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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [AArch64] MachineInstr verifier fails due to nested ADJCALLSTACK"
href="http://llvm.org/bugs/show_bug.cgi?id=17674">17674</a>
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<th>Summary</th>
<td>[AArch64] MachineInstr verifier fails due to nested ADJCALLSTACK
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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>All
</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>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: ARM
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>amara.emerson@gmail.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=11419" name="attach_11419" title="Test case">attachment 11419</a> <a href="attachment.cgi?id=11419&action=edit" title="Test case">[details]</a></span>
Test case
When attempting to codegen the attached test case using llc -march=aarch64
-verify-machineinstrs we get a verifier fault ending with:
*** Bad machine code: FrameSetup is after another FrameSetup ***
- function: ch63
- basic block: BB#0 entry (0x1c98900)
- instruction: ADJCALLSTACKDOWN 0, %XSP<imp-def,dead>, %XSP<imp-use>
*** Bad machine code: FrameDestroy is not after a FrameSetup ***
- function: ch63
- basic block: BB#0 entry (0x1c98900)
- instruction: ADJCALLSTACKUP 0, 0, %XSP<imp-def,dead>, %XSP<imp-use>
LLVM ERROR: Found 2 machine code errors.
Filing as a bug since the AArch64 backend should emit verifier-friendly code.</pre>
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