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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - compile-time explosion at -O2 and -O3 on clang trunck version"
href="https://bugs.llvm.org/show_bug.cgi?id=50254">50254</a>
</td>
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<tr>
<th>Summary</th>
<td>compile-time explosion at -O2 and -O3 on clang trunck version
</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>normal
</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>haoxintu@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Hi all.
$cat small.c
#include <stdint.h>
int a, b;
uint64_t c;
void d() {
static e;
int16_t *f = &e;
int8_t *g = &b;
int32_t *i = &a;
for (*g = 9; *g; *g += 1) {
int8_t j = 174;
c += 0xE3CDB098 ^ ((*f ^= *i) ^ (127 | j));
}
}
$clang -w -O2 small.c
//endless compling
$clang -w -O3 small.c
//endless compling
$clang -v
clang version 13.0.0 (<a href="https://github.com/llvm/llvm-project">https://github.com/llvm/llvm-project</a>
e5984a3680bef22d422beaafa73bf131d7197973)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir:
/home/haoxin/haoxin-data/dut-research/compilers/llvm-project/build-20210502/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
Reproduced in Godbolt: <a href="https://godbolt.org/z/czvKeK454">https://godbolt.org/z/czvKeK454</a>
Thanks,
Haoxin</pre>
</div>
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