Re: [Qemu-arm] [PATCH 10/10] tb-hash: improve tb_jmp_cache hash function in user mode

[Paolo Bonzini]

On 12/04/2017 09:17, Emilio G. Cota wrote:
> +
> +/* In user-mode we can get better hashing because we do not have a TLB */
> +static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)
> +{
> +    return (pc ^ (pc >> TB_JMP_CACHE_BITS)) & (TB_JMP_CACHE_SIZE - 1);
> +}

What about multiplicative hashing?

        return (uint64_t) (pc * 2654435761) >> 32;

Paolo