pdhaliwal added a comment.
I modified the declare_mapper_target to print the contents of array after
target region and found the following output:
2 3 4 5 6 7 8 9 10 11 Sum = 65
Program:
#include <cstdio>
#include <cstdlib>
#define NUM 10
int main() {
int *c= new int[NUM];
for (int i = 0; i < NUM; i++) {
c[i] = 1;
}
#pragma omp target teams distribute parallel for map(tofrom: c[0:NUM])
for (int i = 0; i < NUM; i++) {
c[i]++;
}
int sum = 0;
for (int i = 0; i < NUM; i++) {
sum += c[i];
printf("%d ", c[i]);
}
// CHECK: Sum = 2048
printf("Sum = %d\n", sum);
return 0;
}
Different variant of the same program is producing correct output,
#include <cstdio>
#include <cstdlib>
#define NUM 10
int main() {
int *c= new int[NUM];
for (int i = 0; i < NUM; i++) {
c[i] = 1;
}
int *b = new int[NUM];
#pragma omp target teams distribute parallel for map(tofrom: c[0:NUM],
b[0:NUM])
for (int i = 0; i < NUM; i++) {
b[i] = c[i] + 1;
}
int sum = 0;
for (int i = 0; i < NUM; i++) {
sum += b[i];
printf("%d ", b[i]);
}
// CHECK: Sum = 2048
printf("Sum = %d\n", sum);
return 0;
}
Output (this is the right answer):
2 2 2 2 2 2 2 2 2 2 Sum = 20
On internal amd-stg-open branch, this patch works fine, so issue is only with
the trunk.
I compared the generated IR before and after applying this patch, I didn't see
anything suspicious. (but can't be 100% sure).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D102107/new/
https://reviews.llvm.org/D102107
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