------- Comment #3 from manu at gcc dot gnu dot org 2008-02-26 20:14 -------
(In reply to comment #2)
> You can use
>
> /* { dg-add-options register } */
>
> register int * volatile x asm REGISTER; /* { dg-warning "optimization may
> eliminate reads and/or writes to register variables" } */
>
> You need to define add_options_for_register to add proper
> -DREGITSR=.
>
That seems too complicated for a simple diagnostics test. Moreover, I couldn't
find a single example of that in the testsuite. Why not simply?
/* { dg-do compile } */
/* { dg-options "-Wall" } */
#ifdef __i386__
register unsigned int volatile reg __asm ("esi"); /* { dg-warning "optimization
may eliminate reads and/or writes to register variables" } */
#elif defined __x86_64__
register int * volatile x __asm ("r13"); /* { dg-warning "optimization may
eliminate reads and/or writes to register variables" } */
#else
unsigned int reg;
#endif
I can only test in x86_64-unknown-linux-gnu.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35382
