<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 - 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>
        </div>
      </p>


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