<html>
<head>
<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - USM not working"
href="https://bugs.llvm.org/show_bug.cgi?id=49874">49874</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>USM not working
</td>
</tr>
<tr>
<th>Product</th>
<td>OpenMP
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Clang Compiler Support
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>itaru.kitayama@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>```
#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.</pre>
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