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// This test checks that #pragma omp target update to(data[0:2:3]) correctly
// updates every third element (stride 3) from the host to the device, partially
// across the array using dynamically allocated memory.
// RUN: %libomptarget-compile-run-and-check-generic
// XFAIL: intelgpu
#include <omp.h>
#include <stdio.h>
#include <stdlib.h>
int main() {
int len = 11;
double *data = (double *)calloc(len, sizeof(double));
// Initialize on host
for (int i = 0; i < len; i++)
data[i] = i;
// Initial values
printf("original host array values:\n");
for (int i = 0; i < len; i++)
printf("%f\n", data[i]);
printf("\n");
#pragma omp target data map(tofrom : data[0 : len])
{
// Initialize device array to 20
#pragma omp target
{
for (int i = 0; i < len; i++)
data[i] = 20.0;
}
// Modify host data for elements that will be updated
data[0] = 10.0;
data[3] = 10.0;
// This creates Host→Device transfer for indices 0,3 only
#pragma omp target update to(data[0 : 2 : 3])
// Verify on device by adding 5 to all elements
#pragma omp target
{
for (int i = 0; i < len; i++)
data[i] += 5.0;
}
}
printf("device array values after update to:\n");
for (int i = 0; i < len; i++)
printf("%f\n", data[i]);
printf("\n");
// CHECK: original host array values:
// CHECK-NEXT: 0.000000
// CHECK-NEXT: 1.000000
// CHECK-NEXT: 2.000000
// CHECK-NEXT: 3.000000
// CHECK-NEXT: 4.000000
// CHECK-NEXT: 5.000000
// CHECK-NEXT: 6.000000
// CHECK-NEXT: 7.000000
// CHECK-NEXT: 8.000000
// CHECK-NEXT: 9.000000
// CHECK-NEXT: 10.000000
// CHECK: device array values after update to:
// CHECK-NEXT: 15.000000
// CHECK-NEXT: 25.000000
// CHECK-NEXT: 25.000000
// CHECK-NEXT: 15.000000
// CHECK-NEXT: 25.000000
// CHECK-NEXT: 25.000000
// CHECK-NEXT: 25.000000
// CHECK-NEXT: 25.000000
// CHECK-NEXT: 25.000000
// CHECK-NEXT: 25.000000
// CHECK-NEXT: 25.000000
free(data);
return 0;
}
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