2018-04-25 19:21:58 +00:00
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# Stint
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2018-04-25 17:51:14 +00:00
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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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2018-05-06 20:29:08 +00:00
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2018-04-30 11:38:55 +00:00
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import ./datatypes, ./uint_bitwise_ops, ./int_bitwise_ops, ./initialization
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2018-04-25 17:51:14 +00:00
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2018-05-06 20:29:08 +00:00
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func high*[T](_: typedesc[IntImpl[T]]): IntImpl[T] {.inline.}=
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2018-04-25 17:51:14 +00:00
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2018-05-17 07:45:42 +00:00
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# The highest signed int has representation
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2018-04-30 11:38:55 +00:00
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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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2018-05-17 07:43:41 +00:00
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let only_msb_unset = UintImpl[T].zero.not shr 1
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result = cast[IntImpl[T]](only_msb_unset)
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2018-04-25 17:51:14 +00:00
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2018-05-06 20:29:08 +00:00
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func low*[T](_: typedesc[IntImpl[T]]): IntImpl[T] {.inline.}=
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2018-04-25 17:51:14 +00:00
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# The lowest signed int has representation
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2018-04-30 11:38:55 +00:00
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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])
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