diff options
author | Korey Sewell <ksewell@umich.edu> | 2009-05-12 15:01:14 -0400 |
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committer | Korey Sewell <ksewell@umich.edu> | 2009-05-12 15:01:14 -0400 |
commit | f41df0ee08467711c613faadf9879052ab7196ed (patch) | |
tree | b5ad5be9cecdec14d6f646e099edf9efcc8b38b0 /src/cpu/o3/btb.cc | |
parent | 5127ea226a0a2cd75334c5af4cb182a1fd9b6cf1 (diff) | |
download | gem5-f41df0ee08467711c613faadf9879052ab7196ed.tar.xz |
inorder-o3: allow both to compile together
allow InOrder and O3CPU to be compiled at the same time: need to make branch prediction filed shared by both models
Diffstat (limited to 'src/cpu/o3/btb.cc')
-rw-r--r-- | src/cpu/o3/btb.cc | 134 |
1 files changed, 0 insertions, 134 deletions
diff --git a/src/cpu/o3/btb.cc b/src/cpu/o3/btb.cc deleted file mode 100644 index 93d6ee768..000000000 --- a/src/cpu/o3/btb.cc +++ /dev/null @@ -1,134 +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. - * - * Authors: Kevin Lim - */ - -#include "base/intmath.hh" -#include "base/trace.hh" -#include "cpu/o3/btb.hh" - -DefaultBTB::DefaultBTB(unsigned _numEntries, - unsigned _tagBits, - unsigned _instShiftAmt) - : numEntries(_numEntries), - tagBits(_tagBits), - instShiftAmt(_instShiftAmt) -{ - DPRINTF(Fetch, "BTB: Creating BTB object.\n"); - - if (!isPowerOf2(numEntries)) { - fatal("BTB entries is not a power of 2!"); - } - - btb.resize(numEntries); - - for (int i = 0; i < numEntries; ++i) { - btb[i].valid = false; - } - - idxMask = numEntries - 1; - - tagMask = (1 << tagBits) - 1; - - tagShiftAmt = instShiftAmt + floorLog2(numEntries); -} - -void -DefaultBTB::reset() -{ - for (int i = 0; i < numEntries; ++i) { - btb[i].valid = false; - } -} - -inline -unsigned -DefaultBTB::getIndex(const Addr &inst_PC) -{ - // Need to shift PC over by the word offset. - return (inst_PC >> instShiftAmt) & idxMask; -} - -inline -Addr -DefaultBTB::getTag(const Addr &inst_PC) -{ - return (inst_PC >> tagShiftAmt) & tagMask; -} - -bool -DefaultBTB::valid(const Addr &inst_PC, unsigned tid) -{ - unsigned btb_idx = getIndex(inst_PC); - - Addr inst_tag = getTag(inst_PC); - - assert(btb_idx < numEntries); - - if (btb[btb_idx].valid - && inst_tag == btb[btb_idx].tag - && btb[btb_idx].tid == tid) { - return true; - } else { - return false; - } -} - -// @todo Create some sort of return struct that has both whether or not the -// address is valid, and also the address. For now will just use addr = 0 to -// represent invalid entry. -Addr -DefaultBTB::lookup(const Addr &inst_PC, unsigned tid) -{ - unsigned btb_idx = getIndex(inst_PC); - - Addr inst_tag = getTag(inst_PC); - - assert(btb_idx < numEntries); - - if (btb[btb_idx].valid - && inst_tag == btb[btb_idx].tag - && btb[btb_idx].tid == tid) { - return btb[btb_idx].target; - } else { - return 0; - } -} - -void -DefaultBTB::update(const Addr &inst_PC, const Addr &target, unsigned tid) -{ - unsigned btb_idx = getIndex(inst_PC); - - assert(btb_idx < numEntries); - - btb[btb_idx].tid = tid; - btb[btb_idx].valid = true; - btb[btb_idx].target = target; - btb[btb_idx].tag = getTag(inst_PC); -} |