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| From: | Paolo Bonzini |
| Subject: | Re: [Qemu-devel] [PATCH 10/10] tb-hash: improve tb_jmp_cache hash function in user mode |
| Date: | Wed, 12 Apr 2017 11:46:47 +0800 |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 |
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
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