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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - musttail calls are not allowed to precede unreachable" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D23766&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=qWoYOx-jxFTSa7K7hMMb37fCahH6dTa_-YmPVOlgvZI&s=RKGnUxmCWmyldI1aNC_i5fNwHD-KPD5yrHObSrWmqRo&e=">23766</a>
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<th>Summary</th>
<td>musttail calls are not allowed to precede unreachable
</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>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>kavon.farvardin@gmail.com
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<th>CC</th>
<td>compnerd@compnerd.org, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Consider the following code:
declare void @g() noreturn
define void @f() {
entry:
musttail call void @g() noreturn
unreachable
}
llc rejects this with the following error:
musttail call must be precede a ret with an optional bitcast
musttail call void @g() #0
llc: musttail.ll: error: input module is broken!
A conversation on IRC led to the conclusion that `unreachable` following a
`musttail call` should be permitted.</pre>
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