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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - slp-vectorizer cannot terminate"
href="https://bugs.llvm.org/show_bug.cgi?id=41289">41289</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>slp-vectorizer cannot terminate
</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=21696" name="attach_21696" title=".bc file of the source code">attachment 21696</a> <a href="attachment.cgi?id=21696&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 -gvn -structurizecfg small.bc -o small-opt.bc
$opt -slp-vectorizer small-opt.bc
In this step, opt will consume too much memory and not terminate.
By using godbolt, it shows that the llvm 6/7/truck version also has this
problem.
-----------------------------------------
struct {
int a;
int b;
int c
} * d, e, f, g, h;
fn1() {
int j;
int k;
int l;
int m;
n : {
int o;
p:
if (j)
for (; e.a;) {
int q;
for (; h.c;) {
int i;
if (k)
goto p;
if (l)
for (; 2; i)
return o;
}
}
int r;
if (m)
aa:
if (0 & r && 0)
for (; 0;) {
int a;
for (; 0;) {
if (a)
goto n;
for (; f.c; f)
goto aa;
}
for (; 0;)
for (; g.b; 1)
return d;
}
}
}</pre>
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