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Speedup 'tb_find_slow' by using the same heuristic as during memory page lookup

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Move the last found TB to the head of the list so it will be found more quickly next time it will be looked for.

Signed-off-by: Kirill Batuzov <batuzovk@ispras.ru>
Signed-off-by: Pavel Yushchenko <pau@ispras.ru>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Kirill Batuzov 2010-12-02 16:12:46 +03:00 committed by Blue Swirl
parent 53016fa69c
commit 2c90fe2b71
1 changed files with 6 additions and 0 deletions
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6
cpu-exec.c
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@ -167,6 +167,12 @@ static TranslationBlock *tb_find_slow(target_ulong pc,
tb = tb_gen_code(env, pc, cs_base, flags, 0);
found:
/* Move the last found TB to the head of the list */
if (likely(*ptb1)) {
*ptb1 = tb->phys_hash_next;
tb->phys_hash_next = tb_phys_hash[h];
tb_phys_hash[h] = tb;
}
/* we add the TB in the virtual pc hash table */
env->tb_jmp_cache[tb_jmp_cache_hash_func(pc)] = tb;
return tb;