C++ LIR_Opr::is_float_kind方法代码示例

void FpuStackAllocator::handle_op2(LIR_Op2* op2) {
  LIR_Opr left  = op2->in_opr1();
  if (!left->is_float_kind()) {
    return;
  }
  if (left->is_xmm_register()) {
    return;
  }

  LIR_Opr right = op2->in_opr2();
  LIR_Opr res   = op2->result_opr();
  LIR_Opr new_left  = left;  // new operands relative to the actual fpu stack top
  LIR_Opr new_right = right;
  LIR_Opr new_res   = res;

  assert(!left->is_xmm_register() && !right->is_xmm_register() && !res->is_xmm_register(), "not for xmm registers");

  switch (op2->code()) {
    case lir_cmp:
    case lir_cmp_fd2i:
    case lir_ucmp_fd2i:
    case lir_assert: {
      assert(left->is_fpu_register(), "invalid LIR");
      assert(right->is_fpu_register(), "invalid LIR");

      // the left-hand side must be on top of stack.
      // the right-hand side is never popped, even if is_last_use is set
      insert_exchange(left);
      new_left = to_fpu_stack_top(left);
      new_right = to_fpu_stack(right);
      pop_if_last_use(op2, left);
      break;
    }

    case lir_mul_strictfp:
    case lir_div_strictfp: {
      assert(op2->tmp1_opr()->is_fpu_register(), "strict operations need temporary fpu stack slot");
      insert_free_if_dead(op2->tmp1_opr());
      assert(sim()->stack_size() <= 7, "at least one stack slot must be free");
      // fall-through: continue with the normal handling of lir_mul and lir_div
    }
    case lir_add:
    case lir_sub:
    case lir_mul:
    case lir_div: {
      assert(left->is_fpu_register(), "must be");
      assert(res->is_fpu_register(), "must be");
      assert(left->is_equal(res), "must be");

      // either the left-hand or the right-hand side must be on top of stack
      // (if right is not a register, left must be on top)
      if (!right->is_fpu_register()) {
        insert_exchange(left);
        new_left = to_fpu_stack_top(left);
      } else {
        // no exchange necessary if right is alredy on top of stack
        if (tos_offset(right) == 0) {
          new_left = to_fpu_stack(left);
          new_right = to_fpu_stack_top(right);
        } else {
          insert_exchange(left);
          new_left = to_fpu_stack_top(left);
          new_right = to_fpu_stack(right);
        }

        if (right->is_last_use()) {
          op2->set_fpu_pop_count(1);

          if (tos_offset(right) == 0) {
            sim()->pop();
          } else {
            // if left is on top of stack, the result is placed in the stack
            // slot of right, so a renaming from right to res is necessary
            assert(tos_offset(left) == 0, "must be");
            sim()->pop();
            do_rename(right, res);
          }
        }
      }
      new_res = to_fpu_stack(res);

      break;
    }

    case lir_rem: {
      assert(left->is_fpu_register(), "must be");
      assert(right->is_fpu_register(), "must be");
      assert(res->is_fpu_register(), "must be");
      assert(left->is_equal(res), "must be");

      // Must bring both operands to top of stack with following operand ordering:
      // * fpu stack before rem: ... right left
      // * fpu stack after rem:  ... left
      if (tos_offset(right) != 1) {
        insert_exchange(right);
        insert_exchange(1);
      }
      insert_exchange(left);
      assert(tos_offset(right) == 1, "check");
      assert(tos_offset(left) == 0, "check");
//.........这里部分代码省略.........

//.........这里部分代码省略.........

        do_rename(in, res);
        new_res = to_fpu_stack_top(res);
      }
      break;
    }

    case lir_convert: {
      Bytecodes::Code bc = op1->as_OpConvert()->bytecode();
      switch (bc) {
        case Bytecodes::_d2f:
        case Bytecodes::_f2d:
          assert(res->is_fpu_register(), "must be");
          assert(in->is_fpu_register(), "must be");

          if (!in->is_xmm_register() && !res->is_xmm_register()) {
            // this is quite the same as a move from fpu-register to fpu-register
            // Note: input and result operands must have different types
            if (fpu_num(in) == fpu_num(res)) {
              // nothing to do
              new_in = to_fpu_stack(in);
            } else if (in->is_last_use()) {
              insert_free_if_dead(res);//, in);
              new_in = to_fpu_stack(in);
              do_rename(in, res);
            } else {
              insert_free_if_dead(res);
              insert_copy(in, res);
              new_in = to_fpu_stack_top(in, true);
            }
            new_res = to_fpu_stack(res);
          }

          break;

        case Bytecodes::_i2f:
        case Bytecodes::_l2f:
        case Bytecodes::_i2d:
        case Bytecodes::_l2d:
          assert(res->is_fpu_register(), "must be");
          if (!res->is_xmm_register()) {
            insert_free_if_dead(res);
            do_push(res);
            new_res = to_fpu_stack_top(res);
          }
          break;

        case Bytecodes::_f2i:
        case Bytecodes::_d2i:
          assert(in->is_fpu_register(), "must be");
          if (!in->is_xmm_register()) {
            insert_exchange(in);
            new_in = to_fpu_stack_top(in);

            // TODO: update registes of stub
          }
          break;

        case Bytecodes::_f2l:
        case Bytecodes::_d2l:
          assert(in->is_fpu_register(), "must be");
          if (!in->is_xmm_register()) {
            insert_exchange(in);
            new_in = to_fpu_stack_top(in);
            pop_always(op1, in);
          }
          break;

        case Bytecodes::_i2l:
        case Bytecodes::_l2i:
        case Bytecodes::_i2b:
        case Bytecodes::_i2c:
        case Bytecodes::_i2s:
          // no fpu operands
          break;

        default:
          ShouldNotReachHere();
      }
      break;
    }

    case lir_roundfp: {
      assert(in->is_fpu_register() && !in->is_xmm_register(), "input must be in register");
      assert(res->is_stack(), "result must be on stack");

      insert_exchange(in);
      new_in = to_fpu_stack_top(in);
      pop_if_last_use(op1, in);
      break;
    }

    default: {
      assert(!in->is_float_kind() && !res->is_float_kind(), "missed a fpu-operation");
    }
  }

  op1->set_in_opr(new_in);
  op1->set_result_opr(new_res);
}