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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 - taking address of function is not allowed enabling __cl_clang_function_pointers"
href="https://bugs.llvm.org/show_bug.cgi?id=49264">49264</a>
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<th>Summary</th>
<td>taking address of function is not allowed enabling __cl_clang_function_pointers
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>matteo.concas@cern.ch
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<pre>Created <span class=""><a href="attachment.cgi?id=24553" name="attach_24553" title="Makefile with reproducer and workaround files">attachment 24553</a> <a href="attachment.cgi?id=24553&action=edit" title="Makefile with reproducer and workaround files">[details]</a></span>
Makefile with reproducer and workaround files
LSB Release:
LSB Version:
:core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch
Distributor ID: CentOS
Description: CentOS Linux release 8.3.2011
Release: 8.3.2011
Codename: n/a
Clang version:
clang version 13.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
a874d182c61c7f8e5291c718b40be0e133bf21f0)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/clang/bin
Issue:
Passing a static constexpr function as an argument to another function as done
here (see reproducer.cl in attached archive):
namespace namespace row_offsets_utils
{
[omitted, see attached files for full reproducer]
template <int I0, class F, int... I>
constexpr auto do_make(F f, indices<I...>) -> o2::gpu::gpustd::array<int,
sizeof...(I)>
{
o2::gpu::gpustd::array<int, sizeof...(I)> retarr = {f(I0 + I)...};
return retarr;
}
template <int N, int I0 = 0, class F>
constexpr auto make(F f) -> o2::gpu::gpustd::array<int, N>
{
return do_make<I0>(f, typename make_indices<N>::type());
}
}
template <class T, unsigned int D>
class MatRepSymGPU
{
[omitted, see attachd files for full reproducer]
static constexpr int off1(int i) { return off2(i / D, i % D); }
static int off(int i)
{
static constexpr auto v = row_offsets_utils::make<D * D>(off1);
return v[i];
}
};
breaks compilation with:
error: taking address of function is not allowed
static constexpr auto v = row_offsets_utils::make<D * D>(off1);
^
1 error generated.
I know this is not supported by OpenCL itself, but I had expected it to work
with __cl_clang_function_pointers, particularly since the slightly modified
version of the code compiles (see workaround.cl in attached archive).</pre>
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