[Bug target/58416] Incorrect x87-based union copying code

[jamborm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58416

Martin Jambor <jamborm at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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  Attachment #58724|0                           |1
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--- Comment #24 from Martin Jambor <jamborm at gcc dot gnu.org> ---
Created attachment 58752
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58752&action=edit
Another wip patch

To give sort-of a status update, this is the current state of my WIP fix.  It
clearly needs more thinking about the reverse storage cases and still fails
g++.dg/vect/pr64410.cc - but I'm afraid that would require a target hook to
identify problematic FP modes.  Otherwise it passes bootstrap and testsuite on
x86_64-linux.