https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97212
Bug ID: 97212
Summary: [OpenMP] 'depend' clause with 'target nowait' (!) +
'task' does not work
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Keywords: openmp, wrong-code
Severity: normal
Priority: P3
Component: libgomp
Assignee: unassigned at gcc dot gnu.org
Reporter: burnus at gcc dot gnu.org
CC: jakub at gcc dot gnu.org
Target Milestone: ---
Created attachment 49274
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49274&action=edit
C testcase, run with -fopenmp
The SOLLVE_VV testcase
https://github.com/SOLLVE/sollve_vv/blob/master/tests/4.5/task/test_target_and_task_nowait.c
FAILS. Note: It also fails with a compiler which is not even configured for
offloading and, hence, everything is run on the host.
It uses with 'nowait' and 'depend':
#pragma omp target map(tofrom: a, sum) depend(out: a) nowait
... (set 'a') ...
#pragma omp task depend(in: a) shared(a,errors)
... check value of ...
A comment indicates a problem with real-world code:
// This test checks if dependence expressed on target and task
// regions are honoured in the presense of nowait.
// This test is motivated by OpenMP usage in QMCPack.
