From: Emilio G. Cota <cota@braap.org>
Date: Thu, 27 Apr 2017 03:29:22 +0000 (-0400)
Subject: target/i386: optimize cross-page direct jumps in softmmu
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=fe62089563ffc6a42f16ff28a6b6be34d2697766;p=qemu.git

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>
---

diff --git a/target/i386/translate.c b/target/i386/translate.c
index f0e48dc361..ea113fe5aa 100644
--- a/target/i386/translate.c
+++ b/target/i386/translate.c
@@ -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);
     }
 }