[Bug tree-optimization/79887] New: [7 Regression] ICE in set_uid_loop_bbs, at tree-vectorizer.c:482

["marxin at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79887

            Bug ID: 79887
           Summary: [7 Regression] ICE in set_uid_loop_bbs, at
                    tree-vectorizer.c:482
           Product: gcc
           Version: 7.0
            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: ---

Created attachment 40886
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40886&action=edit
test-case

Starting from r242759 we ICE on of LLVM's test-case:

$ g++ copy.pass.cpp --param vect-epilogues-nomask=1
-I/home/marxin/BIG/Programming/llvm-project/libcxx/test/support/ -O3 -mavx512f
copy.pass.cpp: In function ‘C make(int, int) [with C = std::deque<int,
min_allocator<int> >]’:
copy.pass.cpp:26:1: internal compiler error: in set_uid_loop_bbs, at
tree-vectorizer.c:482
 make(int size, int start = 0 )
 ^~~~
0x1071196 set_uid_loop_bbs
        ../../gcc/tree-vectorizer.c:481
0x1071196 vectorize_loops()
        ../../gcc/tree-vectorizer.c:681

with -mtune=generic -march=x86-64.