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Re: [PATCH] powerpc: Avoid putting floating point values in memory



On 22/09/2017 15:19, Tulio Magno Quites Machado Filho wrote:
> 2017-09-22  Tulio Magno Quites Machado Filho  <tuliom@linux.vnet.ibm.com>
> 
> 	* sysdeps/powerpc/fpu/math_private.h (math_opt_barrier):
> 	(math_force_eval): Add powerpc version.
> ---
>  sysdeps/powerpc/fpu/math_private.h | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/sysdeps/powerpc/fpu/math_private.h b/sysdeps/powerpc/fpu/math_private.h
> index 396fd05..472182d 100644
> --- a/sysdeps/powerpc/fpu/math_private.h
> +++ b/sysdeps/powerpc/fpu/math_private.h
> @@ -23,6 +23,13 @@
>  #include <ldsodefs.h>
>  #include <dl-procinfo.h>
>  #include <fenv_private.h>
> +
> +/* Avoid putting floating point values in memory.  */
> +# define math_opt_barrier(x)					\
> +  ({ __typeof (x) __x = (x); __asm ("" : "+dwa" (__x)); __x; })
> +# define math_force_eval(x)						\
> +  ({ __typeof (x) __x = (x); __asm __volatile__ ("" : : "dwa" (__x)); })
> +
>  #include_next <math_private.h>
>  
>  #if defined _ARCH_PWR9 && __HAVE_DISTINCT_FLOAT128
> 

LGTM, it seems to work on older GCC as well (4.8).


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