Re: [PATCH v2 6/7] tcg/ppc: Disable USE_REG_TB for Power v3.1

[Nicholas Piggin]

On Tue Aug 8, 2023 at 1:02 PM AEST, Richard Henderson wrote:
> With Power v3.1, we have pc-relative addressing and so
> do not require a register holding the current TB.
>

Acked-by: Nicholas Piggin <npiggin@gmail.com>

> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>  tcg/ppc/tcg-target.c.inc | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tcg/ppc/tcg-target.c.inc b/tcg/ppc/tcg-target.c.inc
> index 01ca5c9f39..63fe4ef995 100644
> --- a/tcg/ppc/tcg-target.c.inc
> +++ b/tcg/ppc/tcg-target.c.inc
> @@ -83,7 +83,7 @@
>  #define TCG_VEC_TMP2    TCG_REG_V1
>  
>  #define TCG_REG_TB     TCG_REG_R31
> -#define USE_REG_TB     (TCG_TARGET_REG_BITS == 64)
> +#define USE_REG_TB     (TCG_TARGET_REG_BITS == 64 && !have_isa_3_10)
>  
>  /* Shorthand for size of a pointer.  Avoid promotion to unsigned.  */
>  #define SZP  ((int)sizeof(void *))