[libmath-prime-util-perl] 27/35: Make sure large primorials don't overflow sigma_0

[Partha P. Mukherjee]

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ppm-guest pushed a commit to annotated tag v0.33
in repository libmath-prime-util-perl.

commit 019534724231c0278817704a9089e8de72086846
Author: Dana Jacobsen <dana at acm.org>
Date:   Thu Nov 14 17:03:10 2013 -0800

    Make sure large primorials don't overflow sigma_0
---
 lib/Math/Prime/Util.pm | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/Math/Prime/Util.pm b/lib/Math/Prime/Util.pm
index 544af84..eb1067a 100644
--- a/lib/Math/Prime/Util.pm
+++ b/lib/Math/Prime/Util.pm
@@ -1552,6 +1552,9 @@ sub divisor_sum {
                     : ($k  > 5) ? 1
                     : $n >= $_ds_overflow[$k];
 
+  # Given a large enough primorial, even k=0 will overflow.
+  $will_overflow = 1 if $k==0 && ref($n) eq 'Math::BigInt' && $n->length > 123;
+
   return _XS_divisor_sum($n, $k) if $n <= $_XS_MAXVAL && !$will_overflow;
 
   if ($will_overflow) {

-- 
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