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src/hotspot/share/gc/g1/g1InCSetState.hpp

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  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_GC_G1_G1INCSETSTATE_HPP
  26 #define SHARE_VM_GC_G1_G1INCSETSTATE_HPP
  27 
  28 #include "gc/g1/g1BiasedArray.hpp"
  29 #include "gc/g1/heapRegion.hpp"
  30 #include "memory/allocation.hpp"
  31 
  32 // Per-region state during garbage collection.
  33 struct InCSetState {
  34  public:
  35   // We use different types to represent the state value. Particularly SPARC puts
  36   // values in structs from "left to right", i.e. MSB to LSB. This results in many
  37   // unnecessary shift operations when loading and storing values of this type.
  38   // This degrades performance significantly (>10%) on that platform.
  39   // Other tested ABIs do not seem to have this problem, and actually tend to
  40   // favor smaller types, so we use the smallest usable type there.
  41 #ifdef SPARC
  42   #define CSETSTATE_FORMAT INTPTR_FORMAT
  43   typedef intptr_t in_cset_state_t;
  44 #else
  45   #define CSETSTATE_FORMAT "%d"
  46   typedef int8_t in_cset_state_t;
  47 #endif
  48  private:
  49   in_cset_state_t _value;
  50  public:




  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_GC_G1_G1INCSETSTATE_HPP
  26 #define SHARE_VM_GC_G1_G1INCSETSTATE_HPP
  27 
  28 #include "gc/g1/g1BiasedArray.hpp"
  29 #include "gc/g1/heapRegion.hpp"

  30 
  31 // Per-region state during garbage collection.
  32 struct InCSetState {
  33  public:
  34   // We use different types to represent the state value. Particularly SPARC puts
  35   // values in structs from "left to right", i.e. MSB to LSB. This results in many
  36   // unnecessary shift operations when loading and storing values of this type.
  37   // This degrades performance significantly (>10%) on that platform.
  38   // Other tested ABIs do not seem to have this problem, and actually tend to
  39   // favor smaller types, so we use the smallest usable type there.
  40 #ifdef SPARC
  41   #define CSETSTATE_FORMAT INTPTR_FORMAT
  42   typedef intptr_t in_cset_state_t;
  43 #else
  44   #define CSETSTATE_FORMAT "%d"
  45   typedef int8_t in_cset_state_t;
  46 #endif
  47  private:
  48   in_cset_state_t _value;
  49  public:


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