Commit f96a3834 authored by Aurelien Jarno's avatar Aurelien Jarno

TCG: Improve tb_phys_hash_func()

Most of emulated CPU have instructions aligned on 16 or 32 bits, while
on others GCC tries to align the target jump location. This means that
1/2 or 3/4 of tb_phys_hash entries are never used.

Update the hash function tb_phys_hash_func() to ignore the two lowest
bits of the address. This brings a 6% speed-up when booting a MIPS
Signed-off-by: default avatarAurelien Jarno <>
parent 8aac08b1
......@@ -177,7 +177,7 @@ static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)
static inline unsigned int tb_phys_hash_func(tb_page_addr_t pc)
return pc & (CODE_GEN_PHYS_HASH_SIZE - 1);
return (pc >> 2) & (CODE_GEN_PHYS_HASH_SIZE - 1);
TranslationBlock *tb_alloc(target_ulong pc);
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