[Bug 783931] New: ORC does not preserve XMM6:XMM15 registers

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783931

            Bug ID: 783931
           Summary: ORC does not preserve XMM6:XMM15 registers
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Windows
            Status: NEW
          Severity: major
          Priority: Normal
         Component: orc
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: matej.knopp at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: ds at schleef.org
     GNOME version: ---

MSVC stores floating point numbers in XMM6. XMM6:XMM15 are supposed to be non
volatile in MSVC: https://msdn.microsoft.com/en-us/library/9z1stfyw.aspx

There is code in orc that marks them as saved, but I don't see any code that
actually emits code to save them.

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