https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109552
Bug ID: 109552
Summary: ICE with "cancel" directive in "taskloop" construct
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: frederik at gcc dot gnu.org
Target Milestone: ---
Created attachment 54882
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54882&action=edit
C version of the test
The following Fortran code produces an ICE in the middle-end when I compile it
as a libgomp test (i.e. with -fopenmp; same error at different optimization
levels):
program test
integer :: a
integer :: i
!$omp parallel
!$omp taskloop
do i = 1,10
!$omp cancel taskgroup if (a .eq. 1)
call abort ()
end do
!$omp end taskloop
!$omp end parallel
end program
Error:
FAIL: libgomp.fortran/cancel-taskloop.f90 -O (test for excess errors)
Excess errors:
during GIMPLE pass: ompexp
../../../../libgomp/testsuite/libgomp.fortran/cancel-taskloop.f90:6:16:
internal compiler error: in verify_sese, at tree-cfg.cc:7654
0x7c0878 verify_sese(basic_block_def*, basic_block_def*, vec<basic_block_def*,
va_heap, vl_ptr>*)
../../gcc/tree-cfg.cc:7654
0x14d4958 move_sese_region_to_fn(function*, basic_block_def*, basic_block_def*,
tree_node*)
../../gcc/tree-cfg.cc:7770
0x2606968 expand_omp_taskreg
../../gcc/omp-expand.cc:1444
0x260ca3f expand_omp_synch
../../gcc/omp-expand.cc:8659
0x260ca3f expand_omp
../../gcc/omp-expand.cc:10616
0x260c77c expand_omp
../../gcc/omp-expand.cc:10565
0x260c77c expand_omp
../../gcc/omp-expand.cc:10565
0x260e9fa execute_expand_omp
../../gcc/omp-expand.cc:10819
A canonical conversion of the test to C/C++ leads to the same error from
gcc/g++.
I am not sure if the code is valid according to the OpenMP spec, but the ICE is
certainly wrong.
The GCC build has been configured with "--enable-languages=fortran,c,c++
--enable-checking=all --disable-multilib --disable-bootstrap" and the version
is
"gcc version 14.0.0 20230419 (experimental) (GCC)".
