mpn_perfect_square_p requires normalised input?
dmharvey at cims.nyu.edu
Mon Sep 20 19:57:09 CEST 2010
In GMP 5.0.1, it appears that mpn_perfect_square_p requires the input
to be normalised, i.e. the high limb is not allowed to be zero, but
this is not documented. If called with a zero high limb, and the
residue tests fail to rule out the input being a non-square, then
control is passed immediately to mpn_sqrtrem, which requires
normalised input (typical result is a segfault).
More information about the gmp-bugs