From 3895eea3b465af4be794bc9bb8492bcf82957c52 Mon Sep 17 00:00:00 2001
From: "Emilio G. Cota" <cota@braap.org>
Date: Sat, 3 Mar 2018 14:07:48 -0500
Subject: [PATCH] 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.

Backports commit fe62089563ffc6a42f16ff28a6b6be34d2697766 from qemu
---
 qemu/target/i386/translate.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/qemu/target/i386/translate.c b/qemu/target/i386/translate.c
index 2c96d974..8fe6b2aa 100644
--- a/qemu/target/i386/translate.c
+++ b/qemu/target/i386/translate.c
@@ -2430,9 +2430,8 @@ static inline void gen_goto_tb(DisasContext *s, int tb_num, target_ulong eip)
         gen_jmp_im(s, eip);
         tcg_gen_exit_tb(tcg_ctx, (uintptr_t)s->tb + tb_num);
     } else {
-        /* jump to another page: currently not optimized */
-        gen_jmp_im(s, eip);
-        gen_eob(s);
+        /* jump to another page */
+        gen_jr(s, tcg_ctx->cpu_tmp0);
     }
 }