Problems with R3 access, in userland, on POWER8

[vmlemon]

Problems with R3 access, in userland, on POWER8

[vmlemon]

Comparing the two versions of syscalls.h:

[fedora@fedora28 user]$ diff ../user.enryo/include/l4/powerpc64/syscalls.h  include/l4/powerpc64/syscalls.h 
158a159
> //../../include/l4/powerpc64/syscalls.h:180:17: error: address of explicit register variable ‘r3’ requested
164c165,166
<     register L4_Clock_t r3 asm("r3");
---
>     register L4_Word_t r3 asm("r3");// = dest.raw;
>     //register L4_Clock_t r3 asm("r3");
178c180,182
<     return ( r3 );
---
> //	L4_Clock_t rclock = r3;
> //return rclock;
>     return  r3 ;

[vmlemon]

Maybe, a bug in GCC? (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67064)