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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SelectionDAGBuilder] Bad machine code: MBB has duplicate entries in its successor list"
href="https://bugs.llvm.org/show_bug.cgi?id=50874">50874</a>
</td>
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<tr>
<th>Summary</th>
<td>[SelectionDAGBuilder] Bad machine code: MBB has duplicate entries in its successor list
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</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>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Common Code Generator Code
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>paulsson@linux.vnet.ibm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>int a;
volatile unsigned b;
short c;
long d;
void e() {
f:
b;
g:
if (a)
;
else {
int h;
if (d)
goto f;
if (c)
goto g;
}
}
void main() {}
clang -O3 -march=arch13 -o a.out -w -mllvm -available-load-scan-limit=12 -mllvm
-disable-cgp-branch-opts -mllvm -verify-machineinstrs
# After Instruction Selection
*** Bad machine code: MBB has duplicate entries in its successor list. ***
- function: e
- basic block: %bb.10 f (0x2aa456acfc8)
or with llc:
define void @e() {
bb:
switch i32 undef, label %bb1 [
i32 0, label %bb2
i32 2, label %bb2
i32 3, label %bb2
]
bb1: ; preds = %bb
br label %bb2
bb2: ; preds = %bb1, %bb, %bb, %bb
ret void
}
llc -mcpu=arch13 -O3 -disable-cgp-branch-opts -verify-machineinstrs
*** Bad machine code: MBB has duplicate entries in its successor list. ***</pre>
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