https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109903
--- 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] "=&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.
