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<body><span class="vcard"><a class="email" href="mailto:rnk@google.com" title="Reid Kleckner <rnk@google.com>"> <span class="fn">Reid Kleckner</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - Bad code generation on i686 w/ inline assembly and -mstackrealign"
href="http://llvm.org/bugs/show_bug.cgi?id=22068">bug 22068</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>rnk@google.com
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>DUPLICATE
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - Bad code generation on i686 w/ inline assembly and -mstackrealign"
href="http://llvm.org/bugs/show_bug.cgi?id=22068#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - Bad code generation on i686 w/ inline assembly and -mstackrealign"
href="http://llvm.org/bugs/show_bug.cgi?id=22068">bug 22068</a>
from <span class="vcard"><a class="email" href="mailto:rnk@google.com" title="Reid Kleckner <rnk@google.com>"> <span class="fn">Reid Kleckner</span></a>
</span></b>
<pre>This is a known issue with our stack realignment that happens with rbx on x64.
I ran into and tried to make us fatal error in these situations:
<a href="http://reviews.llvm.org/D1317">http://reviews.llvm.org/D1317</a>
I'm going to dupe this against PR16830, since it's older and basically the same
problem. The core issue is that aligned stack space with a moving SP requires
three pointers to the stack:
- ebp to reference args in memory
- esp to handle calls and dynamic allocas
- "base pointer" (currently esi/rbx) to reference the aligned space
Keeping ebp where it is also keeps a reference to the return address, which is
good for frame pointer based unwinders.
*** This bug has been marked as a duplicate of <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - MS inline asm conflicts with base pointer register"
href="show_bug.cgi?id=16830">bug 16830</a> ***</pre>
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