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[Qemu-devel] [PATCH v7 09/26] target/i386: optimize cross-page direct ju


From: Richard Henderson
Subject: [Qemu-devel] [PATCH v7 09/26] target/i386: optimize cross-page direct jumps in softmmu
Date: Fri, 26 May 2017 14:16:21 -0700

From: "Emilio G. Cota" <address@hidden>

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 <address@hidden>
Signed-off-by: Emilio G. Cota <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Richard Henderson <address@hidden>
---
 target/i386/translate.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/i386/translate.c b/target/i386/translate.c
index f0e48dc..ea113fe 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);
     }
 }
 
-- 
2.9.4




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