28 lines
1.1 KiB
Nim
28 lines
1.1 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, ./int_bitwise_ops, ./initialization, ./uint_highlow
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# XXX There's some Araq reason why this isn't part of the std lib..
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func high(_: typedesc[SomeUnsignedInt]): SomeUnsignedInt =
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not SomeUnsignedInt(0'u8)
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func high*[T, T2](_: typedesc[IntImpl[T, T2]]): IntImpl[T, T2] {.inline.}=
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# The highest signed int has representation
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# 0b0111_1111_1111_1111 ....
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# so we only have to unset the most significant bit.
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result.hi = high(type result.hi)
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result.lo = high(type result.lo)
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func low*[T, T2](_: typedesc[IntImpl[T, T2]]): IntImpl[T, T2] {.inline.}=
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# The lowest signed int has representation
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# 0b1000_0000_0000_0000 ....
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# so we only have to set the most significant bit.
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not high(IntImpl[T, T2])
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