Re: (GCC) 13.0.1: internal compiler error

[Patrick Begou <Patrick.Begou@univ-grenoble-alpes.fr>]

Hi Harald

as I said, it is a large, massively parallel fortran code: more than 700 
files, some with several thousands of lines. It could be difficult to 
create a small reproducer but I will try if the problem is not known as 
an other git branch of this code also create an internal error on 
another file.

Best regards

Patrick

Le 24/04/2023 à 19:27, Harald Anlauf a écrit :
> Hi Patrick,
>
> I did not see any similar report in bugzilla, so could you please
> open a PR and attach a self-contained reproducer?  Ideally the
> reproducer would be reduced to simplify the analysis for those
> familiar with the status of the OpenACC implementation.
>
> Thanks,
> Harald
>
> Am 21.04.23 um 17:13 schrieb Patrick Begou:
>> Hi,
>>
>> I have built this morning the latest gfortran from a git clone:
>>
>> GNU Fortran (GCC) 13.0.1 20230421 (prerelease)
>>
>> I'm trying this compiler on a large and complexe Fortran90 code with
>> offloading using OpenACC.
>>
>> At this time:
>>
>> - code compiles with nvfortran and runs on A100 GPU.
>>
>> - code compiles with Cray Fortran (with some difficulties) but do not
>> run on MI250 GPU (we are tacking the problem, a segfault if openacc is
>> set on)
>>
>> - code compile with GNU GCC 13 without -fopenacc option and runs on cpu
>> (Epyc2 7302)
>>
>> - a basic test-code using OpenACC compiles and run on the GPU.
>>
>> - compiling my large code with gcc 13.0.1 using -fopenacc for A100 GPU
>> produce an internal error in the compiler :
>>
>>
>> transforms_defs_m.f90:354:53:
>>
>>    354 |             !$acc enter data attach(atransform2%next)
>>        |                                                     ^
>> internal compiler error: in omp_group_base, at gimplify.cc:9412
>> 0xa830c6 omp_group_base
>>      ../../gcc/gcc/gimplify.cc:9412
>> 0xa830c6 omp_index_mapping_groups_1
>>      ../../gcc/gcc/gimplify.cc:9441
>> 0xa833c7 omp_index_mapping_groups
>>      ../../gcc/gcc/gimplify.cc:9502
>> 0xa96a9a gimplify_scan_omp_clauses
>>      ../../gcc/gcc/gimplify.cc:10802
>> 0xa8660d gimplify_omp_target_update
>>      ../../gcc/gcc/gimplify.cc:15563
>> 0xa8660d gimplify_expr(tree_node**, gimple**, gimple**, bool
>> (*)(tree_node*), int)
>>      ../../gcc/gcc/gimplify.cc:16928
>> 0xa89826 gimplify_stmt(tree_node**, gimple**)
>>      ../../gcc/gcc/gimplify.cc:7219
>> 0xa875a3 gimplify_statement_list
>>      ../../gcc/gcc/gimplify.cc:2019
>> 0xa875a3 gimplify_expr(tree_node**, gimple**, gimple**, bool
>> (*)(tree_node*), int)
>>      ../../gcc/gcc/gimplify.cc:16821
>> 0xa89826 gimplify_stmt(tree_node**, gimple**)
>>      ../../gcc/gcc/gimplify.cc:7219
>> 0xa86e8a gimplify_and_add(tree_node*, gimple**)
>>      ../../gcc/gcc/gimplify.cc:492
>> 0xa86e8a gimplify_loop_expr
>>      ../../gcc/gcc/gimplify.cc:1993
>> 0xa86e8a gimplify_expr(tree_node**, gimple**, gimple**, bool
>> (*)(tree_node*), int)
>>      ../../gcc/gcc/gimplify.cc:16581
>> 0xa89826 gimplify_stmt(tree_node**, gimple**)
>>      ../../gcc/gcc/gimplify.cc:7219
>> 0xa875a3 gimplify_statement_list
>>      ../../gcc/gcc/gimplify.cc:2019
>> 0xa875a3 gimplify_expr(tree_node**, gimple**, gimple**, bool
>> (*)(tree_node*), int)
>>      ../../gcc/gcc/gimplify.cc:16821
>> 0xa89826 gimplify_stmt(tree_node**, gimple**)
>>      ../../gcc/gcc/gimplify.cc:7219
>> 0xa89d2b gimplify_bind_expr
>>      ../../gcc/gcc/gimplify.cc:1430
>> 0xa86d8e gimplify_expr(tree_node**, gimple**, gimple**, bool
>> (*)(tree_node*), int)
>>      ../../gcc/gcc/gimplify.cc:16577
>> 0xa89826 gimplify_stmt(tree_node**, gimple**)
>>      ../../gcc/gcc/gimplify.cc:7219
>> Please submit a full bug report, with preprocessed source (by using
>> -freport-bug).
>>
>>
>> Options used (I've just added  -fopenacc for moving from cpu version to
>> OpenACC):
>>
>> -fopenacc -freport-bug -g -fpic -x f95-cpp-input -std=gnu -ffree-form
>> -fall-intrinsics -fallow-argument-mismatch -Wall -Wextra -W
>> -Wno-unused-function -Wno-compare-reals -fno-omit-frame-pointer -O3
>> -ftree-vectorize -ffast-math -funroll-loops -pipe
>>
>> No additionnal files a produced with -freport-bug.
>>
>> In attachment the script used to build the compiler.
>>
>> Let me know how I can help with informations to improve Gnu fortran
>> compilers.
>>
>> Patrick
>