[RFC,2/3] tcg: Reuse hashed pc value

Commit Message

Pranith Kumar Dec. 6, 2016, 8:56 p.m. UTC

Reuse the hashed pc value instead of calculating it again.

Signed-off-by: Pranith Kumar <[e-mail]>
---
 cpu-exec.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Patch

diff --git a/cpu-exec.c b/cpu-exec.c
index f4a00f5047..13cb15de0e 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -323,7 +323,8 @@  static inline TranslationBlock *tb_find(CPUState *cpu,
        always be the same before a given translated block
        is executed. */
     cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
-    tb = atomic_rcu_read(&cpu->tb_jmp_cache[tb_jmp_cache_hash_func(pc)]);
+    unsigned int pc_hash = tb_jmp_cache_hash_func(pc);
+    tb = atomic_rcu_read(&cpu->tb_jmp_cache[pc_hash]);
     if (unlikely(!tb || tb->pc != pc || tb->cs_base != cs_base ||
                  tb->flags != flags)) {
         tb = tb_htable_lookup(cpu, pc, cs_base, flags);
@@ -350,7 +351,7 @@  static inline TranslationBlock *tb_find(CPUState *cpu,
         }
 
         /* We add the TB in the virtual pc hash table for the fast lookup */
-        atomic_set(&cpu->tb_jmp_cache[tb_jmp_cache_hash_func(pc)], tb);
+        atomic_set(&cpu->tb_jmp_cache[pc_hash], tb);
     }
 #ifndef CONFIG_USER_ONLY
     /* We don't take care of direct jumps when address mapping changes in