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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - SSE2 based memcpy is disabled for Win7/64b"
href="https://bugs.freedesktop.org/show_bug.cgi?id=37457#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - SSE2 based memcpy is disabled for Win7/64b"
href="https://bugs.freedesktop.org/show_bug.cgi?id=37457">bug 37457</a>
from <span class="vcard"><a class="email" href="mailto:fziglio@redhat.com" title="Frediano Ziglio <fziglio@redhat.com>"> <span class="fn">Frediano Ziglio</span></a>
</span></b>
<pre>This refers to code in xddm/display/res.c, see _asm usage. The inlined assembly
code should/can be fixed.
See
<a href="https://msdn.microsoft.com/en-us/library/windows/hardware/ff565388(v=vs.85).aspx">https://msdn.microsoft.com/en-us/library/windows/hardware/ff565388(v=vs.85).aspx</a>
("Using Floating Point in a WDM Driver") and
<a href="https://msdn.microsoft.com/en-us/library/windows/hardware/ff545910(v=vs.85).aspx">https://msdn.microsoft.com/en-us/library/windows/hardware/ff545910(v=vs.85).aspx</a>
("Using extended processor features in Windows drivers"). Basically if you just
use SSE there is no need to save/restore state manually.
I'm not sure the performance gain. New processor have really optimized "rep
movsb" implementations supporting all cases.</pre>
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