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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 - loop-rotate makes function broken with "opt -licm -loop-rotate -jump-threading -lcssa -loop-rotate""
href="https://bugs.llvm.org/show_bug.cgi?id=42018">42018</a>
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<tr>
<th>Summary</th>
<td>loop-rotate makes function broken with "opt -licm -loop-rotate -jump-threading -lcssa -loop-rotate"
</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>cszide@163.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=22018" name="attach_22018" title=".bc file of the source code">attachment 22018</a> <a href="attachment.cgi?id=22018&action=edit" title=".bc file of the source code">[details]</a></span>
.bc file of the source code
$clang -v
clang version 9.0.0 (trunk 355281)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.3.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$clang -O3 -c -emit-llvm -mllvm -disable-llvm-optzns small.c
$opt -licm -loop-rotate -jump-threading -lcssa -loop-rotate small.bc -o
small-opt.bc
PHI nodes must have at least one entry. If the block is dead, the PHI should
be removed!
%split = phi i32
in function c
LLVM ERROR: Broken function found, compilation aborted!
without loop-rotate pass, opt works fine.
opt -licm -loop-rotate -jump-threading -lcssa small.bc -o small-opt.bc
-----------------------------------------
int a=0, b=0;
c() {
unsigned int d=0;
unsigned short int e=0;
for (; 4;) {
int f=0;
unsigned int g=0;
unsigned int h=0;
unsigned int k=0;
unsigned int l=0;
int i=0, j=0;
for (d = 0; d <= 4; d++) {
for (b = 1; b;)
return e;
for (; a; a++)
f || 3;
}
for (; 0;)
;
}
}</pre>
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