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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 -O2"
href="https://bugs.llvm.org/show_bug.cgi?id=49788">49788</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>compile-time explosion at -O2
</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.
The program, small.c, makes clang hang on in the current trunk version of
clang.
By the way, I am not sure the "f(e)" in function "void l(){f(e);}" is valid or
not, but this program can be compiled in GCC or other versions or options of
clang.
$cat small.c
#include <stdint.h>
int a, b, c, d;
int e();
int e(){return 1;}
void f() {
uint8_t g;
for (; g <= 6;)
g;
}
void l() { f(e); }
void i() {
uint8_t *k = &d;
int64_t *j = b;
for (*k = 5; *k <= 89; *k += 1)
if (a - (c *= *j))
l();
}
$clang -v
clang version 13.0.0 (<a href="https://github.com/llvm/llvm-project">https://github.com/llvm/llvm-project</a>
5127da029194bbe32421c336b6f249241b658a2b)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/tuhaoxin/github/llvm-project/build-20210330/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/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/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
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
Selected multilib: .;@m64
Reproduce on Godbolt: <a href="https://godbolt.org/z/ja7M55W6h">https://godbolt.org/z/ja7M55W6h</a>
Thanks,
Haoxin</pre>
</div>
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