------- Comment #21 from sebpop at gmail dot com 2009-08-14 17:16 -------
Subject: Re: aermod.f90 ICEs on -O2 -fgraphite-identity
-floop-strip-mine
> Actually the error in gdb has changed with 1677_max.diff...
>
As expected: see the gcc_assert in the patch
+/* Return in RES the maximum of the linear expression LE on polyhedron PS. */
+
+void
+ppl_max_for_le (ppl_Pointset_Powerset_C_Polyhedron_t ps,
+ ppl_Linear_Expression_t le, Value res)
+{
+ ppl_Coefficient_t num, denom;
+ Value dv, nv;
+ int maximum;
+
+ value_init (nv);
+ value_init (dv);
+ ppl_new_Coefficient (&num);
+ ppl_new_Coefficient (&denom);
+ ppl_Pointset_Powerset_C_Polyhedron_maximize (ps, le, num, denom, &maximum);
+
+ if (maximum)
+ {
+ ppl_Coefficient_to_mpz_t (num, nv);
+ ppl_Coefficient_to_mpz_t (denom, dv);
+ gcc_assert (value_notzero_p (dv));
+ value_division (res, nv, dv);
+ }
+
+ value_clear (nv);
+ value_clear (dv);
+ ppl_delete_Coefficient (num);
+ ppl_delete_Coefficient (denom);
+}
What worries me is that PPL finds a maximum, but that is not a valid
max, as the denominator is zero. Roberto, could you please look at
the bug http://gcc.gnu.org/PR40981 ?
Thanks,
Sebastian
> Program exited with code 04.
> (gdb) bt
> No stack.
>
> so I am no longer able to get a back trace.
That's because you do not load the gdbinit.in from the gcc dir, where
you have the following breakpoints:
# Put breakpoints at exit and fancy_abort in case abort is mapped
# to either fprintf/exit or fancy_abort.
b fancy_abort
# Put a breakpoint on internal_error to help with debugging ICEs.
b internal_error
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40981
