get_simple_loop_desc uses the XNEW macro to allocate the new loop description,
thus the memory is not initialized.
At least the desc->infinite field thus can remain uninitialized when the
function returns.
As long as the optimizers only punt on infinity that can result in
pseudo-random
missed optimizations; as soon as something more intelligent is done with this
information, this results in compiler crashes.
I have a one-letter patch for this problem (plus two lines of comment), but
we're still waiting for the FSF acknowledgement that our Copyright Assignment
is on file.
--
Summary: get_simple_loop_desc returns uninitialized memory
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: rtl-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: amylaar at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39235
