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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/109903] Register misallocation in hand-crafted asm insn,
 no diagnostics produced
Date: Thu, 18 May 2023 15:04:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109903

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
That is the inline-asm should be written as:

  asm ("mrs %[_1], pmccntr_eli0\n"
       "\tldr x1, [%[_2]]\n"
       : [_1] "=3D&r" (v)
       : [_2] "r" (a)
       : "memory");

Note since a is memory address you are writing to you should also add the
memory clobber to the inline-asm.=