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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [AArch64] __builtin_readcyclecounter() lead to illegal hardware instruction"
href="https://bugs.llvm.org/show_bug.cgi?id=44307">44307</a>
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<th>Summary</th>
<td>[AArch64] __builtin_readcyclecounter() lead to illegal hardware instruction
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>9.0
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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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>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>jaron@kent-dobias.com
</td>
</tr>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>On my AArch64 machine (Pinebook) running Archlinux ARM, clang compiles
__builtin_readycyclecounter() but the resulting binaries crash with an illegal
hardware instruction. I'm using the version of clang packaged by Archlinux ARM.
Information on the Pinebook processor:
<a href="https://www.arm.com/products/processors/cortex-a/cortex-a53-processor.php">https://www.arm.com/products/processors/cortex-a/cortex-a53-processor.php</a>
Steps to reproduce:
% cat buildcyclecounter.c
int main(int argc, char* argv[]) {
#if __has_builtin(__builtin_readcyclecounter)
return __builtin_readcyclecounter();
#else
# error "__builtin_readcyclecounter not available"
#endif
}
% clang buildcyclecounter.c
% ./a.out
[1] 19966 illegal hardware instruction (core dumped) ./a.out
System information:
% uname -a :(
Linux HAL 5.4.3-1-ARCH #1 SMP Sat Dec 14 22:09:49 EST 2019 aarch64 GNU/Linux
% clang -v
clang version 9.0.0 (tags/RELEASE_900/final)
Target: aarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation:
/usr/bin/../lib/gcc/aarch64-unknown-linux-gnu/8.3.0
Found candidate GCC installation: /usr/lib/gcc/aarch64-unknown-linux-gnu/8.3.0
Selected GCC installation: /usr/bin/../lib/gcc/aarch64-unknown-linux-gnu/8.3.0
Candidate multilib: .;@m64
Selected multilib: .;@m64</pre>
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