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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 - Assertion `OuterLoop->isLCSSAForm(*DT) && "Outer loop not left in LCSSA form after loop interchange!"' failed"
href="https://bugs.llvm.org/show_bug.cgi?id=45743">45743</a>
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<tr>
<th>Summary</th>
<td>Assertion `OuterLoop->isLCSSAForm(*DT) && "Outer loop not left in LCSSA form after loop interchange!"' failed
</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>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Loop Optimizer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>balarishi.bhogadi@amd.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>The below issue was introduced in trunk in March 2nd week.
$ cat foo.c
int a, c, d, e;
int b[2][10];
void fn1() {
for (; c; c++) {
e = 0;
for (; e; e++)
;
d = 5;
for (; d; d--)
a |= b[d][c + 9];
}
}
$ clang -c -O2 -mllvm -enable-loopinterchange foo.c
clang:
/home/llvm-trunk/llvm-project/llvm/lib/Transforms/Scalar/LoopInterchange.cpp:586:
bool {anonymous}::LoopInterchange::processLoop({anonymous}::LoopVector,
unsigned int, unsigned int, llvm::BasicBlock*, std::vector<std::vector<char,
std::allocator<char> > >&): Assertion `OuterLoop->isLCSSAForm(*DT) && "Outer
loop not left in LCSSA form after loop interchange!"' failed.
PLEASE submit a bug report to <a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> and include the crash
backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /home/llvm-trunk/bin/clang -c -O2 -mllvm
-enable-loopinterchange foo.c
1. <eof> parser at end of file
2. Per-module optimization passes
3. Running pass 'CallGraph Pass Manager' on module 'foo.c'.
4. Running pass 'Loop Pass Manager' on function '@fn1'
5. Running pass 'Interchanges loops for cache reuse' on basic block
'%for.cond1.preheader'
...
...
...</pre>
</div>
</p>
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