| commit | 2e353a635b90a6c31eee5fd4ec0335f37f130628 | [log] [tgz] |
|---|---|---|
| author | Andre Kuhlenschmidt <andre.kuhlenschmidt@gmail.com> | Mon Apr 14 09:08:21 2025 -0700 |
| committer | GitHub <noreply@github.com> | Mon Apr 14 09:08:21 2025 -0700 |
| tree | 3d51c304847239530b880a2715bfd017e4a53063 | |
| parent | 71d10590dbc041139644f00144513c7f487a94ba [diff] |
[flang][openacc] Relax constraint on OpenACC declare statement (#135238)
OpenACC declare statements are restricted from having having clauses
that reference assumed size arrays. It should be the case that we can
implement `deviceptr` and `present` clauses for assumed-size arrays.
This is a first step towards relaxing this restriction.
Note running flang on the following example results in an error in
lowering.
```
$ cat t.f90
subroutine vadd (a, b, c, n)
real(8) :: a(*), b(*), c(*)
!$acc declare deviceptr(a, b, c)
!$acc parallel loop
do i = 1,n
c(i) = a(i) + b(i)
enddo
end subroutine
$ flang -fopenacc -c t.f90
error: loc("/home/akuhlenschmi/work/p4/ta/tests/openacc/src/t.f90":3:7): expect declare attribute on variable in declare operation
error: Lowering to LLVM IR failed
error: loc("/home/akuhlenschmi/work/p4/ta/tests/openacc/src/t.f90":4:7): unsupported OpenACC operation: acc.private.recipe
error: loc("/home/akuhlenschmi/work/p4/ta/tests/openacc/src/t.f90":4:7): LLVM Translation failed for operation: acc.private.recipe
error: failed to create the LLVM module
```
I would like to to share this code, because others are currently working
on the implementation of `deviceptr`, but it is obviously not running
end-to-end. I think the cleanest approach to this would be to put this
exception to the rule behind some feature flag, but I am not certain
what the precedence for that is.
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