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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-instsimplify makes function broken with "opt -sroa -loop-rotate -jump-threading -lcssa -loop-instsimplify""
href="https://bugs.llvm.org/show_bug.cgi?id=42860">42860</a>
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</tr>
<tr>
<th>Summary</th>
<td>loop-instsimplify makes function broken with "opt -sroa -loop-rotate -jump-threading -lcssa -loop-instsimplify"
</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=22329" name="attach_22329" title=".bc file of the source code">attachment 22329</a> <a href="attachment.cgi?id=22329&action=edit" title=".bc file of the source code">[details]</a></span>
.bc file of the source code
$clang -v
clang version 10.0.0 (trunk 367076)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/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/7.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$clang -O3 -c -emit-llvm -femit-all-decls -mllvm -disable-llvm-optzns small.c
$opt -sroa -loop-rotate -jump-threading -lcssa -loop-instsimplify small.bc -o
small-opt.bc
PHI nodes must have at least one entry. If the block is dead, the PHI should
be removed!
%h.3.lcssa40 = phi i16
in function g
LLVM ERROR: Broken function found, compilation aborted!
---------------------------------------------------------
int a, b, c, e, f;
char d;
void g() {
short h = 0;
int i, j;
k:
d = h;
l:
for (; 0; c) {
int m;
int *n[10][8][3] = {&i, &m, &b, 0, &b, 0, 0, 0, &j, &b, &a, &a};
long o[8];
for (; e;)
for (; f; f++)
o[f];
for (; 0;) {
int p;
for (;; e)
if (p)
goto k;
}
if (h)
break;
h = 0;
}
goto l;
}</pre>
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