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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 - [licm] LICM cannot terminate"
href="https://bugs.llvm.org/show_bug.cgi?id=41291">41291</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[licm] LICM 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=21700" name="attach_21700" title=".bc file of the source code">attachment 21700</a> <a href="attachment.cgi?id=21700&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 -structurizecfg -reg2mem small.bc -o small-opt.bc
$opt -licm small-opt.bc
In this step, opt will consume too much memory and not terminate.
By using godbolt, it shows that the llvm 7/truck version also has this problem.
/compiler-explorer/c-preload/compiler-wrapper: line 21: 22186 Killed
"$@"
Compiler returned: 137
---------------------------------------
struct S0 {
int f2;
int f5;
int e
};
struct f {};
union U4 {
int f0;
};
a;
union U4 *b;
struct S0 g_1231;
g_1237;
struct S0 c;
struct S0 d;
func_1_i;
union U4 i() {
int j;
for (0; a; a)
if (0) {
int l_3671;
for (; 0;) {
for (; func_1_i; func_1_i) {
struct S0 l_3685;
for (; 0;) {
int l_3678;
if ((g(0, 0)))
for (; 0; g_1237) {
union U4 h;
return h;
}
}
}
}
union U4 *l_3860;
lbl_4065:
for (; 0;) {
struct f l_4102;
for (; 0;) {
const l_3993;
for (; 0;) {
int l_4111;
if ((j))
for (; 0; g_1231)
return (*l_3860);
}
}
for (; 0;)
for (d.f2; 0; d)
for (0; 0; c.f5 -= 1) {
return (*b);
}
}
}
}
int main(int argc, char *argv[]) {}</pre>
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