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53 lines
1.4 KiB
Nim
53 lines
1.4 KiB
Nim
# Stint
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# Copyright 2018 Status Research & Development GmbH
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# Licensed under either of
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#
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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#
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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import
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./datatypes,
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./primitives/addcarry_subborrow
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func isZero*(n: SomeUnsignedInt): bool {.inline.} =
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n == 0
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func isZero*(limbs: Limbs): bool {.inline.} =
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for word in limbs:
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if not word.isZero():
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return false
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return true
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func `<`*(x, y: Limbs): bool {.inline.}=
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# Lower comparison for multi-precision integers
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var diff: Word
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var borrow: Borrow
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for wx, wy in leastToMostSig(x, y):
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subB(borrow, diff, wx, wy, borrow)
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return bool(borrow)
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func `==`*(x, y: Limbs): bool {.inline.}=
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# Equal comparison for multi-precision integers
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for wx, wy in leastToMostSig(x, y):
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if wx != wy:
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return false
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return true
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func `<=`*(x, y: Limbs): bool {.inline.}=
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# Lower or equal comparison for multi-precision integers
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not(y < x)
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func isEven*(x: SomeUnsignedInt): bool {.inline.} =
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(x and 1) == 0
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func isEven*(x: Limbs): bool {.inline.}=
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x.leastSignificantWord.isEven
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func isOdd*(x: SomeUnsignedInt): bool {.inline.} =
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not x.isEven
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func isOdd*(x: Limbs): bool {.inline.}=
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not x.isEven
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