[OpenMP] Fix transformed loop's var privacy
Without this patch, the following example crashes Clang:
```
#pragma omp target map(i)
#pragma omp tile sizes(2)
for (i = 0; i < N; ++i)
;
```
This patch fixes the crash by changing `Sema::isOpenMPPrivateDecl` not
to identify `i` as private just because it's the loop variable of a
`tile` construct.
While OpenMP TR11 and earlier do specify privacy for loop variables of
loops *generated* from a `tile` construct, I haven't found text
stating that the original loop variable must be private in the above
example, so this patch leaves it shared. Even so, it is a bit
unexpected that value of `i` after the loop is `N - 1` instead of `N`.
Reviewed By: ABataev
Differential Revision: https://reviews.llvm.org/D151356
GitOrigin-RevId: 19841e4dcaabe573d35eb88a130fc34d32ecd708
diff --git a/libomptarget/test/offloading/target-tile.c b/libomptarget/test/offloading/target-tile.c
new file mode 100644
index 0000000..8460b43
--- /dev/null
+++ b/libomptarget/test/offloading/target-tile.c
@@ -0,0 +1,62 @@
+// Check that omp tile (introduced in OpenMP 5.1) is permitted and behaves when
+// strictly nested within omp target.
+
+// RUN: %libomptarget-compile-generic -fopenmp-version=51
+// RUN: %libomptarget-run-generic 2>&1 | %fcheck-generic
+
+#include <stdio.h>
+
+#define I_NTILES 8
+#define J_NTILES 9
+#define I_NELEMS 2
+#define J_NELEMS 3
+
+int main() {
+ int order[I_NTILES][J_NTILES][I_NELEMS][J_NELEMS];
+ int i, j;
+ #pragma omp target map(tofrom: i, j)
+ {
+ int next = 0;
+ #pragma omp tile sizes(I_NELEMS, J_NELEMS)
+ for (i = 0; i < I_NTILES * I_NELEMS; ++i) {
+ for (j = 0; j < J_NTILES * J_NELEMS; ++j) {
+ int iTile = i / I_NELEMS;
+ int jTile = j / J_NELEMS;
+ int iElem = i % I_NELEMS;
+ int jElem = j % J_NELEMS;
+ order[iTile][jTile][iElem][jElem] = next++;
+ }
+ }
+ }
+ int expected = 0;
+ for (int iTile = 0; iTile < I_NTILES; ++iTile) {
+ for (int jTile = 0; jTile < J_NTILES; ++jTile) {
+ for (int iElem = 0; iElem < I_NELEMS; ++iElem) {
+ for (int jElem = 0; jElem < J_NELEMS; ++jElem) {
+ int actual = order[iTile][jTile][iElem][jElem];
+ if (expected != actual) {
+ printf("error: order[%d][%d][%d][%d] = %d, expected %d\n",
+ iTile, jTile, iElem, jElem, actual, expected);
+ return 1;
+ }
+ ++expected;
+ }
+ }
+ }
+ }
+ // Tiling leaves the loop variables with their values from the final iteration
+ // rather than with the usual +1.
+ expected = I_NTILES * I_NELEMS - 1;
+ if (i != expected) {
+ printf("error: i = %d, expected %d\n", i, expected);
+ return 1;
+ }
+ expected = J_NTILES * J_NELEMS - 1;
+ if (j != expected) {
+ printf("error: j = %d, expected %d\n", j, expected);
+ return 1;
+ }
+ // CHECK: success
+ printf("success\n");
+ return 0;
+}
