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  • #14085

Closed
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Created Aug 03, 2017 by ocheron@trac-ocheron

powModInteger sometimes ignores sign of argument

Function intToSBigNat# returns a PosBN result when input is < -1, but it should be NegBN instead.

As a consequence functions like powModInteger give incorrect result for small negative numbers:

$ ghci
GHCi, version 8.2.1: http://www.haskell.org/ghc/  :? for help
> :m GHC.Integer.GMP.Internals
> powModInteger (-2) 3 123
8
> (-2)^3 `mod` 123
115
Trac metadata
Trac field Value
Version 8.2.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Core Libraries
Test case
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