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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ".arch_extensions crypto" doesn't work as intended"
href="https://bugs.llvm.org/show_bug.cgi?id=49048">49048</a>
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<th>Summary</th>
<td>".arch_extensions crypto" doesn't work as intended
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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>All
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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>martin@martin.st
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<th>CC</th>
<td>arnaud.degrandmaison@arm.com, llvm-bugs@lists.llvm.org, sander.desmalen@arm.com, smithp352@googlemail.com, Ties.Stuij@arm.com
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<p>
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<pre>When enabling the extension "crypto" via e.g. ".arch armv8-a+crypto", this
enables a number of other extensions, including aes and sha2. When enabling it
via ".arch_extension crypto", these other extensions aren't enabled.
Repro case:
$ cat test.s
.arch_extension crypto
pmull v2.1q, v2.1d, v1.1d
$ aarch64-linux-gnu-as -c test.s
$ clang -target aarch64-linux-gnu -c test.s
test.s:2:1: error: instruction requires: aes
pmull v2.1q, v2.1d, v1.1d
^
While the corresponding case with .arch works fine:
$ cat test2.s
.arch armv8-a+crypto
pmull v2.1q, v2.1d, v1.1d
$ clang -target aarch64-linux-gnu -c test2.s
These other extensions are enabled via the ExpandCryptoAEK [1] function in e.g.
parseDirectiveArch, but that function isn't called in
parseDirectiveArchExtension. It'd be trivial to fix if we'd have a reference to
the AArch64::ArchKind which is in effect - but do we have that somewhere?
[1]
<a href="https://github.com/llvm/llvm-project/blob/main/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp#L5361-L5376">https://github.com/llvm/llvm-project/blob/main/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp#L5361-L5376</a></pre>
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</p>
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