[RFC][AARCH64] TARGET_ATOMIC_ASSIGN_EXPAND_FENV hook

[James Greenhalgh]

On Thu, May 22, 2014 at 03:24:23PM +0100, Marcus Shawcroft wrote:
> On 2 May 2014 13:27, Kugan <kugan.vivekanandarajah@linaro.org> wrote:
> 
> > +2014-05-02  Kugan Vivekanandarajah  <kuganv@linaro.org>
> > +
> > +       * config/aarch64/aarch64.c (TARGET_ATOMIC_ASSIGN_EXPAND_FENV): New
> > +       define.
> > +       * config/aarch64/aarch64-protos.h (aarch64_atomic_assign_expand_fenv):
> > +       New function declaration.
> > +       * config/aarch64/aarch64-builtins.c (aarch64_builtins) : Add
> > +       AARCH64_BUILTIN_GET_FPCR, AARCH64_BUILTIN_SET_FPCR.
> > +       AARCH64_BUILTIN_GET_FPSR and AARCH64_BUILTIN_SET_FPSR.
> > +       (aarch64_init_builtins) : Initialize builtins
> > +       __builtins_aarch64_set_fpcr, __builtins_aarch64_get_fpcr.
> > +       __builtins_aarch64_set_fpsr and __builtins_aarch64_get_fpsr.
> > +       (aarch64_expand_builtin) : Expand builtins __builtins_aarch64_set_fpcr
> > +       __builtins_aarch64_get_fpcr, __builtins_aarch64_get_fpsr,
> > +       and __builtins_aarch64_set_fpsr.
> > +       (aarch64_atomic_assign_expand_fenv): New function.
> > +       * config/aarch64/aarch64.md (set_fpcr): New pattern.
> > +       (get_fpcr) : Likewise.
> > +       (set_fpsr) : Likewise.
> > +       (get_fpsr) : Likewise.
> > +       (unspecv): Add UNSPECV_GET_FPCR and UNSPECV_SET_FPCR, UNSPECV_GET_FPSR
> > +        and UNSPECV_SET_FPSR.
> > +       * doc/extend.texi (AARCH64 Built-in Functions) : Document
> > +       __builtins_aarch64_set_fpcr, __builtins_aarch64_get_fpcr.
> > +       __builtins_aarch64_set_fpsr and __builtins_aarch64_get_fpsr.
> > +
> 
> OK, thanks Kugan.
> 

I appreciate it is quite late in the day for the 4.9.3 branch, but do
we want to consider this patch for backporting (either now or after
the branch reopens)?

  gcc.dg/atomic/c11-atomic-exec-5.c

is the only interesting test I see failing on a native AArch64 build of
the 4.9.3 release candidate (there is plenty of other FAILures, but they
are guality, scan assembler or missed optimization fails).

Thanks,
James