https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84872
Bug ID: 84872
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-alpha20180311 snapshot (r258438) ICEs when compiling the following
snippet w/ -O1 -floop-parallelize-all -freorder-blocks-and-partition
-fschedule-insns2 -fselective-scheduling2 -fsel-sched-pipelining -fno-tree-dce:
void
s6 (int nx)
{
int z8[2];
int uw, vs = 0;
for (uw = 0; uw < 2; ++uw)
z8[uw] = 0;
for (uw = 0; uw < 2; ++uw)
z8[uw] = 0;
while (vs < 1)
while (nx < 1)
++nx;
}
% gcc-8.0.0-alpha20180311 -O1 -floop-parallelize-all
-freorder-blocks-and-partition -fschedule-insns2 -fselective-scheduling2
-fsel-sched-pipelining -fno-tree-dce -c cix8q525.c
during RTL pass: sched2
cix8q525.c: In function 's6':
cix8q525.c:15:1: internal compiler error: in create_preheader, at
cfgloopmanip.c:1536
}
^
0x5cfe79 create_preheader(loop*, int)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/cfgloopmanip.c:1535
0x89aa57 create_preheaders(int)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/cfgloopmanip.c:1552
0xb156b9 apply_loop_flags
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/loop-init.c:64
0xb160ec loop_optimizer_init(unsigned int)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/loop-init.c:123
0xc5714d sel_init_pipelining()
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched-ir.c:6093
0xc57582 sel_find_rgns()
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched-ir.c:6240
0xc4ca74 find_rgns
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sched-rgn.c:1077
0xc4ca74 sched_rgn_init(bool)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sched-rgn.c:3250
0xc6e181 sel_global_init
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:7661
0xc6e181 run_selective_scheduling()
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:7715
0xc4de55 rest_of_handle_sched2
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sched-rgn.c:3729
0xc4de55 execute
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sched-rgn.c:3873
