[Bug tree-optimization/68823] New: [graphite] tramp3d-v4 compiled with -floop-nest-optimize crashes

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68823

            Bug ID: 68823
           Summary: [graphite] tramp3d-v4 compiled with
                    -floop-nest-optimize crashes
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
  Target Milestone: ---

(with isl-0.15)

  % g++ -floop-nest-optimize -Ofast -w tramp3d-v4.cpp
  % ./a.out --cartvis 1.0 0.0 --rhomin 1e-8 -n 20
Using
  using [1,1,1] block setup for computation on domain [0:63:1,0:63:1,0:63:1]
  solving eeq
  time increments from [0, 1.79769e+308], cfl 0.5
  starting at t = 0, i = 1
  cell physical/total domain [0:62:1,0:62:1,0:62:1], [-2:64:1,-2:64:1,-2:64:1]
  face  physical/total domain [0:62:1,0:62:1,0:62:1], [-2:64:1,-2:64:1,-2:64:1]
  periodic boundaries in X Y Z
[1]    3243 segmentation fault  ./a.out --cartvis 1.0 0.0 --rhomin 1e-8 -n 20