[Bug tree-optimization/61511] New: [4.10 Regression] ICE: in vect_can_force_dr_alignment_p, at tree-vect-data-refs.c:5320 with -fno-toplevel-reorder -ftree-slp-vectorize

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61511

            Bug ID: 61511
           Summary: [4.10 Regression] ICE: in
                    vect_can_force_dr_alignment_p, at
                    tree-vect-data-refs.c:5320 with -fno-toplevel-reorder
                    -ftree-slp-vectorize
           Product: gcc
           Version: 4.10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz

Created attachment 32941
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=32941&action=edit
reduced testcase

Compiler output:
$ gcc -O -fno-toplevel-reorder -ftree-slp-vectorize testcase.c         
testcase.c: In function 'foo':
testcase.c:8:1: internal compiler error: in vect_can_force_dr_alignment_p, at
tree-vect-data-refs.c:5320
 foo (void)
 ^
0x1408ca1 vect_can_force_dr_alignment_p(tree_node const*, unsigned int)
        /mnt/svn/gcc-trunk/gcc/tree-vect-data-refs.c:5320
0x1409871 vect_compute_data_ref_alignment
        /mnt/svn/gcc-trunk/gcc/tree-vect-data-refs.c:723
0x1409871 vect_compute_data_refs_alignment
        /mnt/svn/gcc-trunk/gcc/tree-vect-data-refs.c:809
0x1409871 vect_analyze_data_refs_alignment(_loop_vec_info*, _bb_vec_info*)
        /mnt/svn/gcc-trunk/gcc/tree-vect-data-refs.c:1978
0xd5c5b8 vect_slp_analyze_bb_1
        /mnt/svn/gcc-trunk/gcc/tree-vect-slp.c:2132
0xd5c5b8 vect_slp_analyze_bb(basic_block_def*)
        /mnt/svn/gcc-trunk/gcc/tree-vect-slp.c:2266
0xd5ea12 execute
        /mnt/svn/gcc-trunk/gcc/tree-vectorizer.c:629
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r211670 - ICE
r211489 - OK
4_9 r211338 - OK