[Bug c/99347] New: [9/10/11 Regression] ICE in create_block_for_bookkeeping, at sel-sched.c:4549

["gscfq@t-online.de" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99347

            Bug ID: 99347
           Summary: [9/10/11 Regression] ICE in
                    create_block_for_bookkeeping, at sel-sched.c:4549
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

Using following options and testfile gcc.dg/tree-ssa/ifc-pr69489-2.c
This issue started with r9, between 20190331 and 20190414 :
(under the hood related to pr95636 ?)


$ gcc-11-20210228 -c ifc-pr69489-2.c -O1 -fvar-tracking-assignments
-fschedule-insns -fselective-scheduling
cc1: warning: var-tracking-assignments changes selective scheduling
during RTL pass: sched1
ifc-pr69489-2.c: In function 'foo':
ifc-pr69489-2.c:15:1: internal compiler error: in create_block_for_bookkeeping,
at sel-sched.c:4549
   15 | }
      | ^
0xb2c995 create_block_for_bookkeeping
        ../../gcc/sel-sched.c:4549
0xb2c995 find_place_for_bookkeeping
        ../../gcc/sel-sched.c:4686
0xb2c995 generate_bookkeeping_insn
        ../../gcc/sel-sched.c:4786
0xb2c995 move_op_at_first_insn
        ../../gcc/sel-sched.c:6063
0xb2d037 code_motion_path_driver
        ../../gcc/sel-sched.c:6657
0xb2d2ce code_motion_process_successors
        ../../gcc/sel-sched.c:6342
0xb2d2ce code_motion_path_driver
        ../../gcc/sel-sched.c:6608
0xb2d703 move_op
        ../../gcc/sel-sched.c:6702
0xb2d703 move_exprs_to_boundary
        ../../gcc/sel-sched.c:5223
0xb2d703 schedule_expr_on_boundary
        ../../gcc/sel-sched.c:5436
0xb30b94 fill_insns
        ../../gcc/sel-sched.c:5578
0xb32943 schedule_on_fences
        ../../gcc/sel-sched.c:7353
0xb32943 sel_sched_region_2
        ../../gcc/sel-sched.c:7491
0xb334dd sel_sched_region_1
        ../../gcc/sel-sched.c:7533
0xb33fab sel_sched_region(int)
        ../../gcc/sel-sched.c:7634
0xb349e9 run_selective_scheduling()
        ../../gcc/sel-sched.c:7720
0xb1642d rest_of_handle_sched
        ../../gcc/sched-rgn.c:3724
0xb1642d execute
        ../../gcc/sched-rgn.c:3834