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ppm-guest pushed a commit to annotated tag v0.32
in repository libmath-prime-util-perl.
commit 2b593427c163d9d37316952ef864cd21d01176f8
Author: Dana Jacobsen <d...@acm.org>
Date: Wed Sep 25 22:10:55 2013 -0700
Fix pure perl lucas sequence with Q=-1
---
lib/Math/Prime/Util/PP.pm | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/lib/Math/Prime/Util/PP.pm b/lib/Math/Prime/Util/PP.pm
index 4fde2ab..aaa130a 100644
--- a/lib/Math/Prime/Util/PP.pm
+++ b/lib/Math/Prime/Util/PP.pm
@@ -1041,7 +1041,8 @@ sub lucas_sequence {
else { $Qk->bmul($Qk)->bmod($n); }
}
}
- $Qk->neg if $qsign == 1;
+ if ($qsign == 1) { $Qk->bneg; }
+ elsif ($qsign == -1) { $Qk = $n->copy->bdec; }
}
$U->bmod($n);
$V->bmod($n);
--
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