[Bug tree-optimization/33742] New: Segfault in vectorizable_operation

["pthaugen at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

Seeing a segfault trying to build 164.gzip from cpu2000.  Noticed it with -O3,
but also occurs for "-O2/-O1 -ftree-vectorize".

run/00000001> cat junk.c
typedef unsigned short ush;
extern ush prev[];
void fill_window()
{
    register unsigned n, m;

        for (n = 0; n < 32768; n++) {
            m = prev[n];
            prev[n] = (ush)(m >= 0x8000 ? m-0x8000 : 0);
        }
}
run/00000001> /home/pthaugen/install/gcc/trunk/bin/gcc -c -m32 -O3 junk.c
junk.c: In function 'fill_window':
junk.c:4: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


Program received signal SIGSEGV, Segmentation fault.
vectorizable_operation (stmt=0xf7f69860, bsi=0x0, vec_stmt=0x0, slp_node=0x0)
    at /home/pthaugen/src/gcc/trunk/gcc/gcc/tree-vect-transform.c:3807
3807      nunits_out = TYPE_VECTOR_SUBPARTS (vectype_out);
(gdb) bt 5 
#0  vectorizable_operation (stmt=0xf7f69860, bsi=0x0, vec_stmt=0x0,
slp_node=0x0)
    at /home/pthaugen/src/gcc/trunk/gcc/gcc/tree-vect-transform.c:3807
#1  0x106efc68 in vect_analyze_operations (loop_vinfo=0x109d8d20)
    at /home/pthaugen/src/gcc/trunk/gcc/gcc/tree-vect-analyze.c:484
#2  0x106f7060 in vect_analyze_loop (loop=0xf7ec43f0)
    at /home/pthaugen/src/gcc/trunk/gcc/gcc/tree-vect-analyze.c:4341
#3  0x104d010c in vectorize_loops ()
    at /home/pthaugen/src/gcc/trunk/gcc/gcc/tree-vectorizer.c:2501
#4  0x1045e000 in tree_vectorize ()
    at /home/pthaugen/src/gcc/trunk/gcc/gcc/tree-ssa-loop.c:216
(More stack frames follow...)


-- 
           Summary: Segfault in vectorizable_operation
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pthaugen at gcc dot gnu dot org
 GCC build triplet: powerpc64-linux
  GCC host triplet: powerpc64-linux
GCC target triplet: powerpc64-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33742