976f27487b
As highlighed on the mailing list gem5's writeback modeling can impact performance. This patch removes the limitation on maximum outstanding issued instructions, however the number that can writeback in a single cycle is still respected in instToCommit().
191 lines
6.1 KiB
Python
191 lines
6.1 KiB
Python
# Copyright (c) 2012 The Regents of The University of Michigan
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Authors: Ron Dreslinski
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from m5.objects import *
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# Simple ALU Instructions have a latency of 1
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class O3_ARM_v7a_Simple_Int(FUDesc):
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opList = [ OpDesc(opClass='IntAlu', opLat=1) ]
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count = 2
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# Complex ALU instructions have a variable latencies
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class O3_ARM_v7a_Complex_Int(FUDesc):
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opList = [ OpDesc(opClass='IntMult', opLat=3, issueLat=1),
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OpDesc(opClass='IntDiv', opLat=12, issueLat=12),
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OpDesc(opClass='IprAccess', opLat=3, issueLat=1) ]
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count = 1
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# Floating point and SIMD instructions
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class O3_ARM_v7a_FP(FUDesc):
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opList = [ OpDesc(opClass='SimdAdd', opLat=4),
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OpDesc(opClass='SimdAddAcc', opLat=4),
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OpDesc(opClass='SimdAlu', opLat=4),
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OpDesc(opClass='SimdCmp', opLat=4),
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OpDesc(opClass='SimdCvt', opLat=3),
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OpDesc(opClass='SimdMisc', opLat=3),
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OpDesc(opClass='SimdMult',opLat=5),
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OpDesc(opClass='SimdMultAcc',opLat=5),
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OpDesc(opClass='SimdShift',opLat=3),
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OpDesc(opClass='SimdShiftAcc', opLat=3),
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OpDesc(opClass='SimdSqrt', opLat=9),
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OpDesc(opClass='SimdFloatAdd',opLat=5),
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OpDesc(opClass='SimdFloatAlu',opLat=5),
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OpDesc(opClass='SimdFloatCmp', opLat=3),
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OpDesc(opClass='SimdFloatCvt', opLat=3),
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OpDesc(opClass='SimdFloatDiv', opLat=3),
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OpDesc(opClass='SimdFloatMisc', opLat=3),
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OpDesc(opClass='SimdFloatMult', opLat=3),
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OpDesc(opClass='SimdFloatMultAcc',opLat=1),
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OpDesc(opClass='SimdFloatSqrt', opLat=9),
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OpDesc(opClass='FloatAdd', opLat=5),
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OpDesc(opClass='FloatCmp', opLat=5),
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OpDesc(opClass='FloatCvt', opLat=5),
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OpDesc(opClass='FloatDiv', opLat=9, issueLat=9),
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OpDesc(opClass='FloatSqrt', opLat=33, issueLat=33),
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OpDesc(opClass='FloatMult', opLat=4) ]
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count = 2
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# Load/Store Units
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class O3_ARM_v7a_Load(FUDesc):
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opList = [ OpDesc(opClass='MemRead',opLat=2) ]
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count = 1
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class O3_ARM_v7a_Store(FUDesc):
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opList = [OpDesc(opClass='MemWrite',opLat=2) ]
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count = 1
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# Functional Units for this CPU
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class O3_ARM_v7a_FUP(FUPool):
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FUList = [O3_ARM_v7a_Simple_Int(), O3_ARM_v7a_Complex_Int(),
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O3_ARM_v7a_Load(), O3_ARM_v7a_Store(), O3_ARM_v7a_FP()]
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# Bi-Mode Branch Predictor
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class O3_ARM_v7a_BP(BranchPredictor):
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predType = "bi-mode"
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globalPredictorSize = 8192
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globalCtrBits = 2
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choicePredictorSize = 8192
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choiceCtrBits = 2
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BTBEntries = 2048
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BTBTagSize = 18
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RASSize = 16
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instShiftAmt = 2
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class O3_ARM_v7a_3(DerivO3CPU):
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LQEntries = 16
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SQEntries = 16
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LSQDepCheckShift = 0
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LFSTSize = 1024
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SSITSize = 1024
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decodeToFetchDelay = 1
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renameToFetchDelay = 1
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iewToFetchDelay = 1
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commitToFetchDelay = 1
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renameToDecodeDelay = 1
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iewToDecodeDelay = 1
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commitToDecodeDelay = 1
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iewToRenameDelay = 1
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commitToRenameDelay = 1
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commitToIEWDelay = 1
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fetchWidth = 3
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fetchBufferSize = 16
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fetchToDecodeDelay = 3
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decodeWidth = 3
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decodeToRenameDelay = 2
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renameWidth = 3
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renameToIEWDelay = 1
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issueToExecuteDelay = 1
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dispatchWidth = 6
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issueWidth = 8
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wbWidth = 8
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fuPool = O3_ARM_v7a_FUP()
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iewToCommitDelay = 1
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renameToROBDelay = 1
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commitWidth = 8
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squashWidth = 8
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trapLatency = 13
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backComSize = 5
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forwardComSize = 5
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numPhysIntRegs = 128
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numPhysFloatRegs = 192
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numIQEntries = 32
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numROBEntries = 40
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switched_out = False
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branchPred = O3_ARM_v7a_BP()
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# Instruction Cache
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class O3_ARM_v7a_ICache(BaseCache):
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hit_latency = 1
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response_latency = 1
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mshrs = 2
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tgts_per_mshr = 8
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size = '32kB'
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assoc = 2
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is_top_level = 'true'
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# Data Cache
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class O3_ARM_v7a_DCache(BaseCache):
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hit_latency = 2
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response_latency = 2
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mshrs = 6
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tgts_per_mshr = 8
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size = '32kB'
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assoc = 2
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write_buffers = 16
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is_top_level = 'true'
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# TLB Cache
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# Use a cache as a L2 TLB
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class O3_ARM_v7aWalkCache(BaseCache):
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hit_latency = 4
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response_latency = 4
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mshrs = 6
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tgts_per_mshr = 8
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size = '1kB'
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assoc = 8
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write_buffers = 16
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is_top_level = 'true'
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# L2 Cache
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class O3_ARM_v7aL2(BaseCache):
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hit_latency = 12
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response_latency = 12
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mshrs = 16
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tgts_per_mshr = 8
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size = '1MB'
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assoc = 16
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write_buffers = 8
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prefetch_on_access = 'true'
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# Simple stride prefetcher
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prefetcher = StridePrefetcher(degree=8, latency = 1)
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tags = RandomRepl()
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