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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 - wrong code with "-early-cse-memssa -jump-threading -loop-unroll -correlated-propagation -dse""
href="https://bugs.llvm.org/show_bug.cgi?id=48456">48456</a>
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<tr>
<th>Summary</th>
<td>wrong code with "-early-cse-memssa -jump-threading -loop-unroll -correlated-propagation -dse"
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</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>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>suochenyao@163.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24254" name="attach_24254" title="bc file">attachment 24254</a> <a href="attachment.cgi?id=24254&action=edit" title="bc file">[details]</a></span>
bc file
*******************************************************************************
OS and Platform:
CentOS Linux release 7.8.2003 (Core), x86_64 GNU/Linux
*******************************************************************************
Program:
$ cat a.c
int printf(const char *, ...);
int a=0;
static int b(int *c) {
char d;
int e, f;
int g[1];
f = 0;
for (; f < 1; f++)
g[f] = 0;
*c = g[0];
}
int main() {
int e;
int *h = &a;
b(h);
printf("%d\n", a);
}
*******************************************************************************
clang version:
$ clang --version
clang version 12.0.0 (/home/suocy/src/llvm-dev/llvm-project/llvm/tools/clang
64e7685368894742517524878716184a8cd3ba9b)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/suocy/bin/llvm-dev/bin
*******************************************************************************
Command Lines:
$ clang -c -emit-llvm -O3 -mllvm -disable-llvm-optzns a.c -o a.bc
a.c:11:1: warning: non-void function does not return a value [-Wreturn-type]
}
^
1 warning generated.
$ opt a.bc -o a.opt1.bc
$ opt -early-cse-memssa -jump-threading -loop-unroll -correlated-propagation
-dse a.bc -o a.opt2.bc
$ clang a.opt1.bc -o a1.o
$ clang a.opt2.bc -o a2.o
$ ./a1.o
0
$ ./a2.o
32767</pre>
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