After this statement

$b_ecc = $b_ecc->as_hex();
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$b_ecc is no longer an object, you replaced it with a simple scalar value ("0xdeadbeef" or whatever ->as_hex() returns). But then you try to execute '$b_ecc->is_odd()' on something that's no longer an object and Perl complains about it.

Solution: Don't clobber your variables, pick some other names:

my $val1 = $b_ecc->as_hex();
my $val2 = $bmask->as_hex();
my $val3 = $bigint_data->as_hex();
print "$val3, $val2, $val1\n";

$count_xor+=1 if($b_ecc->is_odd());
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