[Bug tree-optimization/95627] New: [11 Regression] ICE in rs6000_density_test at rs6000.c:4992 since r11-1181-g371cc683371bedb0e53ebcee0c0e89604a1e74b1

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95627

            Bug ID: 95627
           Summary: [11 Regression] ICE in rs6000_density_test at
                    rs6000.c:4992 since
                    r11-1181-g371cc683371bedb0e53ebcee0c0e89604a1e74b1
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: rguenth at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-linux-gnu
            Target: ppc64le-linux-gnu

Since the revision I see:

$ ./xgcc -B.
/home/mliska/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/20070520-1.c
-fvar-tracking-assignments-toggle -ftree-loop-vectorize -O2
during GIMPLE pass: vect
/home/mliska/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/20070520-1.c:
In function ‘ff_pred8x8_plane_c’:
/home/mliska/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/20070520-1.c:4:6:
internal compiler error: Segmentation fault
    4 | void ff_pred8x8_plane_c(uint8_t *src, int stride){
      |      ^~~~~~~~~~~~~~~~~~
0xe7e38f crash_signal
        ../../gcc/toplev.c:328
0x1259ce4 rs6000_density_test
        ../../gcc/config/rs6000/rs6000.c:4992
0x125a00c rs6000_finish_cost
        ../../gcc/config/rs6000/rs6000.c:5102
0x1150170 finish_cost
        ../../gcc/tree-vectorizer.h:1400
0x1153821 vect_compute_single_scalar_iteration_cost
        ../../gcc/tree-vect-loop.c:1134
0x11568fb vect_analyze_loop_2
        ../../gcc/tree-vect-loop.c:2041
0x11586ef vect_analyze_loop(loop*, vec_info_shared*)
        ../../gcc/tree-vect-loop.c:2583
0x119131c try_vectorize_loop_1
        ../../gcc/tree-vectorizer.c:894
0x1191d69 vectorize_loops()
        ../../gcc/tree-vectorizer.c:1128
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