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<body><span class="vcard"><a class="email" href="mailto:david.majnemer@gmail.com" title="David Majnemer <david.majnemer@gmail.com>"> <span class="fn">David Majnemer</span></a>
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<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Wrong optimization of sprintf"
href="https://llvm.org/bugs/show_bug.cgi?id=27526">bug 27526</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>RESOLVED
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<td style="text-align:right;">Resolution</td>
<td>---
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<td>INVALID
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Wrong optimization of sprintf"
href="https://llvm.org/bugs/show_bug.cgi?id=27526#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Wrong optimization of sprintf"
href="https://llvm.org/bugs/show_bug.cgi?id=27526">bug 27526</a>
from <span class="vcard"><a class="email" href="mailto:david.majnemer@gmail.com" title="David Majnemer <david.majnemer@gmail.com>"> <span class="fn">David Majnemer</span></a>
</span></b>
<pre>GLibc contains the following:
The behavior of this function is undefined if copying takes place between
objects that overlap—for example, if s is also given as an argument to be
printed under control of the ‘%s’ conversion.
<a href="http://www.gnu.org/software/libc/manual/html_mono/libc.html#Formatted-Output-Functions">http://www.gnu.org/software/libc/manual/html_mono/libc.html#Formatted-Output-Functions</a>
The Single Unix Specification Version 4 says the same thing:
If copying takes place between objects that overlap as a result of a call to
sprintf() or snprintf(), the results are undefined.
Therefore, I do not believe that LLVM's behavior is indicative of a bug.</pre>
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