[Bug middle-end/68453] New: graphite ICE: segfault

[Joost.VandeVondele at mat dot ethz.ch]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68453

            Bug ID: 68453
           Summary: graphite ICE: segfault
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: Joost.VandeVondele at mat dot ethz.ch
  Target Milestone: ---

current trunk (r230637) crashes with

> cat bug.f90
MODULE dbcsr_geev
  INTEGER, PARAMETER :: real_8=8
CONTAINS
  SUBROUTINE dbcsr_dgeev(jobvl,jobvr,matrix,ndim,evals,revec,levec)
    CHARACTER(1)                             :: jobvl, jobvr
    REAL(real_8), DIMENSION(:, :)            :: matrix
    INTEGER                                  :: ndim
    COMPLEX(real_8), DIMENSION(:)            :: evals
    COMPLEX(real_8), DIMENSION(:, :)         :: revec, levec
    INTEGER                                  :: i, info, lwork
    REAL(real_8)                             :: norm, tmp_array(ndim,ndim), &
                                                work(20*ndim)
    REAL(real_8), DIMENSION(ndim)            :: eval1, eval2
    REAL(real_8), DIMENSION(ndim, ndim)      :: evec_l, evec_r
    DO WHILE (i.le.ndim)
      IF(ABS(eval2(i)).LT.EPSILON(REAL(0.0,real_8)))THEN
        norm=SQRT(SUM(evec_r(:,i)**2.0_real_8)+SUM(evec_r(:,i+1)**2.0_real_8))
        revec(:,i)=CMPLX(evec_r(:,i),evec_r(:,i+1),real_8)/norm
      END IF
    END DO
  END SUBROUTINE  dbcsr_dgeev 
END MODULE dbcsr_geev 

> gfortran -c  -O2  -floop-nest-optimize bug.f90
bug.f90:4:0:

   SUBROUTINE dbcsr_dgeev(jobvl,jobvr,matrix,ndim,evals,revec,levec)


internal compiler error: Segmentation fault
0xb5c56f crash_signal
        ../../gcc/gcc/toplev.c:334
0xbaf347 ssa_default_def(function*, tree_node*)
        ../../gcc/gcc/tree-dfa.c:305
0xbb1d88 get_or_create_ssa_default_def(function*, tree_node*)
        ../../gcc/gcc/tree-dfa.c:357
0xbe8ce3 get_reaching_def
        ../../gcc/gcc/tree-into-ssa.c:1168
0xbe8ce3 get_reaching_def
        ../../gcc/gcc/tree-into-ssa.c:1155
0xbea968 rewrite_update_phi_arguments
        ../../gcc/gcc/tree-into-ssa.c:2015
0xbea968 rewrite_update_dom_walker::before_dom_children(basic_block_def*)
        ../../gcc/gcc/tree-into-ssa.c:2135
0xbea968 rewrite_update_dom_walker::before_dom_children(basic_block_def*)
        ../../gcc/gcc/tree-into-ssa.c:2068
0x124aeda dom_walker::walk(basic_block_def*)
        ../../gcc/gcc/domwalk.c:176
0xbe7715 rewrite_blocks
        ../../gcc/gcc/tree-into-ssa.c:2190
0xbee94e update_ssa(unsigned int)
        ../../gcc/gcc/tree-into-ssa.c:3351
0x1274bb1
translate_isl_ast_to_gimple::translate_isl_ast_node_user(isl_ast_node*,
edge_def*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
        ../../gcc/gcc/graphite-isl-ast-to-gimple.c:1026
0x1275505 translate_isl_ast_to_gimple::translate_isl_ast_node_block(loop*,
isl_ast_node*, edge_def*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
        ../../gcc/gcc/graphite-isl-ast-to-gimple.c:1051
0x1275505 translate_isl_ast_to_gimple::translate_isl_ast_node_block(loop*,
isl_ast_node*, edge_def*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
        ../../gcc/gcc/graphite-isl-ast-to-gimple.c:1051
0x1275505 translate_isl_ast_to_gimple::translate_isl_ast_node_block(loop*,
isl_ast_node*, edge_def*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
        ../../gcc/gcc/graphite-isl-ast-to-gimple.c:1051
0x1274f7a graphite_regenerate_ast_isl(scop*)
        ../../gcc/gcc/graphite-isl-ast-to-gimple.c:2999
0x126d690 graphite_transform_loops()
        ../../gcc/gcc/graphite.c:343
0x126db60 graphite_transforms
        ../../gcc/gcc/graphite.c:371
0x126db60 execute
        ../../gcc/gcc/graphite.c:448
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