https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77621

UroŇ° Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |NEW
                 CC|                            |rguenth at gcc dot gnu.org
          Component|target                      |tree-optimization

--- Comment #6 from UroŇ° Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #5)
> Started to ICE with r230310.

Confirmed.

Reduced testcase fails with -O3 -msse2 -mtune=atom for 32bit and 64bit x86
targets in:

Program received signal SIGSEGV, Segmentation fault.
0x00000000006de13e in tree_class_check (__t=0x0, __class=tcc_type,
__f=0x215b580 "../../git/gcc/gcc/tree-vect-data-refs.c", __l=761, 
    __g=0x215d260
<vect_compute_data_ref_alignment(data_reference*)::__FUNCTION__>
"vect_compute_data_ref_alignment")
    at ../../git/gcc/gcc/tree.h:3148
3148      if (TREE_CODE_CLASS (TREE_CODE (__t)) != __class)
(gdb) bt
#0  0x00000000006de13e in tree_class_check (__t=0x0, __class=tcc_type,
__f=0x215b580 "../../git/gcc/gcc/tree-vect-data-refs.c", __l=761, 
    __g=0x215d260
<vect_compute_data_ref_alignment(data_reference*)::__FUNCTION__>
"vect_compute_data_ref_alignment")
    at ../../git/gcc/gcc/tree.h:3148
#1  0x000000000199f40d in vect_compute_data_ref_alignment (dr=0x29688e0) at
../../git/gcc/gcc/tree-vect-data-refs.c:759

(gdb) f 1
#1  0x000000000199f40d in vect_compute_data_ref_alignment (dr=0x29688e0) at
../../git/gcc/gcc/tree-vect-data-refs.c:759
759           if (tree_fits_shwi_p (step)
(gdb) list
754       else
755         {
756           tree step = DR_STEP (dr);
757           unsigned vf = loop ? LOOP_VINFO_VECT_FACTOR (loop_vinfo) : 1;
758
759           if (tree_fits_shwi_p (step)
760               && ((tree_to_shwi (step) * vf)
761                   % GET_MODE_SIZE (TYPE_MODE (vectype)) != 0))
762             {
763               if (dump_enabled_p ())
(gdb) p vectype
$1 = (tree) 0x0

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