<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Infinitely decreased stack pointer"
href="https://llvm.org/bugs/show_bug.cgi?id=30200">30200</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Infinitely decreased stack pointer
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>3.8
</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>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>llvm@henning-thielemann.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=17185" name="attach_17185" title="LL file for loop with ever decreasing stack pointer">attachment 17185</a> <a href="attachment.cgi?id=17185&action=edit" title="LL file for loop with ever decreasing stack pointer">[details]</a></span>
LL file for loop with ever decreasing stack pointer
I attach a small example of code that I generated programmatically via MCJIT
and optimized with -O1 to simplify it. It is a loop containing some alloca (but
problem remains with malloc/free). When run it crashes if the loop count is big
enough. The generated X86 assembly code looks like the stack pointer is
decremented repeatedly by these instructions:
movq %rsp, %rax
leaq -32(%rax), %rsp</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>