[PATCH] sparc: Treat the version field in the FPU control word as reserved

[Adhemerval Zanella Netto]

On 12/01/24 06:26, Daniel Cederman wrote:
> The FSR version field is read-only and might be non-zero.
> 
> This allows math/test-fpucw* to correctly pass when the version is
> non-zero.
> 
> Signed-off-by: Daniel Cederman <cederman@gaisler.com>

It looks reasonable to mask off the version _FPU_RESERVED.  It also
means that it would be change by __setfpucw, although afaik the ISA
guarantee that it can not be changed anyway.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

> ---
>  sysdeps/sparc/fpu/fpu_control.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/sysdeps/sparc/fpu/fpu_control.h b/sysdeps/sparc/fpu/fpu_control.h
> index 9313743f86..36a2bf5d07 100644
> --- a/sysdeps/sparc/fpu/fpu_control.h
> +++ b/sysdeps/sparc/fpu/fpu_control.h
> @@ -42,7 +42,7 @@
>  #define _FPU_RC_ZERO    0x40000000
>  #define _FPU_RC_NEAREST 0x0        /* RECOMMENDED */
>  
> -#define _FPU_RESERVED   0x30300000  /* Reserved bits in cw */
> +#define _FPU_RESERVED   0x303e0000  /* Reserved bits in cw */
>  
>  
>  /* Now two recommended cw */