src/cpu/x86/vm/c1_LIRAssembler_x86.cpp

rev 3688 : 7054512: Compress class pointers after perm gen removal
Summary: support of compress class pointers in the compilers.
Reviewed-by:

*** 338,348 ****
  // inline cache check; done before the frame is built.
  int LIR_Assembler::check_icache() {
    Register receiver = FrameMap::receiver_opr->as_register();
    Register ic_klass = IC_Klass;
    const int ic_cmp_size = LP64_ONLY(10) NOT_LP64(9);
!   const bool do_post_padding = VerifyOops || UseCompressedOops;
    if (!do_post_padding) {
      // insert some nops so that the verified entry point is aligned on CodeEntryAlignment
      while ((__ offset() + ic_cmp_size) % CodeEntryAlignment != 0) {
        __ nop();
      }
--- 338,348 ----
  // inline cache check; done before the frame is built.
  int LIR_Assembler::check_icache() {
    Register receiver = FrameMap::receiver_opr->as_register();
    Register ic_klass = IC_Klass;
    const int ic_cmp_size = LP64_ONLY(10) NOT_LP64(9);
!   const bool do_post_padding = VerifyOops || UseCompressedKlassPointers;
    if (!do_post_padding) {
      // insert some nops so that the verified entry point is aligned on CodeEntryAlignment
      while ((__ offset() + ic_cmp_size) % CodeEntryAlignment != 0) {
        __ nop();
      }
*** 1260,1270 ****
--- 1260,1274 ----
          __ movptr(dest->as_register(), from_addr);
        }
        break;
  
      case T_ADDRESS:
+       if (UseCompressedKlassPointers && addr->disp() == oopDesc::klass_offset_in_bytes()) {
+         __ movl(dest->as_register(), from_addr);
+       } else {
          __ movptr(dest->as_register(), from_addr);
+       }
        break;
      case T_INT:
        __ movl(dest->as_register(), from_addr);
        break;
  
*** 1362,1371 ****
--- 1366,1377 ----
      if (UseCompressedOops && !wide) {
        __ decode_heap_oop(dest->as_register());
      }
  #endif
      __ verify_oop(dest->as_register());
+   } else if (type == T_ADDRESS && UseCompressedKlassPointers && addr->disp() == oopDesc::klass_offset_in_bytes()) {
+     __ decode_klass_not_null(dest->as_register());
    }
  }
  
  
  void LIR_Assembler::prefetchr(LIR_Opr src) {
*** 1703,1713 ****
    if (obj == k_RInfo) {
      k_RInfo = dst;
    } else if (obj == klass_RInfo) {
      klass_RInfo = dst;
    }
!   if (k->is_loaded() && !UseCompressedOops) {
      select_different_registers(obj, dst, k_RInfo, klass_RInfo);
    } else {
      Rtmp1 = op->tmp3()->as_register();
      select_different_registers(obj, dst, k_RInfo, klass_RInfo, Rtmp1);
    }
--- 1709,1719 ----
    if (obj == k_RInfo) {
      k_RInfo = dst;
    } else if (obj == klass_RInfo) {
      klass_RInfo = dst;
    }
!   if (k->is_loaded() && !UseCompressedKlassPointers) {
      select_different_registers(obj, dst, k_RInfo, klass_RInfo);
    } else {
      Rtmp1 = op->tmp3()->as_register();
      select_different_registers(obj, dst, k_RInfo, klass_RInfo, Rtmp1);
    }
*** 3444,3454 ****
      // but not necessarily exactly of type default_type.
      Label known_ok, halt;
      __ mov_metadata(tmp, default_type->constant_encoding());
  #ifdef _LP64
      if (UseCompressedKlassPointers) {
!       __ encode_heap_oop(tmp);
      }
  #endif
  
      if (basic_type != T_OBJECT) {
  
--- 3450,3460 ----
      // but not necessarily exactly of type default_type.
      Label known_ok, halt;
      __ mov_metadata(tmp, default_type->constant_encoding());
  #ifdef _LP64
      if (UseCompressedKlassPointers) {
!       __ encode_klass_not_null(tmp);
      }
  #endif
  
      if (basic_type != T_OBJECT) {