https://bugs.llvm.org/show_bug.cgi?id=49874
Bug ID: 49874
Summary: USM not working
Product: OpenMP
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Clang Compiler Support
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
```
#include <iostream>
#include <omp.h>
//#pragma omp requires unified_shared_memory
#define N 1024
void func(int p[N]) {
std::cout << p << std::endl;
std::cout << &p << std::endl;
#pragma omp target
{
for (int i = 0; i < N; i++) {
p[0] = 123456;
}
}
std::cout << p[0] << std::endl;
}
int main() {
int a[N] = {0};
std::cout << a << std::endl;
std::cout << &a << std::endl;
#pragma omp target
{
for (int i = 0; i < N; i++) {
a[0] = 123456;
}
}
std::cout << a[0] << std::endl;
func(a);
int *b = new int[N];
std::cout << b << std::endl;
std::cout << &b << std::endl;
#pragma omp target
{
for (int i = 0; i < N; i++) {
b[0] = 123456;
}
}
std::cout << b[0] << std::endl;
func(b);
return 0;
}
```
The above test code in C++ fails at runtime on an A100 target.
The Linux kernel is enabled HMM, which is necessary for USM to work.
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