https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91161
Bug ID: 91161
Summary: [10 Regression] ICE in begin_move_insn, at
sched-ebb.c:175
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Keywords: ice-on-invalid-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-10.0.0-alpha20190707 snapshot (r273184) ICEs when compiling the following
testcase w/ -march=skylake -O2 (-O3, -Ofast) -fsched2-use-superblocks -fno-dce:
int b6, hi;
void
ni ()
{
__builtin_unreachable ();
}
void
fa (int *zr)
{
int ee;
if (b6 != 0)
{
if (ee != 0)
{
x6:
b6 = 0;
}
zr = hi;
ni (zr);
}
*zr = hi;
}
% x86_64-unknown-linux-gnu-gcc-10.0.0-alpha20190707 -march=skylake -O2
-fsched2-use-superblocks -fno-dce -w -c ucjsvetc.c
during RTL pass: sched2
ucjsvetc.c: In function 'fa':
ucjsvetc.c:27:1: internal compiler error: in begin_move_insn, at
sched-ebb.c:175
27 | }
| ^
0x16480a6 begin_move_insn
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20190707/work/gcc-10-20190707/gcc/sched-ebb.c:175
0x16480a6 begin_move_insn
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20190707/work/gcc-10-20190707/gcc/sched-ebb.c:145
0x15bd4e3 commit_schedule
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20190707/work/gcc-10-20190707/gcc/haifa-sched.c:6228
0x15bd4e3 schedule_block(basic_block_def**, void*)
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20190707/work/gcc-10-20190707/gcc/haifa-sched.c:7065
0x16482ca schedule_ebb(rtx_insn*, rtx_insn*, bool)
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20190707/work/gcc-10-20190707/gcc/sched-ebb.c:537
0x16488ba schedule_ebbs()
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20190707/work/gcc-10-20190707/gcc/sched-ebb.c:656
0xcf7c40 rest_of_handle_sched2
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20190707/work/gcc-10-20190707/gcc/sched-rgn.c:3744
0xcf7c40 execute
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20190707/work/gcc-10-20190707/gcc/sched-rgn.c:3882
gcc 8 and 9 also reject it w/ -fchecking (error: missing barrier after block 4)
but don't ICE.
