[Bug rtl-optimization/88423] New: [9 Regression] ICE in begin_move_insn, at sched-ebb.c:175

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88423

            Bug ID: 88423
           Summary: [9 Regression] ICE in begin_move_insn, at
                    sched-ebb.c:175
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Keywords: ice-checking, ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---
            Target: x86_64-unknown-linux-gnu

gcc-9.0.0-alpha20181202 snapshot (r266729) ICEs when compiling
gcc/testsuite/gcc.dg/20030309-1.c w/ -march=skylake -Os -fPIC
-fsched2-use-superblocks -fno-if-conversion:

% x86_64-unknown-linux-gnu-gcc-9.0.0-alpha20181202 -march=skylake -Os -fPIC
-fsched2-use-superblocks -fno-if-conversion -c
gcc/testsuite/gcc.dg/20030309-1.c
during RTL pass: sched2
gcc/testsuite/gcc.dg/20030309-1.c: In function 'main':
gcc/testsuite/gcc.dg/20030309-1.c:42:1: internal compiler error: in
begin_move_insn, at sched-ebb.c:175
   42 | }
      | ^
0x777edb begin_move_insn
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181202/work/gcc-9-20181202/gcc/sched-ebb.c:175
0x777edb begin_move_insn
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181202/work/gcc-9-20181202/gcc/sched-ebb.c:145
0x1538e1c commit_schedule
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181202/work/gcc-9-20181202/gcc/haifa-sched.c:6228
0x1544015 schedule_block(basic_block_def**, void*)
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181202/work/gcc-9-20181202/gcc/haifa-sched.c:7065
0x15c94ff schedule_ebb(rtx_insn*, rtx_insn*, bool)
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181202/work/gcc-9-20181202/gcc/sched-ebb.c:537
0x15c9b1f schedule_ebbs()
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181202/work/gcc-9-20181202/gcc/sched-ebb.c:657
0xcb2ab4 rest_of_handle_sched2
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181202/work/gcc-9-20181202/gcc/sched-rgn.c:3738
0xcb2ab4 execute
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181202/work/gcc-9-20181202/gcc/sched-rgn.c:3876