<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - getBasicBlockIndex() returns -1. [LoopUnroller, LoopPeel]"
href="https://bugs.llvm.org/show_bug.cgi?id=33384">33384</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>getBasicBlockIndex() returns -1. [LoopUnroller, LoopPeel]
</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>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Scalar Optimizations
</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>Created <span class=""><a href="attachment.cgi?id=18603" name="attach_18603" title="reduced testcase">attachment 18603</a> <a href="attachment.cgi?id=18603&action=edit" title="reduced testcase">[details]</a></span>
reduced testcase
bin/opt -S -mtriple=s390x-unknown-linux -mcpu=z13 -O3 -o out.opt.ll
unroller_assert.ll
include/llvm/IR/Instructions.h:2764: llvm::Value*
llvm::PHINode::getIncomingValueForBlock(const llvm::BasicBlock*) const:
Assertion `Idx >= 0 && "Invalid basic block argument!"' failed.
Value *getIncomingValueForBlock(const BasicBlock *BB) const {
int Idx = getBasicBlockIndex(BB);
assert(Idx >= 0 && "Invalid basic block argument!");
return getIncomingValue(Idx);
}
p Idx
$184 = -1
[UP]
LoopUnroll.cpp:
PN->replaceAllUsesWith(PN->getIncomingValueForBlock(Preheader));
p Preheader->dump()
entry:
%l_869 = alloca [8 x i32], align 4
br label %for.cond1128.preheader.peel.begin
p L->getLoopPreheader()->dump()
entry.peel.newph: ; preds =
%for.cond1128.preheader.peel.next9
br label %for.cond1128.preheader
Why is Preheader != L->getLoopPreheader() ?
Why is the index for the entry block -1?
Related to peeling?</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>