mirror of
https://github.com/status-im/nim-stint.git
synced 2025-02-21 03:18:13 +00:00
3a1e5b1151
* 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 🔥
77 lines
2.0 KiB
Nim
77 lines
2.0 KiB
Nim
# Mpint
|
|
# Copyright 2018 Status Research & Development GmbH
|
|
# Licensed under either of
|
|
#
|
|
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
|
|
# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
|
|
#
|
|
# at your option. This file may not be copied, modified, or distributed except according to those terms.
|
|
|
|
import ../src/mpint, unittest
|
|
|
|
suite "Testing addition implementation":
|
|
test "In-place addition gives expected result":
|
|
|
|
var a = 20182018.initMpUint(64)
|
|
let b = 20172017.initMpUint(64)
|
|
|
|
a += b
|
|
|
|
check: cast[uint64](a) == 20182018'u64 + 20172017'u64
|
|
|
|
test "Addition gives expected result":
|
|
|
|
let a = 20182018.initMpUint(64)
|
|
let b = 20172017.initMpUint(64)
|
|
|
|
check: cast[uint64](a+b) == 20182018'u64 + 20172017'u64
|
|
|
|
test "When the low half overflows, it is properly carried":
|
|
# uint8 (low half) overflow at 255
|
|
let a = 100.initMpUint(16)
|
|
let b = 100.initMpUint(16)
|
|
|
|
check: cast[uint16](a+b) == 200
|
|
|
|
test "Full overflow is handled like native unsigned types":
|
|
# uint16 overflows after 65535
|
|
let a = 100.initMpUint(16)
|
|
var z = 0.initMpUint(16)
|
|
let o = 36.initMpUint(16)
|
|
|
|
for _ in 0 ..< 655:
|
|
z += a
|
|
|
|
check: cast[uint16](z) == 65500
|
|
check: cast[uint16](z + o) == 0
|
|
|
|
z += a
|
|
check: cast[uint16](z) == 64
|
|
|
|
z += a
|
|
check: cast[uint16](z) == 164
|
|
|
|
suite "Testing substraction implementation":
|
|
test "In-place substraction gives expected result":
|
|
|
|
var a = 20182018.initMpUint(64)
|
|
let b = 20172017.initMpUint(64)
|
|
|
|
a -= b
|
|
|
|
check: cast[uint64](a) == 20182018'u64 - 20172017'u64
|
|
|
|
test "Substraction gives expected result":
|
|
|
|
let a = 20182018.initMpUint(64)
|
|
let b = 20172017.initMpUint(64)
|
|
|
|
check: cast[uint64](a-b) == 20182018'u64 - 20172017'u64
|
|
|
|
test "Full overflow is handled like native unsigned types":
|
|
# uint16 overflows after 65535
|
|
let a = 100.initMpUint(16)
|
|
let b = 101.initMpUint(16)
|
|
|
|
check: cast[uint16](a-b) == high(uint16)
|