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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - backend(OpenMP target NVPTX): Cannot select: 0x6c60f50: i16,ch = AtomicCmpSwap"
href="https://bugs.llvm.org/show_bug.cgi?id=44219">44219</a>
</td>
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<tr>
<th>Summary</th>
<td>backend(OpenMP target NVPTX): Cannot select: 0x6c60f50: i16,ch = AtomicCmpSwap
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>9.0
</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>OpenMP
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>gcc.j.kelling@hzdr.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<pre>Created <span class=""><a href="attachment.cgi?id=22889" name="attach_22889" title="Temporary files from clang++ (host: preprocessed source .ii, assembly .s; nvptx: preprocessed source .ii))">attachment 22889</a> <a href="attachment.cgi?id=22889&action=edit" title="Temporary files from clang++ (host: preprocessed source .ii, assembly .s; nvptx: preprocessed source .ii))">[details]</a></span>
Temporary files from clang++ (host: preprocessed source .ii, assembly .s;
nvptx: preprocessed source .ii))
Internal error trying to compile C++11 code with OpenMP target-offload for
NVPTX backend, employing #omp atomic directives
Command-line:
clang++ -DALPAKA_ACC_CPU_BT_OMP4_ENABLED -DALPAKA_DEBUG=0 -DBOOST_ALL_NO_LIB
-DCATCH_CONFIG_FAST_COMPILE
-I/home/yn622878/checkout/alpaka/test/common/include
-I/home/yn622878/checkout/alpaka/include -isystem
/home/yn622878/checkout/spack/opt/spack/linux-centos7-broadwell/gcc-9.2.0/boost-1.70.0-dkeb472u6a3pgudl5j4fqw7huosyngp4/include
-isystem /home/yn622878/checkout/alpaka/test/../thirdParty/catch2/include
-fopenmp -fopenmp-targets=nvptx64-nvidia-cuda -O2 -ftemplate-backtrace-limit=0
--save-temps -Weverything -Wno-c++98-compat -Wno-c++98-compat-pedantic
-Wno-disabled-macro-expansion -Wno-global-constructors -Wno-padded
-Wno-extra-semi-stmt -fopenmp=libomp -std=gnu++11 -o
CMakeFiles/atomic.dir/src/AtomicTest.cpp.o -c
/home/yn622878/checkout/alpaka/test/unit/atomic/src/AtomicTest.cpp
Relevant openmp flags are:
-fopenmp -fopenmp-targets=nvptx64-nvidia-cuda
The code compiles without error when these are replaced by
-fopenmp -fopenmp=libomp -fopenmp-targets=x86_64-pc-linux-gnu
(offloading to x86 host).
Error message form clang:
fatal error: error in backend: Cannot select: 0x6c60f50: i16,ch =
AtomicCmpSwap<(load store monotonic monotonic 1 on %ir.135)> 0x6314438,
0x6c60ba8, 0x70cd828, 0x6c60ad8
0x6c60ba8: i64,ch = CopyFromReg 0x6314438, Register:i64 %36
0x70cdea8: i64 = Register %36
0x70cd828: i16,ch = CopyFromReg 0x6314438, Register:i16 %54
0x6a23440: i16 = Register %54
0x6c60ad8: i16 = add 0x70cd828, 0x768ec50
0x70cd828: i16,ch = CopyFromReg 0x6314438, Register:i16 %54
0x6a23440: i16 = Register %54
0x768ec50: i16,ch = CopyFromReg 0x6314438, Register:i16 %52
0x711ec68: i16 = Register %52
In function:
_Z13testAtomicAddIN6alpaka3acc10AccCpuOmp4INSt3__117integral_constantImLm1EEEmEEhEvRKT_PbT0_
clang-9: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 9.0.0 (tags/RELEASE_900/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /rwthfs/rz/SW/UTIL/clang/9.0.0/bin
clang-9: note: diagnostic msg: PLEASE submit a bug report to
<a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> and include the crash backtrace, preprocessed source,
and associated run script.
clang-9: note: diagnostic msg: Error generating preprocessed source(s)</pre>
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