Re: [PATCH 15/20] target/arm: Convert TBZ, TBNZ to decodetree

[Richard Henderson]

On 5/12/23 15:41, Peter Maydell wrote:
> Convert the test-and-branch-immediate insns TBZ and TBNZ
> to decodetree.
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
>   target/arm/tcg/a64.decode      |  7 +++++++
>   target/arm/tcg/translate-a64.c | 25 +++++--------------------
>   2 files changed, 12 insertions(+), 20 deletions(-)
>
> diff --git a/target/arm/tcg/a64.decode b/target/arm/tcg/a64.decode
> index 86220569e13..68dc820ece0 100644
> --- a/target/arm/tcg/a64.decode
> +++ b/target/arm/tcg/a64.decode
> @@ -121,3 +121,10 @@ BL              1 00101 .......................... @branch
>   @cbz            sf:1 ...... nz:1 ................... rt:5 &cbz imm=%imm19
>   
>   CBZ             . 011010 . ................... ..... @cbz
> +
> +%imm14     5:s14 !function=times_4
> +%imm31_19  31:1 19:5
> +&tbz       rt imm nz bitpos
> +@tbz            . ...... nz:1 ..... .............. rt:5 &tbz  imm=%imm14 
> bitpos=%imm31_19
> +
> +TBZ             . 011011 . ..... .............. ..... @tbz

Similarly with the single-use @format.

> -    tcg_gen_andi_i64(tcg_cmp, cpu_reg(s, rt), (1ULL << bit_pos));
> +    tcg_gen_andi_i64(tcg_cmp, cpu_reg(s, a->rt), (1ULL << a->bitpos));

Can we drop the () around the bit, or use BIT()?.

Otherwise,
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~