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<body><span class="vcard"><a class="email" href="mailto:jfonseca@vmware.com" title="José Fonseca <jfonseca@vmware.com>"> <span class="fn">José Fonseca</span></a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - (bisected) 32bit UrbanTerror 4.1 timedemo sse4.1 segfault..."
href="https://bugs.freedesktop.org/show_bug.cgi?id=86788">bug 86788</a>
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<td>jfonseca@vmware.com
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - (bisected) 32bit UrbanTerror 4.1 timedemo sse4.1 segfault..."
href="https://bugs.freedesktop.org/show_bug.cgi?id=86788#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - (bisected) 32bit UrbanTerror 4.1 timedemo sse4.1 segfault..."
href="https://bugs.freedesktop.org/show_bug.cgi?id=86788">bug 86788</a>
from <span class="vcard"><a class="email" href="mailto:jfonseca@vmware.com" title="José Fonseca <jfonseca@vmware.com>"> <span class="fn">José Fonseca</span></a>
</span></b>
<pre><span class="quote">> ./ioUrbanTerror.i386</span >
[..]
<span class="quote">> unsigned vec_count __attribute__ ((aligned (16)));</span >
This won;'t work on 32-bits unless you use -mstackrealign or
-mincoming-stack-boundary=2.
This is because some years ago gcc started to assume the stack alignment is
16-bytes. But old applications were still built with 4-byte stack aligment.
And because Mesa drivers can't get to choose, they must assume the worst, ie. 4
bytes stack alignment.
BTW, wefore we start investing on custom SSE code paths, we really should be
using -mfpmath=sse on Linux 32bits too. It's recommend by Intel and the
default on MSVC.</pre>
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