regfile.hh revision 9915
1/* 2 * Copyright (c) 2004-2005 The Regents of The University of Michigan 3 * Copyright (c) 2013 Advanced Micro Devices, Inc. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer; 10 * redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution; 13 * neither the name of the copyright holders nor the names of its 14 * contributors may be used to endorse or promote products derived from 15 * this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * Authors: Kevin Lim 30 * Gabe Black 31 */ 32 33#ifndef __CPU_O3_REGFILE_HH__ 34#define __CPU_O3_REGFILE_HH__ 35 36#include <vector> 37 38#include "arch/isa_traits.hh" 39#include "arch/kernel_stats.hh" 40#include "arch/types.hh" 41#include "base/trace.hh" 42#include "config/the_isa.hh" 43#include "cpu/o3/comm.hh" 44#include "debug/IEW.hh" 45 46/** 47 * Simple physical register file class. 48 */ 49class PhysRegFile 50{ 51 private: 52 53 typedef TheISA::IntReg IntReg; 54 typedef TheISA::FloatReg FloatReg; 55 typedef TheISA::FloatRegBits FloatRegBits; 56 57 typedef union { 58 FloatReg d; 59 FloatRegBits q; 60 } PhysFloatReg; 61 62 /** Integer register file. */ 63 IntReg *intRegFile; 64 65 /** Floating point register file. */ 66 PhysFloatReg *floatRegFile; 67 68 /** 69 * The first floating-point physical register index. The physical 70 * register file has a single continuous index space, with the 71 * initial indices mapping to the integer registers, followed 72 * immediately by the floating-point registers. Thus the first 73 * floating-point index is equal to the number of integer 74 * registers. 75 */ 76 unsigned baseFloatRegIndex; 77 78 /** Total number of physical registers. */ 79 unsigned totalNumRegs; 80 81 public: 82 /** 83 * Constructs a physical register file with the specified amount of 84 * integer and floating point registers. 85 */ 86 PhysRegFile(unsigned _numPhysicalIntRegs, 87 unsigned _numPhysicalFloatRegs); 88 89 /** 90 * Destructor to free resources 91 */ 92 ~PhysRegFile(); 93 94 /** @return the number of integer physical registers. */ 95 unsigned numIntPhysRegs() const { return baseFloatRegIndex; } 96 97 /** @return the number of floating-point physical registers. */ 98 unsigned numFloatPhysRegs() const 99 { return totalNumRegs - baseFloatRegIndex; } 100 101 /** @return the total number of physical registers. */ 102 unsigned totalNumPhysRegs() const { return totalNumRegs; } 103 104 /** 105 * @return true if the specified physical register index 106 * corresponds to an integer physical register. 107 */ 108 bool isIntPhysReg(PhysRegIndex reg_idx) const 109 { 110 return 0 <= reg_idx && reg_idx < baseFloatRegIndex; 111 } 112 113 /** 114 * @return true if the specified physical register index 115 * corresponds to a floating-point physical register. 116 */ 117 bool isFloatPhysReg(PhysRegIndex reg_idx) const 118 { 119 return (baseFloatRegIndex <= reg_idx && reg_idx < totalNumRegs); 120 } 121 122 /** Reads an integer register. */ 123 uint64_t readIntReg(PhysRegIndex reg_idx) const 124 { 125 assert(isIntPhysReg(reg_idx)); 126 127 DPRINTF(IEW, "RegFile: Access to int register %i, has data " 128 "%#x\n", int(reg_idx), intRegFile[reg_idx]); 129 return intRegFile[reg_idx]; 130 } 131 132 /** Reads a floating point register (double precision). */ 133 FloatReg readFloatReg(PhysRegIndex reg_idx) const 134 { 135 assert(isFloatPhysReg(reg_idx)); 136 137 // Remove the base Float reg dependency. 138 PhysRegIndex reg_offset = reg_idx - baseFloatRegIndex; 139 140 DPRINTF(IEW, "RegFile: Access to float register %i, has " 141 "data %#x\n", int(reg_idx), floatRegFile[reg_offset].q); 142 143 return floatRegFile[reg_offset].d; 144 } 145 146 FloatRegBits readFloatRegBits(PhysRegIndex reg_idx) const 147 { 148 assert(isFloatPhysReg(reg_idx)); 149 150 // Remove the base Float reg dependency. 151 PhysRegIndex reg_offset = reg_idx - baseFloatRegIndex; 152 153 FloatRegBits floatRegBits = floatRegFile[reg_offset].q; 154 155 DPRINTF(IEW, "RegFile: Access to float register %i as int, " 156 "has data %#x\n", int(reg_idx), (uint64_t)floatRegBits); 157 158 return floatRegBits; 159 } 160 161 /** Sets an integer register to the given value. */ 162 void setIntReg(PhysRegIndex reg_idx, uint64_t val) 163 { 164 assert(isIntPhysReg(reg_idx)); 165 166 DPRINTF(IEW, "RegFile: Setting int register %i to %#x\n", 167 int(reg_idx), val); 168 169 if (reg_idx != TheISA::ZeroReg) 170 intRegFile[reg_idx] = val; 171 } 172 173 /** Sets a double precision floating point register to the given value. */ 174 void setFloatReg(PhysRegIndex reg_idx, FloatReg val) 175 { 176 assert(isFloatPhysReg(reg_idx)); 177 178 // Remove the base Float reg dependency. 179 PhysRegIndex reg_offset = reg_idx - baseFloatRegIndex; 180 181 DPRINTF(IEW, "RegFile: Setting float register %i to %#x\n", 182 int(reg_idx), (uint64_t)val); 183 184#if THE_ISA == ALPHA_ISA 185 if (reg_offset != TheISA::ZeroReg) 186#endif 187 floatRegFile[reg_offset].d = val; 188 } 189 190 void setFloatRegBits(PhysRegIndex reg_idx, FloatRegBits val) 191 { 192 assert(isFloatPhysReg(reg_idx)); 193 194 // Remove the base Float reg dependency. 195 PhysRegIndex reg_offset = reg_idx - baseFloatRegIndex; 196 197 DPRINTF(IEW, "RegFile: Setting float register %i to %#x\n", 198 int(reg_idx), (uint64_t)val); 199 200 floatRegFile[reg_offset].q = val; 201 } 202 203}; 204 205 206inline 207PhysRegFile::PhysRegFile(unsigned _numPhysicalIntRegs, 208 unsigned _numPhysicalFloatRegs) 209 : baseFloatRegIndex(_numPhysicalIntRegs), 210 totalNumRegs(_numPhysicalIntRegs + _numPhysicalFloatRegs) 211{ 212 intRegFile = new IntReg[_numPhysicalIntRegs]; 213 floatRegFile = new PhysFloatReg[_numPhysicalFloatRegs]; 214 215 memset(intRegFile, 0, sizeof(IntReg) * _numPhysicalIntRegs); 216 memset(floatRegFile, 0, sizeof(PhysFloatReg) * _numPhysicalFloatRegs); 217} 218 219 220inline 221PhysRegFile::~PhysRegFile() 222{ 223 delete intRegFile; 224 delete floatRegFile; 225} 226 227#endif //__CPU_O3_REGFILE_HH__ 228