[Bug rtl-optimization/32069] New: segfault in regclass() with -O0 -fsplit-wide-types

["rask at sygehus dot dk" <gcc-bugzilla at gcc dot gnu dot org>]

-bash-3.2$ /usr/local/gcc/bin/gcc -O0 -fsplit-wide-types /tmp/segfault.c -S -o
/dev/null
/tmp/segfault.c: In function 'segfault':
/tmp/segfault.c:4: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

The lower subreg pass sets regno_reg_rtx[i] to NULL_RTX when splitting register
i. regclass() uses PSEUDO_REGNO_MODE(i) which expands to GET_MODE
(regno_reg_rtx[i)) and gives the segfault.


-- 
           Summary: segfault in regclass() with -O0 -fsplit-wide-types
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rask at sygehus dot dk
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32069