1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2016 SAP SE. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #ifndef CPU_S390_VM_C1_LINEARSCAN_S390_HPP
  27 #define CPU_S390_VM_C1_LINEARSCAN_S390_HPP
  28 
  29 inline bool LinearScan::is_processed_reg_num(int reg_num) {
  30   // unallocated: Z_thread, Z_fp, Z_SP, Z_R0_scratch, Z_R1_scratch, Z_R14
  31   assert(FrameMap::Z_R14_opr->cpu_regnr() == 10, "wrong assumption below");
  32   assert(FrameMap::Z_R0_opr->cpu_regnr()  == 11, "wrong assumption below");
  33   assert(FrameMap::Z_R1_opr->cpu_regnr()  == 12, "wrong assumption below");
  34   assert(FrameMap::Z_R8_opr->cpu_regnr()  == 13, "wrong assumption below");
  35   assert(FrameMap::Z_R9_opr->cpu_regnr()  == 14, "wrong assumption below");
  36   assert(FrameMap::Z_R15_opr->cpu_regnr() == 15, "wrong assumption below");
  37   assert(reg_num >= 0, "invalid reg_num");
  38   return reg_num <= FrameMap::last_cpu_reg() || reg_num >= pd_nof_cpu_regs_frame_map;
  39 }
  40 
  41 inline int LinearScan::num_physical_regs(BasicType type) {
  42   // IBM Z requires one cpu registers for long,
  43   // and one fpu register for double.
  44   return 1;
  45 }
  46 
  47 inline bool LinearScan::requires_adjacent_regs(BasicType type) {
  48   return false;
  49 }
  50 
  51 inline bool LinearScan::is_caller_save(int assigned_reg) {
  52   assert(assigned_reg >= 0 && assigned_reg < nof_regs, "should call this only for registers");
  53   return true; // No callee-saved registers on IBM Z.
  54 }
  55 
  56 inline void LinearScan::pd_add_temps(LIR_Op* op) {
  57   // No special case behaviours.
  58 }
  59 
  60 inline bool LinearScanWalker::pd_init_regs_for_alloc(Interval* cur) {
  61   return false; // No special case behaviours.
  62 }
  63 
  64 #endif // CPU_S390_VM_C1_LINEARSCAN_S390_HPP