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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - AArch64 inline asm does not recognise Q registers in clobber list"
href="https://bugs.llvm.org/show_bug.cgi?id=50750">50750</a>
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<th>Summary</th>
<td>AArch64 inline asm does not recognise Q registers in clobber list
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: AArch64
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>david.spickett@linaro.org
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<th>CC</th>
<td>arnaud.degrandmaison@arm.com, llvm-bugs@lists.llvm.org, smithp352@googlemail.com, Ties.Stuij@arm.com
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<div>
<pre>Compiling the following for AArch64:
void foo(void) {
__asm __volatile("" : : : "v0");
__asm __volatile("" : : : "q0");
}
Produces this error:
<source>:3:31: error: unknown register name 'q0' in asm
__asm __volatile("" : : : "q0");
^
The same example does not error with GCC.
<a href="https://godbolt.org/z/zMdqP9qdo">https://godbolt.org/z/zMdqP9qdo</a>
Using "v0" instead works and has the same effect but we should recognise the
other naming schemes.
<a href="https://developer.arm.com/documentation/den0024/a/ARMv8-Registers/NEON-and-floating-point-registers/Scalar-register-sizes">https://developer.arm.com/documentation/den0024/a/ARMv8-Registers/NEON-and-floating-point-registers/Scalar-register-sizes</a>
Clang does not recognise "h", "b" or "q" where GCC does.</pre>
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