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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/110528] selective scheduling seems to go into
 an infinite loop
Date: Mon, 03 Jul 2023 22:04:54 +0000
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X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Version: 12.3.1
X-Bugzilla-Keywords: compile-time-hog
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110528

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Timeout with with specific  |selective scheduling seems
                   |optimizations               |to go into an infinite loop
             Target|                            |x86_64-linux-gnu
      Known to fail|                            |14.0
          Component|middle-end                  |rtl-optimization

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
#0  0x0000000000f67ac0 in vinsn_equal_p(vinsn_def*, vinsn_def*) () at
/home/apinski/src/upstream-gcc/gcc/gcc/sel-sched-ir.cc:1603
#1  0x0000000000f68679 in av_set_lookup (set=3D<error reading variable:
dwarf2_find_location_expression: Corrupted DWARF expression.>,
sought_vinsn=3D0x5003ee0) at
/home/apinski/src/upstream-gcc/gcc/gcc/sel-sched-ir.cc:2120
#2  0x0000000000f78747 in compute_av_set_inside_bb(rtx_insn*, _list_node*, =
int,
bool) () at /home/apinski/src/upstream-gcc/gcc/gcc/vec.h:1504
#3  0x0000000000f7dc9d in compute_av_set (unique_p=3D<error reading variabl=
e:
dwarf2_find_location_expression: Corrupted DWARF expression.>, ws=3D<error
reading variable: dwarf2_find_location_expression: Corrupted DWARF
expression.>,
    p=3D<error reading variable: dwarf2_find_location_expression: Corrupted=
 DWARF
expression.>, insn=3D<error reading variable: dwarf2_find_location_expressi=
on:
Corrupted DWARF expression.>) at
/home/apinski/src/upstream-gcc/gcc/gcc/sel-sched.cc:5058
#4  compute_av_set_on_boundaries (av_vliw_p=3D0x7fffffffc008,
av_vliw_p@entry=3D<error reading variable: dwarf2_find_location_expression:
Corrupted DWARF expression.>, bnds=3D<optimized out>, fence=3D<optimized ou=
t>) at
/home/apinski/src/upstream-gcc/gcc/gcc/sel-sched.cc:5058
#5  fill_insns (scheduled_insns_tailpp=3D<synthetic pointer>, seqno=3D-1,
fence=3D<optimized out>) at
/home/apinski/src/upstream-gcc/gcc/gcc/sel-sched.cc:5523
#6  schedule_on_fences (scheduled_insns_tailpp=3D<synthetic pointer>,
max_seqno=3D1, fences=3D<optimized out>) at
/home/apinski/src/upstream-gcc/gcc/gcc/sel-sched.cc:7353
#7  sel_sched_region_2(int) () at
/home/apinski/src/upstream-gcc/gcc/gcc/sel-sched.cc:7491
#8  0x0000000000f7ff97 in sel_sched_region_1() () at
/home/apinski/src/upstream-gcc/gcc/gcc/sel-sched.cc:7533
#9  0x0000000000f8157c in sel_sched_region (rgn=3D20) at
/home/apinski/src/upstream-gcc/gcc/gcc/sel-sched.cc:7634
#10 sel_sched_region(int) () at
/home/apinski/src/upstream-gcc/gcc/gcc/sel-sched.cc:7619
#11 0x0000000000f8174a in run_selective_scheduling () at
/home/apinski/src/upstream-gcc/gcc/gcc/sel-sched.cc:7720
#12 0x0000000000f634ed in rest_of_handle_sched () at
/home/apinski/src/upstream-gcc/gcc/gcc/sched-rgn.cc:3729=