[Bug tree-optimization/95662] New: [11 regression] ICE at gimple-expr.c:87 since r11-1146

["seurer at linux dot vnet.ibm.com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95662

            Bug ID: 95662
           Summary: [11 regression] ICE at gimple-expr.c:87 since r11-1146
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: seurer at linux dot vnet.ibm.com
  Target Milestone: ---

g:1396fa5b91cfa0b3708ec9df33c0bb84386081d6, r11-1146

Note:  this may be related to pr95649.

I am seeing this on powerpc64 when building two of the spec2006 test cases,
454.calculix and 465.tonto.

[spectester@tulibee build_base_ppc64.0000]$
/opt/gcc-spec-nightly/trunk/bin/gfortran -c -o dgesv.o -ISPOOLES -O2 -m64
-mcpu=power8 dgesv.f
during GIMPLE pass: cunroll
dgesv.f:559:0:

  559 |       SUBROUTINE DLASWP( N, A, LDA, K1, K2, IPIV, INCX )
      | 
internal compiler error: tree check: expected class 'type', have 'exceptional'
(error_mark) in useless_type_conversion_p, at gimple-expr.c:87
0x102172fb tree_class_check_failed(tree_node const*, tree_code_class, char
const*, int, char const*)
        /home/spectester/gcc_trunk_git/gcc/gcc/tree.c:9738
0x1074f6f3 tree_class_check
        /home/spectester/gcc_trunk_git/gcc/gcc/tree.h:3419
0x1074f6f3 useless_type_conversion_p(tree_node*, tree_node*)
        /home/spectester/gcc_trunk_git/gcc/gcc/gimple-expr.c:87
0x117eed13 chrec_convert_1
        /home/spectester/gcc_trunk_git/gcc/gcc/tree-chrec.c:1435
0x117f3bcf chrec_apply(unsigned int, tree_node*, tree_node*)
        /home/spectester/gcc_trunk_git/gcc/gcc/tree-chrec.c:622
0x10ccdfb3 compute_overall_effect_of_inner_loop(loop*, tree_node*)
        /home/spectester/gcc_trunk_git/gcc/gcc/tree-scalar-evolution.c:471
0x10ccb643 analyze_scalar_evolution_1
        /home/spectester/gcc_trunk_git/gcc/gcc/tree-scalar-evolution.c:1960
0x10ccc6db analyze_scalar_evolution(loop*, tree_node*)
        /home/spectester/gcc_trunk_git/gcc/gcc/tree-scalar-evolution.c:2038
0x10ccd66b instantiate_scev_name
        /home/spectester/gcc_trunk_git/gcc/gcc/tree-scalar-evolution.c:2335
0x10ccd66b instantiate_scev_r
        /home/spectester/gcc_trunk_git/gcc/gcc/tree-scalar-evolution.c:2638
0x10ccd2a3 instantiate_scev_binary
        /home/spectester/gcc_trunk_git/gcc/gcc/tree-scalar-evolution.c:2467
0x10ccd2a3 instantiate_scev_r
        /home/spectester/gcc_trunk_git/gcc/gcc/tree-scalar-evolution.c:2654
0x10ccd0b7 instantiate_scev_poly
        /home/spectester/gcc_trunk_git/gcc/gcc/tree-scalar-evolution.c:2412
0x10ccd0b7 instantiate_scev_r
        /home/spectester/gcc_trunk_git/gcc/gcc/tree-scalar-evolution.c:2643
0x10ccddbb instantiate_scev(edge_def*, loop*, tree_node*)
        /home/spectester/gcc_trunk_git/gcc/gcc/tree-scalar-evolution.c:2719
0x10d9e783 instantiate_parameters
        /home/spectester/gcc_trunk_git/gcc/gcc/tree-scalar-evolution.h:63
0x10d9e783 idx_infer_loop_bounds
        /home/spectester/gcc_trunk_git/gcc/gcc/tree-ssa-loop-niter.c:3612
0x10dafbdb for_each_index(tree_node**, bool (*)(tree_node*, tree_node**,
void*), void*)
        /home/spectester/gcc_trunk_git/gcc/gcc/tree-ssa-loop.c:622
0x10d9ba73 infer_loop_bounds_from_ref
        /home/spectester/gcc_trunk_git/gcc/gcc/tree-ssa-loop-niter.c:3688
0x10d9ba73 infer_loop_bounds_from_array
        /home/spectester/gcc_trunk_git/gcc/gcc/tree-ssa-loop-niter.c:3709
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