https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87273
Bug ID: 87273
Summary: [8/9 Regression] ICE in merge_fences, at
sel-sched-ir.c:708
Product: gcc
Version: unknown
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: ---
Target: x86_64-pc-linux-gnu
gcc-9.0.0-alpha20180902 snapshot (r264045) ICEs when compiling the following
snippet w/ -march=core2 -Os -fschedule-insns -fsel-sched-pipelining
-fselective-scheduling -fno-ssa-phiopt -fno-tree-loop-im:
int sd;
void
w5 (int n4)
{
long int *vq = (long int *) &n4;
while (n4 < 1)
{
int ks;
ks = !!(n4 + 1) ? ((++sd) == *vq) : 0;
if (ks == 1 / *vq)
*vq *= sd;
}
}
% gcc-9.0.0-alpha20180902 -march=core2 -Os -fschedule-insns
-fsel-sched-pipelining -fselective-scheduling -fno-ssa-phiopt -fno-tree-loop-im
-c mdrdoij6.c
during RTL pass: sched1
mdrdoij6.c: In function 'w5':
mdrdoij6.c:16:1: internal compiler error: in merge_fences, at
sel-sched-ir.c:708
16 | }
| ^
0x64a6f4 merge_fences
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180902/work/gcc-9-20180909/gcc/sel-sched-ir.c:708
0xc71d8a move_fence_to_fences(_list_node*, flist_tail_def*)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180902/work/gcc-9-20180909/gcc/sel-sched-ir.c:841
0xc8082b calculate_new_fences
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180902/work/gcc-9-20180909/gcc/sel-sched.c:7425
0xc8082b sel_sched_region_2
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180902/work/gcc-9-20180909/gcc/sel-sched.c:7505
0xc81386 sel_sched_region_1
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180902/work/gcc-9-20180909/gcc/sel-sched.c:7546
0xc82b66 sel_sched_region(int)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180902/work/gcc-9-20180909/gcc/sel-sched.c:7647
0xc83a81 run_selective_scheduling()
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180902/work/gcc-9-20180909/gcc/sel-sched.c:7733
0xc6379d rest_of_handle_sched
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180902/work/gcc-9-20180909/gcc/sched-rgn.c:3718
0xc6379d execute
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180902/work/gcc-9-20180909/gcc/sched-rgn.c:3828
