1 /*
   2  * Copyright (c) 2005, 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 #include "incls/_precompiled.incl"
  26 #include "incls/_c1_LinearScan_x86.cpp.incl"


  27 
  28 
  29 //----------------------------------------------------------------------
  30 // Allocation of FPU stack slots (Intel x86 only)
  31 //----------------------------------------------------------------------
  32 
  33 void LinearScan::allocate_fpu_stack() {
  34   // First compute which FPU registers are live at the start of each basic block
  35   // (To minimize the amount of work we have to do if we have to merge FPU stacks)
  36   if (ComputeExactFPURegisterUsage) {
  37     Interval* intervals_in_register, *intervals_in_memory;
  38     create_unhandled_lists(&intervals_in_register, &intervals_in_memory, is_in_fpu_register, NULL);
  39 
  40     // ignore memory intervals by overwriting intervals_in_memory
  41     // the dummy interval is needed to enforce the walker to walk until the given id:
  42     // without it, the walker stops when the unhandled-list is empty -> live information
  43     // beyond this point would be incorrect.
  44     Interval* dummy_interval = new Interval(any_reg);
  45     dummy_interval->add_range(max_jint - 2, max_jint - 1);
  46     dummy_interval->set_next(Interval::end());

   1 /*
   2  * Copyright (c) 2005, 2010, 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 #include "precompiled.hpp"
  26 #include "c1/c1_Instruction.hpp"
  27 #include "c1/c1_LinearScan.hpp"
  28 #include "utilities/bitMap.inline.hpp"
  29 
  30 
  31 //----------------------------------------------------------------------
  32 // Allocation of FPU stack slots (Intel x86 only)
  33 //----------------------------------------------------------------------
  34 
  35 void LinearScan::allocate_fpu_stack() {
  36   // First compute which FPU registers are live at the start of each basic block
  37   // (To minimize the amount of work we have to do if we have to merge FPU stacks)
  38   if (ComputeExactFPURegisterUsage) {
  39     Interval* intervals_in_register, *intervals_in_memory;
  40     create_unhandled_lists(&intervals_in_register, &intervals_in_memory, is_in_fpu_register, NULL);
  41 
  42     // ignore memory intervals by overwriting intervals_in_memory
  43     // the dummy interval is needed to enforce the walker to walk until the given id:
  44     // without it, the walker stops when the unhandled-list is empty -> live information
  45     // beyond this point would be incorrect.
  46     Interval* dummy_interval = new Interval(any_reg);
  47     dummy_interval->add_range(max_jint - 2, max_jint - 1);
  48     dummy_interval->set_next(Interval::end());