================
@@ -0,0 +1,97 @@
+// RUN: %libomptarget-compile-run-and-check-generic
+// Tests non-contiguous array sections with expression-based count on struct
+// member arrays with both FROM and TO directives.
+
+#include <omp.h>
+#include <stdio.h>
+
+struct S {
+ int len;
+ double data[20];
+};
+
+int main() {
+ struct S s;
+ s.len = 10;
+
+ // Initialize on device
+#pragma omp target map(tofrom : s)
+ {
+ for (int i = 0; i < s.len; i++) {
+ s.data[i] = i;
+ }
+ }
+
+ // Test FROM: Modify on device, then update from device
+#pragma omp target data map(to : s)
+ {
+#pragma omp target
+ {
+ for (int i = 0; i < s.len; i++) {
+ s.data[i] += i * 10;
+ }
+ }
+
+ // Update from device with expression-based count: len/2 elements
+#pragma omp target update from(s.data[0 : s.len / 2 : 2])
+ }
+
+ printf("struct count expression (from):\n");
+ for (int i = 0; i < s.len; i++)
+ printf("%f\n", s.data[i]);
+
+ // Test TO: Reset, modify host, update to device
+#pragma omp target map(tofrom : s)
+ {
+ for (int i = 0; i < s.len; i++) {
+ s.data[i] = i * 2;
+ }
+ }
+
+ // Modify host data
+ for (int i = 0; i < s.len / 2; i++) {
+ s.data[i * 2] = i + 100;
+ }
+
+ // Update to device with expression-based count
+#pragma omp target data map(to : s)
+ {
+#pragma omp target update to(s.data[0 : s.len / 2 : 2])
----------------
amitamd7 wrote:
Thanks for pointing. I was not completely aware of the `alloc` keyword.
https://github.com/llvm/llvm-project/pull/181987
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