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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Wrong IR emitted for "target enter data" with dependences"
href="https://bugs.llvm.org/show_bug.cgi?id=47126">47126</a>
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<th>Summary</th>
<td>Wrong IR emitted for "target enter data" with dependences
</td>
</tr>
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<th>Product</th>
<td>OpenMP
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Clang Compiler Support
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>rofirrim@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Hi all,
the following test is failing in x86-64
libomptarget :: offloading/target_depend_nowait.cpp
The following small reproducer seems to show the issue
// -- t.cpp
#include <omp.h>
#include <stdio.h>
#define N 1024
int A[N];
int main() {
#pragma omp target enter data map(to:A) depend(out:A[0])
}
// -- end of t.cpp
For reference this is the compilation line
clang++ \
-fopenmp \
-pthread \
-fno-experimental-isel \
-I /work/llvm-src/openmp/libomptarget/test \
-I
/work/llvm-build-debug/runtimes/runtimes-bins/openmp/libomptarget/../runtime/src
\
-fopenmp-targets=x86_64-pc-linux-gnu \
t.cpp \
-S -emit-llvm \
-o t.ll
The generated IR contains a memcpy with a source from null pointer.
%20 = getelementptr inbounds %struct..kmp_privates.t, %struct..kmp_privates.t*
%11, i32 0, i32 3
%21 = bitcast [1 x i8*]* %20 to i8*
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %21, i8* align 8 null, i64 8,
i1 false) ; <-- bug?
Kind regards,</pre>
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