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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/100669] New: [OpenACC] ICE with array-reduction variable & related issues Date: Wed, 19 May 2021 08:32:35 +0000 [thread overview] Message-ID: <bug-100669-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100669 Bug ID: 100669 Summary: [OpenACC] ICE with array-reduction variable & related issues Product: gcc Version: 12.0 Status: UNCONFIRMED Keywords: ice-on-valid-code, openacc Severity: normal Priority: P3 Component: middle-end Assignee: unassigned at gcc dot gnu.org Reporter: burnus at gcc dot gnu.org CC: tschwinge at gcc dot gnu.org Target Milestone: --- While OpenMP supports reduction(+: sum[:10]) [→ PR99928 comment 8], it is not quite clear to me whether OpenACC supports it. (Admittedly, I also have not verified it in the OpenACC spec, yet). I did not find any OpenACC testcase related to array reduction or struct element/derived-type component reductions. In any case, in C/C++, using an array gives the following ICE: # gcc-trunk -fopenacc -fdump-tree-original foo.c foo.c: In function ‘foo’: foo.c:6:11: internal compiler error: tree check: expected tree that contains ‘decl minimal’ structure, have ‘mem_ref’ in splay_tree_compare_decl_uid, at gimplify.c:440 6 | #pragma acc parallel loop reduction(+:sum) | ^~~ 0x788f2f tree_contains_struct_check_failed(tree_node const*, tree_node_structure_enum, char const*, int, char const*) ../../repos/gcc/gcc/tree.c:8857 * * * On the Fortran side, reduction(+: array) is permitted for OpenACC during parsing but fails during resolution time with: Error: Array ‘sum’ is not permitted in reduction at (1) I also note that for a derived type, there is the odd result: 46 | !$acc parallel loop reduction(+:x%sum3) | 1 Error: !$OMP DECLARE REDUCTION + not found for type TYPE(t) at (1) with 'type t; integer :: sum3; end type'. Namely: the error is a bit odd as the reduction variable is 'integer' which does not need declare reduction – while the error talks about the derived type itself ('x') Question: Is it expected that 'x%...' should be parsed (accepted) with OpenACC? With OpenMP it fails at parse time with: 38 | !$omp parallel do reduction(+:x%sum3) | 1 Error: Syntax error in OpenMP variable list at (1) NOTE: I have not checked what happens on the C/C++ side with struct elements.
next reply other threads:[~2021-05-19 8:32 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-05-19 8:32 burnus at gcc dot gnu.org [this message] 2021-05-19 9:38 ` [Bug middle-end/100669] " tschwinge at gcc dot gnu.org
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