1 /*
   2  * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  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 inline bool LinearScan::is_processed_reg_num(int reg_num) {
  26   return reg_num < 26 || reg_num > 31;
  27 }
  28 
  29 inline int LinearScan::num_physical_regs(BasicType type) {
  30   // Sparc requires two cpu registers for long
  31   // and two cpu registers for double
  32 #ifdef _LP64
  33   if (type == T_DOUBLE) {
  34 #else
  35   if (type == T_DOUBLE || type == T_LONG) {
  36 #endif
  37     return 2;
  38   }
  39   return 1;
  40 }
  41 
  42 
  43 inline bool LinearScan::requires_adjacent_regs(BasicType type) {
  44 #ifdef _LP64
  45   return type == T_DOUBLE;
  46 #else
  47   return type == T_DOUBLE || type == T_LONG;
  48 #endif
  49 }
  50 
  51 inline bool LinearScan::is_caller_save(int assigned_reg) {
  52   return assigned_reg > pd_last_callee_saved_reg && assigned_reg <= pd_last_fpu_reg;
  53 }
  54 
  55 
  56 inline void LinearScan::pd_add_temps(LIR_Op* op) {
  57   // No special case behaviours yet
  58 }
  59 
  60 
  61 inline bool LinearScanWalker::pd_init_regs_for_alloc(Interval* cur) {
  62   if (allocator()->gen()->is_vreg_flag_set(cur->reg_num(), LIRGenerator::callee_saved)) {
  63     assert(cur->type() != T_FLOAT && cur->type() != T_DOUBLE, "cpu regs only");
  64     _first_reg = pd_first_callee_saved_reg;
  65     _last_reg = pd_last_callee_saved_reg;
  66     return true;
  67   } else if (cur->type() == T_INT || cur->type() == T_LONG || cur->type() == T_OBJECT || cur->type() == T_ADDRESS) {
  68     _first_reg = pd_first_cpu_reg;
  69     _last_reg = pd_last_allocatable_cpu_reg;
  70     return true;
  71   }
  72   return false;
  73 }