src/hotspot/share/gc/g1/c2/g1BarrierSetC2.cpp

rev 55659 : 8225776: Branch profiling for G1's write post-barrier in C2.

*** 63,72 ****
--- 63,85 ----
    const TypeTuple *range = TypeTuple::make(TypeFunc::Parms, fields);
  
    return TypeFunc::make(domain, range);
  }
  
+ const TypeFunc *G1BarrierSetC2::write_ref_stats_Type() {
+   const Type **fields = TypeTuple::fields(2);
+   fields[TypeFunc::Parms+0] = TypeRawPtr::NOTNULL;  // HeapWord* dst
+   fields[TypeFunc::Parms+1] = TypeInstPtr::NOTNULL;  // oopDesc* val
+   const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+2, fields);
+ 
+   // create result type (range)
+   fields = TypeTuple::fields(0);
+   const TypeTuple *range = TypeTuple::make(TypeFunc::Parms, fields);
+ 
+   return TypeFunc::make(domain, range);
+ }
+ 
  #define __ ideal.
  /*
   * Determine if the G1 pre-barrier can be removed. The pre-barrier is
   * required by SATB to make sure all objects live at the start of the
   * marking are kept alive, all reference updates need to any previous
*** 450,459 ****
--- 463,476 ----
    Node* card_adr = __ AddP(no_base, byte_map_base_node(kit), card_offset );
  
    // If we know the value being stored does it cross regions?
  
    if (val != NULL) {
+     if (UsePerfData && G1WriteBarrierStats) {
+       const TypeFunc *stats_tf = write_ref_stats_Type();
+       __ make_leaf_call(stats_tf, CAST_FROM_FN_PTR(address, G1BarrierSetRuntime::write_ref_stats), "write_ref_stats", adr, val);
+     }
      // Does the store cause us to cross regions?
  
      // Should be able to do an unsigned compare of region_size instead of
      // and extra shift. Do we have an unsigned compare??
      // Node* region_size = __ ConI(1 << HeapRegion::LogOfHRGrainBytes);
*** 656,666 ****
    CallLeafNode *call = node->as_CallLeaf();
    if (call->_name == NULL) {
      return false;
    }
  
!   return strcmp(call->_name, "write_ref_field_pre_entry") == 0 || strcmp(call->_name, "write_ref_field_post_entry") == 0;
  }
  
  void G1BarrierSetC2::eliminate_gc_barrier(PhaseMacroExpand* macro, Node* node) const {
    assert(node->Opcode() == Op_CastP2X, "ConvP2XNode required");
    assert(node->outcnt() <= 2, "expects 1 or 2 users: Xor and URShift nodes");
--- 673,683 ----
    CallLeafNode *call = node->as_CallLeaf();
    if (call->_name == NULL) {
      return false;
    }
  
!   return strcmp(call->_name, "write_ref_field_pre_entry") == 0 || strcmp(call->_name, "write_ref_field_post_entry") == 0 || strcmp(call->_name, "write_ref_stats") == 0;
  }
  
  void G1BarrierSetC2::eliminate_gc_barrier(PhaseMacroExpand* macro, Node* node) const {
    assert(node->Opcode() == Op_CastP2X, "ConvP2XNode required");
    assert(node->outcnt() <= 2, "expects 1 or 2 users: Xor and URShift nodes");