52 lines
1.5 KiB
Nim
52 lines
1.5 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 ./datatypes, ./bithacks, ./as_words, ./as_signed_words,
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./bithacks
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func isZero*(n: SomeSignedInt): bool {.inline.} =
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n == 0
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func isZero*(n: IntImpl): bool {.inline.} =
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asWords(n, ignoreEndianness = true):
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if n != 0:
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return false
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return true
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func isNegative*(n: IntImpl): bool {.inline.} =
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## Returns true if a number is negative:
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n.msb.bool
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func `<`*(x, y: IntImpl): bool {.inline.}=
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# Lower comparison for multi-precision integers
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asSignedWordsZip(x, y):
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if x != y:
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return x < y
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return false # they're equal
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func `==`*(x, y: IntImpl): bool {.inline.}=
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# Equal comparison for multi-precision integers
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asWordsZip(x, y, ignoreEndianness = true):
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if x != y:
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return false
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return true # they're equal
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func `<=`*(x, y: IntImpl): bool {.inline.}=
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# Lower or equal comparison for multi-precision integers
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asSignedWordsZip(x, y):
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if x != y:
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return x < y
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return true # they're equal
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func isOdd*(x: IntImpl): bool {.inline.}=
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bool(x.least_significant_word and 1)
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func isEven*(x: IntImpl): bool {.inline.}=
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not x.isOdd
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