19 lines
532 B
Nim
19 lines
532 B
Nim
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# 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 uint_type
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proc `+=`*[T: MpUint](a: var T, b: T) {.noSideEffect.}=
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type Base = type a.lo
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let tmp = a.lo
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a.lo += b.lo
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a.hi += (a.lo < tmp).Base + b.hi
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# Optimized assembly should contain adc instruction (add with carry)
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# Clang on MacOS does with the -d:release switch.
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proc `+`*[T: MpUint](a: T, b: T): T {.noSideEffect, noInit.}=
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result = a
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result += b
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