[PATCH v2] AArch64: Reset HWCAP2_AFP bits in FPCR for default fenv

[Szabolcs Nagy]

The 07/05/2022 11:35, Tejas Belagod wrote:
> The AFP feature (Alternate floating-point behavior) was added in armv8.7 and
> introduced new FPCR bits.
> 
> Currently, HWCAP2_AFP bits (bit 0, 1, 2) in FPCR are preserved when fenv is
> set to default environment.  This is a deviation from standard behaviour.
> Clear these bits when setting the fenv to default.
> 
> There is no libc API to modify the new FPCR bits.  Restoring those bits matters
> if the user changed them directly.

thanks.
this looks ok, committed it for you.

> ---
>  sysdeps/aarch64/fpu/fpu_control.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/sysdeps/aarch64/fpu/fpu_control.h b/sysdeps/aarch64/fpu/fpu_control.h
> index 764ed5cdbb..429f4910e7 100644
> --- a/sysdeps/aarch64/fpu/fpu_control.h
> +++ b/sysdeps/aarch64/fpu/fpu_control.h
> @@ -46,7 +46,7 @@
>     contents. These two masks indicate which bits in each of FPCR and
>     FPSR should not be changed.  */
>  
> -#define _FPU_RESERVED		0xfe0fe0ff
> +#define _FPU_RESERVED		0xfe0fe0f8
>  #define _FPU_FPSR_RESERVED	0x0fffffe0
>  
>  #define _FPU_DEFAULT		0x00000000
> -- 
> 2.17.1
>