[Bug target/48031] New: [4,4, 4.5 regression] gcc.c-torture/compile/pr42956.c ICEs gcc on m68k-linux, ivopts related?

["mikpe at it dot uu.se" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48031

           Summary: [4,4, 4.5 regression] gcc.c-torture/compile/pr42956.c
                    ICEs gcc on m68k-linux, ivopts related?
           Product: gcc
           Version: 4.5.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: mikpe@it.uu.se


The pr42956.c test case ICEs gcc 4.5 and 4.4 on m68k-linux:

> gcc/xgcc -Bgcc -O1 -S /.../gcc/testsuite/gcc.c-torture/compile/pr42956.c
/.../gcc/testsuite/gcc.c-torture/compile/pr42956.c: In function 'Split':
/.../gcc/testsuite/gcc.c-torture/compile/pr42956.c:10:6: error: expected an
SSA_NAME object
/.../gcc/testsuite/gcc.c-torture/compile/pr42956.c:10:6: error: in statement
D.2041_132 = D.1987 /[ex] 2;
/.../gcc/testsuite/gcc.c-torture/compile/pr42956.c:10:6: internal compiler
error: verify_ssa failed
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

This is with a cross to m68k-linux and --enable-checking=yes, with
--enable-checking=release the compiler segfaults instead.

Compiling with -O1 -fno-ivopts or -O0 eliminates the ICE.

This bug occurs with gcc-4.4.5 and gcc-4.5.2.  It does not occur with
gcc-4.3.5.  For gcc-4.6 it stopped occurring after the big MEM_REF update in
r161655.