Re: [PATCH 1/3] target/arm: Remove redundant mmu_idx lookup

[Vincenzo Frascino]

On 10/8/20 5:21 PM, Richard Henderson wrote:
> We already have the full ARMMMUIdx as computed from the
> function parameter.
> 
> For the purpose of regime_has_2_ranges, we can ignore any
> difference between AccType_Normal and AccType_Unpriv, which
> would be the only difference between the passed mmu_idx
> and arm_mmu_idx_el.
> 
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com>

> ---
>  target/arm/mte_helper.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/target/arm/mte_helper.c b/target/arm/mte_helper.c
> index 5615c6706c..734cc5ca67 100644
> --- a/target/arm/mte_helper.c
> +++ b/target/arm/mte_helper.c
> @@ -563,8 +563,7 @@ static void mte_check_fail(CPUARMState *env, uint32_t 
> desc,
>  
>      case 2:
>          /* Tag check fail causes asynchronous flag set.  */
> -        mmu_idx = arm_mmu_idx_el(env, el);
> -        if (regime_has_2_ranges(mmu_idx)) {
> +        if (regime_has_2_ranges(arm_mmu_idx)) {
>              select = extract64(dirty_ptr, 55, 1);
>          } else {
>              select = 0;
> 

-- 
Regards,
Vincenzo