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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Register clobber information for asm blocks jumped to can be incorrect"
href="http://llvm.org/bugs/show_bug.cgi?id=21035">21035</a>
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<tr>
<th>Summary</th>
<td>Register clobber information for asm blocks jumped to can be incorrect
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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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>
</tr>
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<th>Component</th>
<td>Frontend
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ehsan@mozilla.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Consider this test case:
void f() {
__asm {
mov edx, 1
jmp lbl
}
__asm {
lbl:
mov ecx, 2
}
}
We currently generate the following code:
define void @f() #0 {
entry:
tail call void asm sideeffect inteldialect "mov edx, $$1\0A\09jmp
L__MSASMLABEL_.0__lbl", "~{edx},~{dirflag},~{fpsr},~{flags}"() #1, !srcloc !5
tail call void asm sideeffect inteldialect "L__MSASMLABEL_.0__lbl:\0A\09mov
ecx, $$2", "~{ecx},~{dirflag},~{fpsr},~{flags}"() #1, !srcloc !6
ret void
}
However, the second asm block also clobbers edx, through the jump from the
first one.</pre>
</div>
</p>
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