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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LR not correctly saved for inline assembly clobbering LR"
href="https://bugs.llvm.org/show_bug.cgi?id=47811">47811</a>
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<th>Summary</th>
<td>LR not correctly saved for inline assembly clobbering LR
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>11.0
</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>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: PowerPC
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>programmerjake@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, nemanja.i.ibm@gmail.com
</td>
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<p>
<div>
<pre>The following IR is miscompiled:
<a href="https://gcc.godbolt.org/z/s6c6vT">https://gcc.godbolt.org/z/s6c6vT</a>
target triple = "powerpc64le-unknown-linux-gnu"
define void @f() {
call void asm sideeffect "mtlr 31", "~{lr}"()
ret void
}
Generated Assembly (trimmed to just f()):
f: # @f
.Lfunc_begin0:
.cfi_startproc
# %bb.0:
#APP
mtlr 31
#NO_APP
blr
This causes f to return to whatever address was in r31 instead of to the
caller. I expect LLVM to instead store the return address that was in LR to
another register or to the stack and restore it before returning.</pre>
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