If you haven't already, upgrade to the newest Math::BigInt and Math::BigFloat from CPAN and confirm that it still happens.

BTW, I find it a lot easier to say: 

$ perl -wle'print for atan2(1,0), atan2(0,1)'

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In reply to Re: wrong results of atan2 with bignum by ysth
in thread wrong results of atan2 with bignum by ambrus

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