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Diffstat (limited to 'cpu/o3/rename_map.cc')
| -rw-r--r-- | cpu/o3/rename_map.cc | 346 |
1 files changed, 0 insertions, 346 deletions
diff --git a/cpu/o3/rename_map.cc b/cpu/o3/rename_map.cc deleted file mode 100644 index 10963f7de..000000000 --- a/cpu/o3/rename_map.cc +++ /dev/null @@ -1,346 +0,0 @@ -/* - * Copyright (c) 2004-2005 The Regents of The University of Michigan - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer; - * redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution; - * neither the name of the copyright holders nor the names of its - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include <vector> - -#include "cpu/o3/rename_map.hh" - -using namespace std; - -// Todo: Consider making functions inline. Avoid having things that are -// using the zero register or misc registers from adding on the registers -// to the free list. Possibly remove the direct communication between -// this and the freelist. Considering making inline bool functions that -// determine if the register is a logical int, logical fp, physical int, -// physical fp, etc. - -SimpleRenameMap::SimpleRenameMap(unsigned _numLogicalIntRegs, - unsigned _numPhysicalIntRegs, - unsigned _numLogicalFloatRegs, - unsigned _numPhysicalFloatRegs, - unsigned _numMiscRegs, - RegIndex _intZeroReg, - RegIndex _floatZeroReg) - : numLogicalIntRegs(_numLogicalIntRegs), - numPhysicalIntRegs(_numPhysicalIntRegs), - numLogicalFloatRegs(_numLogicalFloatRegs), - numPhysicalFloatRegs(_numPhysicalFloatRegs), - numMiscRegs(_numMiscRegs), - intZeroReg(_intZeroReg), - floatZeroReg(_floatZeroReg) -{ - DPRINTF(Rename, "Rename: Creating rename map. Phys: %i / %i, Float: " - "%i / %i.\n", numLogicalIntRegs, numPhysicalIntRegs, - numLogicalFloatRegs, numPhysicalFloatRegs); - - numLogicalRegs = numLogicalIntRegs + numLogicalFloatRegs; - - numPhysicalRegs = numPhysicalIntRegs + numPhysicalFloatRegs; - - //Create the rename maps, and their scoreboards. - intRenameMap = new RenameEntry[numLogicalIntRegs]; - floatRenameMap = new RenameEntry[numLogicalRegs]; - - // Should combine this into one scoreboard. - intScoreboard.resize(numPhysicalIntRegs); - floatScoreboard.resize(numPhysicalRegs); - miscScoreboard.resize(numPhysicalRegs + numMiscRegs); - - // Initialize the entries in the integer rename map to point to the - // physical registers of the same index, and consider each register - // ready until the first rename occurs. - for (RegIndex index = 0; index < numLogicalIntRegs; ++index) - { - intRenameMap[index].physical_reg = index; - intScoreboard[index] = 1; - } - - // Initialize the rest of the physical registers (the ones that don't - // directly map to a logical register) as unready. - for (PhysRegIndex index = numLogicalIntRegs; - index < numPhysicalIntRegs; - ++index) - { - intScoreboard[index] = 0; - } - - int float_reg_idx = numPhysicalIntRegs; - - // Initialize the entries in the floating point rename map to point to - // the physical registers of the same index, and consider each register - // ready until the first rename occurs. - // Although the index refers purely to architected registers, because - // the floating reg indices come after the integer reg indices, they - // may exceed the size of a normal RegIndex (short). - for (PhysRegIndex index = numLogicalIntRegs; - index < numLogicalRegs; ++index) - { - floatRenameMap[index].physical_reg = float_reg_idx++; - } - - for (PhysRegIndex index = numPhysicalIntRegs; - index < numPhysicalIntRegs + numLogicalFloatRegs; ++index) - { - floatScoreboard[index] = 1; - } - - // Initialize the rest of the physical registers (the ones that don't - // directly map to a logical register) as unready. - for (PhysRegIndex index = numPhysicalIntRegs + numLogicalFloatRegs; - index < numPhysicalRegs; - ++index) - { - floatScoreboard[index] = 0; - } - - // Initialize the entries in the misc register scoreboard to be ready. - for (PhysRegIndex index = numPhysicalRegs; - index < numPhysicalRegs + numMiscRegs; ++index) - { - miscScoreboard[index] = 1; - } -} - -SimpleRenameMap::~SimpleRenameMap() -{ - // Delete the rename maps as they were allocated with new. - delete [] intRenameMap; - delete [] floatRenameMap; -} - -void -SimpleRenameMap::setFreeList(SimpleFreeList *fl_ptr) -{ - //Setup the interface to the freelist. - freeList = fl_ptr; -} - - -// Don't allow this stage to fault; force that check to the rename stage. -// Simply ask to rename a logical register and get back a new physical -// register index. -SimpleRenameMap::RenameInfo -SimpleRenameMap::rename(RegIndex arch_reg) -{ - PhysRegIndex renamed_reg; - PhysRegIndex prev_reg; - - if (arch_reg < numLogicalIntRegs) { - - // Record the current physical register that is renamed to the - // requested architected register. - prev_reg = intRenameMap[arch_reg].physical_reg; - - // If it's not referencing the zero register, then mark the register - // as not ready. - if (arch_reg != intZeroReg) { - // Get a free physical register to rename to. - renamed_reg = freeList->getIntReg(); - - // Update the integer rename map. - intRenameMap[arch_reg].physical_reg = renamed_reg; - - assert(renamed_reg >= 0 && renamed_reg < numPhysicalIntRegs); - - // Mark register as not ready. - intScoreboard[renamed_reg] = false; - } else { - // Otherwise return the zero register so nothing bad happens. - renamed_reg = intZeroReg; - } - } else if (arch_reg < numLogicalRegs) { - // Subtract off the base offset for floating point registers. -// arch_reg = arch_reg - numLogicalIntRegs; - - // Record the current physical register that is renamed to the - // requested architected register. - prev_reg = floatRenameMap[arch_reg].physical_reg; - - // If it's not referencing the zero register, then mark the register - // as not ready. - if (arch_reg != floatZeroReg) { - // Get a free floating point register to rename to. - renamed_reg = freeList->getFloatReg(); - - // Update the floating point rename map. - floatRenameMap[arch_reg].physical_reg = renamed_reg; - - assert(renamed_reg < numPhysicalRegs && - renamed_reg >= numPhysicalIntRegs); - - // Mark register as not ready. - floatScoreboard[renamed_reg] = false; - } else { - // Otherwise return the zero register so nothing bad happens. - renamed_reg = floatZeroReg; - } - } else { - // Subtract off the base offset for miscellaneous registers. - arch_reg = arch_reg - numLogicalRegs; - - // No renaming happens to the misc. registers. They are simply the - // registers that come after all the physical registers; thus - // take the base architected register and add the physical registers - // to it. - renamed_reg = arch_reg + numPhysicalRegs; - - // Set the previous register to the same register; mainly it must be - // known that the prev reg was outside the range of normal registers - // so the free list can avoid adding it. - prev_reg = renamed_reg; - - assert(renamed_reg < numPhysicalRegs + numMiscRegs); - - miscScoreboard[renamed_reg] = false; - } - - return RenameInfo(renamed_reg, prev_reg); -} - -//Perhaps give this a pair as a return value, of the physical register -//and whether or not it's ready. -PhysRegIndex -SimpleRenameMap::lookup(RegIndex arch_reg) -{ - if (arch_reg < numLogicalIntRegs) { - return intRenameMap[arch_reg].physical_reg; - } else if (arch_reg < numLogicalRegs) { - // Subtract off the base FP offset. -// arch_reg = arch_reg - numLogicalIntRegs; - - return floatRenameMap[arch_reg].physical_reg; - } else { - // Subtract off the misc registers offset. - arch_reg = arch_reg - numLogicalRegs; - - // Misc. regs don't rename, so simply add the base arch reg to - // the number of physical registers. - return numPhysicalRegs + arch_reg; - } -} - -bool -SimpleRenameMap::isReady(PhysRegIndex phys_reg) -{ - if (phys_reg < numPhysicalIntRegs) { - return intScoreboard[phys_reg]; - } else if (phys_reg < numPhysicalRegs) { - - // Subtract off the base FP offset. -// phys_reg = phys_reg - numPhysicalIntRegs; - - return floatScoreboard[phys_reg]; - } else { - // Subtract off the misc registers offset. -// phys_reg = phys_reg - numPhysicalRegs; - - return miscScoreboard[phys_reg]; - } -} - -// In this implementation the miscellaneous registers do not actually rename, -// so this function does not allow you to try to change their mappings. -void -SimpleRenameMap::setEntry(RegIndex arch_reg, PhysRegIndex renamed_reg) -{ - if (arch_reg < numLogicalIntRegs) { - DPRINTF(Rename, "Rename Map: Integer register %i being set to %i.\n", - (int)arch_reg, renamed_reg); - - intRenameMap[arch_reg].physical_reg = renamed_reg; - } else { - assert(arch_reg < (numLogicalIntRegs + numLogicalFloatRegs)); - - DPRINTF(Rename, "Rename Map: Float register %i being set to %i.\n", - (int)arch_reg - numLogicalIntRegs, renamed_reg); - - floatRenameMap[arch_reg].physical_reg = renamed_reg; - } -} - -void -SimpleRenameMap::squash(vector<RegIndex> freed_regs, - vector<UnmapInfo> unmaps) -{ - panic("Not sure this function should be called."); - - // Not sure the rename map should be able to access the free list - // like this. - while (!freed_regs.empty()) { - RegIndex free_register = freed_regs.back(); - - if (free_register < numPhysicalIntRegs) { - freeList->addIntReg(free_register); - } else { - // Subtract off the base FP dependence tag. - free_register = free_register - numPhysicalIntRegs; - freeList->addFloatReg(free_register); - } - - freed_regs.pop_back(); - } - - // Take unmap info and roll back the rename map. -} - -void -SimpleRenameMap::markAsReady(PhysRegIndex ready_reg) -{ - DPRINTF(Rename, "Rename map: Marking register %i as ready.\n", - (int)ready_reg); - - if (ready_reg < numPhysicalIntRegs) { - assert(ready_reg >= 0); - - intScoreboard[ready_reg] = 1; - } else if (ready_reg < numPhysicalRegs) { - - // Subtract off the base FP offset. -// ready_reg = ready_reg - numPhysicalIntRegs; - - floatScoreboard[ready_reg] = 1; - } else { - //Subtract off the misc registers offset. -// ready_reg = ready_reg - numPhysicalRegs; - - miscScoreboard[ready_reg] = 1; - } -} - -int -SimpleRenameMap::numFreeEntries() -{ - int free_int_regs = freeList->numFreeIntRegs(); - int free_float_regs = freeList->numFreeFloatRegs(); - - if (free_int_regs < free_float_regs) { - return free_int_regs; - } else { - return free_float_regs; - } -} |