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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/99434] std::bit_cast generates more instructions than
 __builtin_bit_cast and memcpy with -march=native
Date: Sat, 06 Mar 2021 21:25:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99434

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement
             Target|                            |x86_64
           Keywords|                            |missed-optimization, ra
          Component|tree-optimization           |target

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is just a register allocation issue dealing with mulx and TImode.

If mulq was used instead (that is without -march=3Dnative), all of the func=
tions
are done correctly.=