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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - PAC+BTI+B-KEY inefficient codegen"
href="https://bugs.llvm.org/show_bug.cgi?id=49957">49957</a>
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<th>Summary</th>
<td>PAC+BTI+B-KEY inefficient codegen
</td>
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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
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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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>eugeni.stepanov@gmail.com
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</tr>
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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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<p>
<div>
<pre>int f() {
g();
return 42;
}
With -mbranch-protection=standard,
_Z1fv():
0: d503233f paciasp
4: a9bf7bfd stp x29, x30, [sp, #-16]!
With -mbranch-protection=bti+pac-ret+b-key,
_Z1fv():
0: d503245f bti c
4: d503237f pacibsp
8: a9bf7bfd stp x29, x30, [sp, #-16]!
Seems trivial, AArch64BranchTargets::addBTI needs to skip over EMITBKEY.</pre>
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