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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - arm_neon.h doesn't support vmull_p64 on aarch32 armv8-a+crypto"
href="https://bugs.llvm.org/show_bug.cgi?id=38628">38628</a>
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<th>Summary</th>
<td>arm_neon.h doesn't support vmull_p64 on aarch32 armv8-a+crypto
</td>
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Headers
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>lennox@cs.columbia.edu
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>According to the ARM C Language Extensions (version 2.1, section 12.3.13,
Crypto Intrinsics):
poly128_t vmull_p64 (poly64_t, poly64_t);
Performs widening polynomial multiplication on double-words low part. Available
on ARMv8 AArch32 and AArch64.
poly128_t vmull_high_p64 (poly64x2_t, poly64x2_t);
Performs widening polynomial multiplication on double-words high part.
Available on ARMv8 AArch32 and AArch64.
However, clang's arm_neon.h incorrectly restricts vmull_p64 support to AArch64
only. (Additionally, it does *not* restrict it to __ARM_FEATURE_CRYPTO).</pre>
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