From 7ad55b4ffd982c80f26f7f3658138d94cdc678e8 Mon Sep 17 00:00:00 2001
From: "Emilio G. Cota" <cota@braap.org>
Date: Wed, 26 Apr 2017 23:29:19 -0400
Subject: [PATCH] target/arm: optimize cross-page direct jumps in softmmu
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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>
---
target/arm/translate.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/target/arm/translate.c b/target/arm/translate.c
index ae6646c05b..d72953f124 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -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);
}
}
--
2.30.2