<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [OpenMP 4.5] Array segment mapping to device with default length (e.g. map(array[1:]) ) fails at runtime"
href="https://bugs.llvm.org/show_bug.cgi?id=34582">34582</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[OpenMP 4.5] Array segment mapping to device with default length (e.g. map(array[1:]) ) fails at runtime
</td>
</tr>
<tr>
<th>Product</th>
<td>OpenMP
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</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>josem@udel.edu
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=19149" name="attach_19149" title="Reproducible for array_segment bug">attachment 19149</a> <a href="attachment.cgi?id=19149&action=edit" title="Reproducible for array_segment bug">[details]</a></span>
Reproducible for array_segment bug
Dear LLVM community,
--- SUMMARY:
This bug affects the OpenMP 4.5 support in LLVM when mapping an array section
with no explicit lenght.
--- MORE INFORMATION:
When trying to map an array section that uses the default length value ([1:]),
but a lower-bound that is different than 0, A runtime error occurs.
According to the OpenMP 4.5 specifications, section 2.4, page 45, line 13:
"When the length is absent, it defaults to the size of the array dimension
minus the lower-bound."
I am attaching a sample code that can be use to reproduce this error.
The error happens when using:
#pragma omp target data map(from: a1d[1:])
backtrace info shows the error comming from
#6 0x00003fffb7ef01f0 in __tgt_target () from (...)/omprtl/lib/libxlsmp.so.1
#7 0x0000000010000efc in fail_on_map () at (...)array_segment_map.c:28
#8 0x000000001000119c in main () at (...)array_segment_map.c:56
--- COMPILATION:
clang -std=c99 -fopenmp -fopenmp-targets=nvptx64-nvida-cuda
array_segment_map.c -o array_segment_map.c.o
--- MACHINE
I tested this in a 64 bit system.
clang version 3.8.0 (ibmgithub:/CORAL-LLVM-Compilers/clang.git
6dec6f47d3868e3c8bf6e9e19a217cb2b459d3d8)
(ibmgithub:/CORAL-LLVM-Compilers/llvm.git
b1d578319dbe65eb1e654c6b4e3d05dfcaa087a6)
Target: powerpc64le-unknown-linux-gnu
Thread model: posix
- Red Hat Enterprise Linux Server 7.3 - CentOS release 7
- POWER8NVL ppc64le
- NVIDIA Tesla P100 GPU</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>