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 | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |