src/cpu/x86/vm/x86_64.ad

rev 2506 : [mq]: membar2

*** 7379,7400 ****
    format %{ "MEMBAR-acquire ! (empty encoding)" %}
    ins_encode();
    ins_pipe(empty);
  %}
  
- instruct membar_acquire_lock()
- %{
-   match(MemBarAcquire);
-   predicate(Matcher::prior_fast_lock(n));
-   ins_cost(0);
- 
-   size(0);
-   format %{ "MEMBAR-acquire (prior CMPXCHG in FastLock so empty encoding)" %}
-   ins_encode();
-   ins_pipe(empty);
- %}
- 
  instruct membar_release()
  %{
    match(MemBarRelease);
    ins_cost(0);
  
--- 7379,7388 ----
*** 7402,7423 ****
    format %{ "MEMBAR-release ! (empty encoding)" %}
    ins_encode();
    ins_pipe(empty);
  %}
  
- instruct membar_release_lock()
- %{
-   match(MemBarRelease);
-   predicate(Matcher::post_fast_unlock(n));
-   ins_cost(0);
- 
-   size(0);
-   format %{ "MEMBAR-release (a FastUnlock follows so empty encoding)" %}
-   ins_encode();
-   ins_pipe(empty);
- %}
- 
  instruct membar_volatile(rFlagsReg cr) %{
    match(MemBarVolatile);
    effect(KILL cr);
    ins_cost(400);
  
--- 7390,7399 ----