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

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

Perf impact: see next commit's log.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1493263764-18657-7-git-send-email-cota@braap.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Emilio G. Cota 2017-04-26 23:29:19 -04:00 committed by Richard Henderson
parent 5cb4ef80f6
commit 7ad55b4ffd
1 changed files with 5 additions and 1 deletions
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6
target/arm/translate.c
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@ -4157,8 +4157,12 @@ static inline void gen_goto_tb(DisasContext *s, int n, target_ulong dest)
gen_set_pc_im(s, dest);
tcg_gen_exit_tb((uintptr_t)s->tb + n);
} else {
TCGv addr = tcg_temp_new();
gen_set_pc_im(s, dest);
tcg_gen_exit_tb(0);
tcg_gen_extu_i32_tl(addr, cpu_R[15]);
tcg_gen_lookup_and_goto_ptr(addr);
tcg_temp_free(addr);
}
}