https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104716
Bug ID: 104716
Summary: ICE in copy_loop_before, at
tree-loop-distribution.cc:952
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
gfortran 12.0.1 20220227 snapshot (g:d1574a9b820f17adb9004255e2018967e9be063b)
ICEs when compiling the following testcase w/ -O2 -ftree-loop-distribution
-fno-move-loop-stores -fno-tree-dominator-opts:
SUBROUTINE FOO()
COMMON /WORK/ C2(2, 2)
DIMENSION D11(2)
EQUIVALENCE (D11(1), C2(1, 1))
DO 40 I = 1, 2
DO 30 J = 1, 2
ASSIGN 10 TO ILBL
IF (C2(J, I) .NE. 0.0) THEN
ASSIGN 20 TO ILBL
ENDIF
GO TO ILBL
10 CONTINUE
20 CONTINUE
C2(J, I) = C2(J, I) + 1
30 CONTINUE
40 CONTINUE
DO 50 I = 1, 2
PRINT 90, I
50 CONTINUE
RETURN
90 FORMAT(I5)
END
% gfortran-12.0.1 -O2 -ftree-loop-distribution -fno-move-loop-stores
-fno-tree-dominator-opts -w -c umdmfg43.f
during GIMPLE pass: ldist
umdmfg43.f:1:20:
1 | SUBROUTINE FOO()
| ^
internal compiler error: in copy_loop_before, at tree-loop-distribution.cc:952
0x740892 copy_loop_before
/var/tmp/portage/sys-devel/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/tree-loop-distribution.cc:952
0x740892 generate_loops_for_partition
/var/tmp/portage/sys-devel/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/tree-loop-distribution.cc:988
0x740892 generate_code_for_partition
/var/tmp/portage/sys-devel/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/tree-loop-distribution.cc:1348
0x740892 loop_distribution::distribute_loop(loop*, vec<gimple*, va_heap,
vl_ptr> const&, control_dependences*, int*, bool*, bool)
/var/tmp/portage/sys-devel/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/tree-loop-distribution.cc:3167
0xff7caf loop_distribution::execute(function*)
/var/tmp/portage/sys-devel/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/tree-loop-distribution.cc:3816
0xff899b execute
/var/tmp/portage/sys-devel/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/tree-loop-distribution.cc:3905
