src/share/vm/opto/postaloc.cpp

*** 660,670 ****
                def = def->in(idx);
              Node *valdef = skip_copies(def); // tighten up val through non-useless copies
              value.map(ureg,valdef); // record improved reaching-def info
              regnd.map(ureg,   def);
              // Record other half of doubles
!             uint def_ideal_reg = def->ideal_reg();
              int n_regs = RegMask::num_registers(def_ideal_reg);
              for (int l = 1; l < n_regs; l++) {
                OptoReg::Name ureg_lo = OptoReg::add(ureg,-l);
                if (!value[ureg_lo] &&
                    (!RegMask::can_represent(ureg_lo) ||
--- 660,670 ----
                def = def->in(idx);
              Node *valdef = skip_copies(def); // tighten up val through non-useless copies
              value.map(ureg,valdef); // record improved reaching-def info
              regnd.map(ureg,   def);
              // Record other half of doubles
!             Opcodes def_ideal_reg = def->ideal_reg();
              int n_regs = RegMask::num_registers(def_ideal_reg);
              for (int l = 1; l < n_regs; l++) {
                OptoReg::Name ureg_lo = OptoReg::add(ureg,-l);
                if (!value[ureg_lo] &&
                    (!RegMask::can_represent(ureg_lo) ||
*** 704,714 ****
        if (regnd[nreg] != NULL && regnd[nreg]->outcnt() == 0) {
          regnd.map(nreg, NULL);
          value.map(nreg, NULL);
        }
  
!       uint n_ideal_reg = n->ideal_reg();
        int n_regs = RegMask::num_registers(n_ideal_reg);
        if (n_regs == 1) {
          // If Node 'n' does not change the value mapped by the register,
          // then 'n' is a useless copy.  Do not update the register->node
          // mapping so 'n' will go dead.
--- 704,714 ----
        if (regnd[nreg] != NULL && regnd[nreg]->outcnt() == 0) {
          regnd.map(nreg, NULL);
          value.map(nreg, NULL);
        }
  
!       Opcodes n_ideal_reg = n->ideal_reg();
        int n_regs = RegMask::num_registers(n_ideal_reg);
        if (n_regs == 1) {
          // If Node 'n' does not change the value mapped by the register,
          // then 'n' is a useless copy.  Do not update the register->node
          // mapping so 'n' will go dead.
*** 771,781 ****
            j -= replace_and_yank_if_dead(n, nreg, block, value, regnd);
          }
        }
  
        // Fat projections kill many registers
!       if( n_ideal_reg == MachProjNode::fat_proj ) {
          RegMask rm = n->out_RegMask();
          // wow, what an expensive iterator...
          nreg = rm.find_first_elem();
          while( OptoReg::is_valid(nreg)) {
            rm.Remove(nreg);
--- 771,781 ----
            j -= replace_and_yank_if_dead(n, nreg, block, value, regnd);
          }
        }
  
        // Fat projections kill many registers
!       if( n_ideal_reg == static_cast<Opcodes>(MachProjNode::projType::fat_proj) ) {
          RegMask rm = n->out_RegMask();
          // wow, what an expensive iterator...
          nreg = rm.find_first_elem();
          while( OptoReg::is_valid(nreg)) {
            rm.Remove(nreg);