Re: [PATCH] target/s390x: Check reserved bits of VFMIN/VFMAX's M5

[David Hildenbrand]

On 05.08.23 01:46, Ilya Leoshkevich wrote:
> VFMIN and VFMAX should raise a specification exceptions when bits 1-3
> of M5 are set.
>
> Cc: qemu-stable@nongnu.org
> Fixes: da4807527f3b ("s390x/tcg: Implement VECTOR FP (MAXIMUM|MINIMUM)")
> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
> ---
>   target/s390x/tcg/translate_vx.c.inc | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/target/s390x/tcg/translate_vx.c.inc 
> b/target/s390x/tcg/translate_vx.c.inc
> index f8df121d3d3..b5d07d5ec53 100644
> --- a/target/s390x/tcg/translate_vx.c.inc
> +++ b/target/s390x/tcg/translate_vx.c.inc
> @@ -3047,7 +3047,7 @@ static DisasJumpType op_vfmax(DisasContext *s, DisasOps 
> *o)
>       const uint8_t m5 = get_field(s, m5);
>       gen_helper_gvec_3_ptr *fn;
>   
> -    if (m6 == 5 || m6 == 6 || m6 == 7 || m6 >= 13) {
> +    if (m6 == 5 || m6 == 6 || m6 == 7 || m6 >= 13 || (m5 & 7)) {
>           gen_program_exception(s, PGM_SPECIFICATION);
>           return DISAS_NORETURN;
>       }

Reviewed-by: David Hildenbrand <david@redhat.com>

--
Cheers,

David / dhildenb