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From: "ramana at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/67718] [aarch64] long double incorrect code for copysign
Date: Wed, 30 Sep 2015 02:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67718

Ramana Radhakrishnan <ramana at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2015-09-30
                 CC|                            |ramana at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #3 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> ---
With the latest build for aarch64-none-linux-gnu of 4.9 and trunk that I had
lying around, I see with -O2 and with and without a variety of tuning options,
which looks a whole load better than the original bug report.

copysignl:
        fmov    x2, d0
        fmov    x1, v1.d[1]
        fmov    x3, v0.d[1]
        fmov    d0, x2
        lsr     x1, x1, 63
        bfi     x3, x1, 63, 1
        fmov    v0.d[1], x3
        ret
        .size   copysignl, .-copysignl
        .ident  "GCC: 4.9.4 20150924 (prerelease)"

I am traveling currently and can't dig any further but I remember something
being fixed in this pattern with respect to early clobbers- Aha PR61633 may be
your friend.

Can you check if you have the fix for PR61633 in your 4.9 based tree ? 

In the future please report with command line options and the exact upstream
source revision used to create the issue.

regards
Ramana