Re: [PATCH v2 04/50] tcg: Increase maximum TB size

On 7/29/26 20:09, Anton Johansson via qemu development wrote:
> Doubles amount of space allocated for translation blocks.  This is
> needed, particularly for Hexagon, where a single instruction packet may
> consist of up to four vector instructions.  If each vector instruction
> then gets expanded into gvec operations that utilize a small host vector
> size the TB blows up quite quickly.
> 
> Signed-off-by: Anton Johansson <[email protected]>
> ---
>   include/tcg/tcg.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/tcg/tcg.h b/include/tcg/tcg.h
> index 7669dc1c2d..9f0a35f1be 100644
> --- a/include/tcg/tcg.h
> +++ b/include/tcg/tcg.h
> @@ -40,7 +40,7 @@
>   /* XXX: make safe guess about sizes */
>   #define MAX_OP_PER_INSTR 266
>   
> -#define CPU_TEMP_BUF_NLONGS 128
> +#define CPU_TEMP_BUF_NLONGS 256
>   #define TCG_STATIC_FRAME_SIZE  (CPU_TEMP_BUF_NLONGS * sizeof(long))
>   
>   typedef int64_t tcg_target_long;

This isn't the size of the translation block, but the size of the stack frame.  Ok, with a 
re-wording of the commit message.


r~