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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/98648] Failure to optimize out no-op vector operation
 using andnot
Date: Thu, 14 Jan 2021 10:58:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98648

Hongtao.liu <crazylht at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |crazylht at gmail dot com

--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> ---
It looks like not an ABI issue, but gcc didn't simplify for vector all one =
bits
for floating point.

.277r.combine

Trying 6 -> 7:
    6: r85:V4SF=3Dconst_vector
    7: r84:V4SF=3D~r85:V4SF&r87:V4SF
      REG_DEAD r87:V4SF
      REG_DEAD r85:V4SF
Failed to match this instruction:
(set (reg:V4SF 84)
    (and:V4SF (reg:V4SF 87)
        (const_vector:V4SF [
                (const_double:SF -QNaN [-QNaN]) repeated x4
            ])))

When NAN is all ones(which is situation here), it should be simplified to (=
set
(reg:V4SF 84) (reg: V4SF 87))=