src/cpu/x86/vm/x86_32.ad

rev 2570 : imported patch membar2
rev 2571 : [mq]: membar3

*** 7804,7815 ****
    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( );
--- 7804,7814 ----
    ins_encode();
    ins_pipe(empty);
  %}
  
  instruct membar_acquire_lock() %{
!   match(MemBarAcquireLock);
    ins_cost(0);
  
    size(0);
    format %{ "MEMBAR-acquire (prior CMPXCHG in FastLock so empty encoding)" %}
    ins_encode( );
*** 7825,7836 ****
    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( );
--- 7824,7834 ----
    ins_encode( );
    ins_pipe(empty);
  %}
  
  instruct membar_release_lock() %{
!   match(MemBarReleaseLock);
    ins_cost(0);
  
    size(0);
    format %{ "MEMBAR-release (a FastUnlock follows so empty encoding)" %}
    ins_encode( );