Known bugs in MPFR-2001
The functions mpfr_agm and mpfr_log produce
a Segmentation fault for large precision (more than 1000 bits).
Apply the following patch to agm.c.
The function mpfr_set_str_raw produces an error when the input
is zero. Apply the following patch to set_str_raw.c.
The function mpfr_out_str may print 0 for +infinity or
-infinity. Apply the following patch to out_str.c.
The function mpfr_div_ui may return incorrect results
when the dividend is zero. Apply the following
patch to div_ui.c.
The function mpfr_mul_ui returns incorrect results
when the destination uses more words than the multiplicand.
Apply the following patch to mul_ui.c.