASS: TestOr/all_ones (0.00s)
=== RUN   TestOr/mixed
--- PASS: TestOr/mixed (0.00s)
=== RUN   TestOr/one_operand_all_ones
--- PASS: TestOr/one_operand_all_ones (0.00s)
--- PASS: TestOr (0.00s)
---       runtime: cycle=364.2k imports=3 allocs=9.0M(1.80%)
=== RUN   TestAnd
=== RUN   TestAnd/all_zeros
--- PASS: TestAnd/all_zeros (0.00s)
=== RUN   TestAnd/all_ones
--- PASS: TestAnd/all_ones (0.00s)
=== RUN   TestAnd/mixed
--- PASS: TestAnd/mixed (0.00s)
=== RUN   TestAnd/mixed_2
--- PASS: TestAnd/mixed_2 (0.00s)
=== RUN   TestAnd/mixed_3
--- PASS: TestAnd/mixed_3 (0.00s)
=== RUN   TestAnd/one_operand_zero
--- PASS: TestAnd/one_operand_zero (0.00s)
=== RUN   TestAnd/one_operand_all_ones
--- PASS: TestAnd/one_operand_all_ones (0.00s)
--- PASS: TestAnd (0.00s)
---       runtime: cycle=376.6k imports=3 allocs=9.6M(1.92%)
=== RUN   TestNot
=== RUN   TestNot/all_zeros
--- PASS: TestNot/all_zeros (0.00s)
=== RUN   TestNot/all_ones
--- PASS: TestNot/all_ones (0.00s)
=== RUN   TestNot/mixed
--- PASS: TestNot/mixed (0.00s)
--- PASS: TestNot (0.00s)
---       runtime: cycle=381.2k imports=3 allocs=9.8M(1.97%)
=== RUN   TestAndNot
=== RUN   TestAndNot/all_zeros
--- PASS: TestAndNot/all_zeros (0.00s)
=== RUN   TestAndNot/all_ones
--- PASS: TestAndNot/all_ones (0.00s)
=== RUN   TestAndNot/mixed
--- PASS: TestAndNot/mixed (0.00s)
=== RUN   TestAndNot/mixed_2
--- PASS: TestAndNot/mixed_2 (0.00s)
=== RUN   TestAndNot/mixed_3
--- PASS: TestAndNot/mixed_3 (0.00s)
=== RUN   TestAndNot/one_operand_zero
--- PASS: TestAndNot/one_operand_zero (0.00s)
=== RUN   TestAndNot/one_operand_all_ones
--- PASS: TestAndNot/one_operand_all_ones (0.00s)
--- PASS: TestAndNot (0.00s)
---       runtime: cycle=393.6k imports=3 allocs=10.4M(2.08%)
=== RUN   TestXor
=== RUN   TestXor/all_zeros
--- PASS: TestXor/all_zeros (0.00s)
=== RUN   TestXor/all_ones
--- PASS: TestXor/all_ones (0.00s)
=== RUN   TestXor/mixed
--- PASS: TestXor/mixed (0.00s)
=== RUN   TestXor/mixed_2
--- PASS: TestXor/mixed_2 (0.00s)
=== RUN   TestXor/mixed_3
--- PASS: TestXor/mixed_3 (0.00s)
=== RUN   TestXor/one_operand_zero
--- PASS: TestXor/one_operand_zero (0.00s)
=== RUN   TestXor/one_operand_all_ones
--- PASS: TestXor/one_operand_all_ones (0.00s)
--- PASS: TestXor (0.00s)
---       runtime: cycle=406.0k imports=3 allocs=11.0M(2.20%)
=== RUN   TestLsh
--- PASS: TestLsh (0.00s)
---       runtime: cycle=531.2k imports=3 allocs=13.8M(2.77%)
=== RUN   TestRsh
--- PASS: TestRsh (0.00s)
---       runtime: cycle=636.1k imports=3 allocs=16.3M(3.25%)
=== RUN   TestCmp
--- PASS: TestCmp (0.00s)
---       runtime: cycle=647.6k imports=3 allocs=16.7M(3.34%)
=== RUN   TestIsZero
--- PASS: TestIsZero (0.00s)
---       runtime: cycle=650.3k imports=3 allocs=16.8M(3.36%)
=== RUN   TestLtUint64
--- PASS: TestLtUint64 (0.00s)
---       runtime: cycle=656.1k imports=3 allocs=17.0M(3.40%)
=== RUN   TestSGT
--- PASS: TestSGT (0.00s)
---       runtime: cycle=666.1k imports=3 allocs=17.2M(3.44%)
=== RUN   TestEq
--- PASS: TestEq (0.00s)
---       runtime: cycle=714.3k imports=3 allocs=18.2M(3.64%)
=== RUN   TestIsUint64
--- PASS: TestIsUint64 (0.00s)
---       runtime: cycle=719.5k imports=3 allocs=18.3M(3.67%)
=== RUN   TestDec
=== RUN   TestDec/zero
--- PASS: TestDec/zero (0.00s)
=== RUN   TestDec/less_than_20_digits
--- PASS: TestDec/less_than_20_digits (0.00s)
=== RUN   TestDec/max_possible_value
--- PASS: TestDec/max_possible_value (0.00s)
--- PASS: TestDec (0.00s)
---       runtime: cycle=735.2k imports=3 allocs=18.9M(3.78%)
ok      ./ 	0.61s
```

cc: @r3v4s @dongwon8247 @mconcat

---------

Co-authored-by: n3wbie <r3v4@onbloc.xyz>
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notJoon and r3v4s authored Mar 29, 2024
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28 changes: 28 additions & 0 deletions examples/gno.land/p/demo/uint256/LICENSE
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BSD 3-Clause License

Copyright 2020 uint256 Authors

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
5 changes: 5 additions & 0 deletions examples/gno.land/p/demo/uint256/README.md
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# Fixed size 256-bit math library

This is a library specialized at replacing the `big.Int` library for math based on 256-bit types.

original repository: [uint256](<https://github.com/holiman/uint256/tree/master>)
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