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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - compile-time explosion at -O1 on clang trunk version"
href="https://bugs.llvm.org/show_bug.cgi?id=51762">51762</a>
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</tr>
<tr>
<th>Summary</th>
<td>compile-time explosion at -O1 on clang trunk 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>
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<pre>Hi all.
The following valid program makes the trunk version of clang hang at -O1.
$cat small.c
#include <stdint.h>
int a, c, d, e, f;
int16_t b;
void g() {
uint64_t i;
uint64_t *r = &i;
int16_t j;
uint64_t *k;
uint64_t **l = &r;
for (; *k;) {
int32_t *m = d;
if (e ? **l = c : 0) {
int16_t n;
int32_t o = d;
if (a)
m = *l;
for (n = 4; n; *m = o)
;
int16_t *p = j;
q:
j = *p;
}
}
if (*r /= (b % *r || 0 == *r) % (f += d >= b))
goto q;
}
$clang -w -O1 small.c
//endless compiling
$clang -v
clang version 14.0.0 (<a href="https://github.com/llvm/llvm-project">https://github.com/llvm/llvm-project</a>
fa69ccd189694d0b992323738443ac05a2bcb9ca)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/haoxin/haoxin-data/compilers/llvm-project/build/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
Thanks,
Haoxin</pre>
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