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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - BranchFolder code falls of the beginning of the list."
href="http://llvm.org/bugs/show_bug.cgi?id=16189">16189</a>
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<th>Summary</th>
<td>BranchFolder code falls of the beginning of the list.
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<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>
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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>Common Code Generator Code
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>micah.villmow@amd.com
</td>
</tr>
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<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>// Check all successors to see if we can move this block before it.
for (MachineBasicBlock::succ_iterator SI = MBB->succ_begin(),
E = MBB->succ_end(); SI != E; ++SI) {
// Analyze the branch at the end of the block before the succ.
MachineBasicBlock *SuccBB = *SI;
MachineFunction::iterator SuccPrev = SuccBB; --SuccPrev;
This code is incorrect if you branch to the entry block of a function. SuccBB
points to the block with ID0, and --SuccPrev moves before this, triggering the
assertion here:
/net/pc172/local_disk/mvillmow/swtrunk/llvm/include/llvm/ADT/ilist.h:214:
llvm::ilist_iterator<NodeTy>& llvm::ilist_iterator<NodeTy>::operator--() [with
NodeTy = llvm::MachineBasicBlock, llvm::ilist_iterator<NodeTy> =
llvm::ilist_iterator<llvm::MachineBasicBlock>]: Assertion `NodePtr && "--'d off
the beginning of an ilist!"' failed.</pre>
</div>
</p>
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