27 lines
919 B
Nim
27 lines
919 B
Nim
# Copyright (c) 2018 Status Research & Development GmbH
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# Distributed under the MIT License (license terms are at http://opensource.org/licenses/MIT).
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import ../src/mpint, unittest
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suite "Testing multiplication implementation":
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test "Multiplication with result fitting in low half":
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let a = initMpUint(10000, uint32)
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let b = initMpUint(10000, uint32)
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check: cast[uint64](a*b) == 100_000_000'u64 # need 27-bits
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test "Multiplication with result overflowing low half":
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let a = initMpUint(1_000_000, uint32)
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let b = initMpUint(1_000_000, uint32)
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check: cast[uint64](a*b) == 1_000_000_000_000'u64 # need 40 bits
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test "Full overflow is handled like native unsigned types":
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let a = initMpUint(1_000_000_000, uint32)
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let b = initMpUint(1_000_000_000, uint32)
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let c = initMpUint(1_000, uint32)
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check: cast[uint64](a*b*c) == 1_000_000_000_000_000_000_000'u64 # need 70-bits |