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target/i386: optimize cross-page direct jumps in softmmu 

Instead of unconditionally exiting to the exec loop, use the
gen_jr helper to jump to the target if it is valid.

Perf impact: see next commit's log.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1493263764-18657-10-git-send-email-cota@braap.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
master
Emilio G. Cota 2017-04-26 23:29:22 -04:00 committed by Richard Henderson
parent 1ebb1af1b8
commit fe62089563
1 changed files with 2 additions and 2 deletions
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4
target/i386/translate.c
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@ -2154,9 +2154,9 @@ static inline void gen_goto_tb(DisasContext *s, int tb_num, target_ulong eip)
gen_jmp_im(eip);
tcg_gen_exit_tb((uintptr_t)s->tb + tb_num);
} else {
/* jump to another page: currently not optimized */
/* jump to another page */
gen_jmp_im(eip);
gen_eob(s);
gen_jr(s, cpu_tmp0);
}
}