[llvm-branch-commits] [mlir] [MLIR][OpenMP] Support allocations of device shared memory (PR #150924)

[Michael Kruse via llvm-branch-commits]

================
@@ -1102,12 +1102,64 @@ struct DeferredStore {
 };
 } // namespace
 
+/// Check whether allocations for the given operation might potentially have to
+/// be done in device shared memory. That means we're compiling for a offloading
+/// target, the operation is an `omp::TargetOp` or nested inside of one and that
+/// target region represents a Generic (non-SPMD) kernel.
+///
+/// This represents a necessary but not sufficient set of conditions to use
+/// device shared memory in place of regular allocas. Depending on the variable,
+/// its uses or the associated OpenMP construct might also need to be taken into
+/// account.
+static bool
+mightAllocInDeviceSharedMemory(Operation &op,
+                               const llvm::OpenMPIRBuilder &ompBuilder) {
+  if (!ompBuilder.Config.isTargetDevice())
+    return false;
+
+  auto targetOp = dyn_cast<omp::TargetOp>(op);
----------------
Meinersbur wrote:

```suggestion
  auto *targetOp = dyn_cast<omp::TargetOp>(op);
```

https://github.com/llvm/llvm-project/pull/150924