free_list.cc revision 2665
1/* 2 * Copyright (c) 2004-2005 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Kevin Lim 29 */ 30 31#include "base/trace.hh" 32 33#include "cpu/o3/free_list.hh" 34 35SimpleFreeList::SimpleFreeList(unsigned _numLogicalIntRegs, 36 unsigned _numPhysicalIntRegs, 37 unsigned _numLogicalFloatRegs, 38 unsigned _numPhysicalFloatRegs) 39 : numLogicalIntRegs(_numLogicalIntRegs), 40 numPhysicalIntRegs(_numPhysicalIntRegs), 41 numLogicalFloatRegs(_numLogicalFloatRegs), 42 numPhysicalFloatRegs(_numPhysicalFloatRegs), 43 numPhysicalRegs(numPhysicalIntRegs + numPhysicalFloatRegs) 44{ 45 DPRINTF(FreeList, "FreeList: Creating new free list object.\n"); 46 47 // DEBUG stuff. 48 freeIntRegsScoreboard.resize(numPhysicalIntRegs); 49 50 freeFloatRegsScoreboard.resize(numPhysicalRegs); 51 52 for (PhysRegIndex i = 0; i < numLogicalIntRegs; ++i) { 53 freeIntRegsScoreboard[i] = 0; 54 } 55 56 // Put all of the extra physical registers onto the free list. This 57 // means excluding all of the base logical registers. 58 for (PhysRegIndex i = numLogicalIntRegs; 59 i < numPhysicalIntRegs; ++i) 60 { 61 freeIntRegs.push(i); 62 63 freeIntRegsScoreboard[i] = 1; 64 } 65 66 for (PhysRegIndex i = 0; i < numPhysicalIntRegs + numLogicalFloatRegs; 67 ++i) 68 { 69 freeFloatRegsScoreboard[i] = 0; 70 } 71 72 // Put all of the extra physical registers onto the free list. This 73 // means excluding all of the base logical registers. Because the 74 // float registers' indices start where the physical registers end, 75 // some math must be done to determine where the free registers start. 76 for (PhysRegIndex i = numPhysicalIntRegs + numLogicalFloatRegs; 77 i < numPhysicalRegs; ++i) 78 { 79 freeFloatRegs.push(i); 80 81 freeFloatRegsScoreboard[i] = 1; 82 } 83} 84 85