https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83770
Bug ID: 83770
Summary: [8 Regression] ICE in create_preheader, at
cfgloopmanip.c:1536
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: 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: ---
gcc-8.0.0-alpha20180107 snapshot (r256324) w/ r256420 applied on top of it
still ICEs when compiling the following snippet w/ -O2 (-O3, -Ofast)
-fselective-scheduling2 -fsel-sched-pipelining -fno-tree-vrp:
int qt, h1;
void
py (void)
{
h1 = 1 / (!!qt && !!h1);
for (;;)
{
}
}
% gcc-8.0.0-alpha20180107 -O2 -fselective-scheduling2 -fsel-sched-pipelining
-fno-tree-vrp -c aeu1f56a.c
during RTL pass: sched2
aeu1f56a.c: In function 'py':
aeu1f56a.c:10:1: internal compiler error: in create_preheader, at
cfgloopmanip.c:1536
}
^
0x5cafc0 create_preheader(loop*, int)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180107/work/gcc-8-20180107/gcc/cfgloopmanip.c:1535
0x9820b7 create_preheaders(int)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180107/work/gcc-8-20180107/gcc/cfgloopmanip.c:1552
0xbe5229 apply_loop_flags
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180107/work/gcc-8-20180107/gcc/loop-init.c:64
0xbe5afc loop_optimizer_init(unsigned int)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180107/work/gcc-8-20180107/gcc/loop-init.c:123
0xd070fd sel_init_pipelining()
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180107/work/gcc-8-20180107/gcc/sel-sched-ir.c:6093
0xd07522 sel_find_rgns()
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180107/work/gcc-8-20180107/gcc/sel-sched-ir.c:6240
0xcfd732 find_rgns
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180107/work/gcc-8-20180107/gcc/sched-rgn.c:1077
0xcfd732 sched_rgn_init(bool)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180107/work/gcc-8-20180107/gcc/sched-rgn.c:3250
0xd1e821 sel_global_init
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180107/work/gcc-8-20180107/gcc/sel-sched.c:7661
0xd1e821 run_selective_scheduling()
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180107/work/gcc-8-20180107/gcc/sel-sched.c:7715
0xcfebc5 rest_of_handle_sched2
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180107/work/gcc-8-20180107/gcc/sched-rgn.c:3729
0xcfebc5 execute
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180107/work/gcc-8-20180107/gcc/sched-rgn.c:3873
