From f96a38347a0c6ab31fbb6200c13e684d1fee449c Mon Sep 17 00:00:00 2001 From: Aurelien Jarno Date: Tue, 28 Dec 2010 17:46:59 +0100 Subject: 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 image. Signed-off-by: Aurelien Jarno --- exec-all.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/exec-all.h b/exec-all.h index 6821b17943..a4b75bdbcb 100644 --- a/exec-all.h +++ b/exec-all.h @@ -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); -- cgit v1.2.1