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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/106743] Illegal assembly code with -march=skylake
Date: Thu, 25 Aug 2022 19:35:33 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106743

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The inline-asm is wrong.
It should be:
                __asm__("xchgb %b0, %h0 ## %0 " : "=3DQ"(__tmp) : "0"(__tmp=
));


q
Any register accessible as rl. In 32-bit mode, a, b, c, and d; in 64-bit mo=
de,
any integer register.

Q
Any register accessible as rh: a, b, c, and d.

Because you are accessing it as rh so you need to Q rather than q.=