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# Copyright (c) 2018 Inria
# 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: Daniel Carvalho
from m5.params import *
from m5.proxy import *
from m5.SimObject import SimObject
class BaseCacheCompressor(SimObject):
type = 'BaseCacheCompressor'
abstract = True
cxx_header = "mem/cache/compressors/base.hh"
block_size = Param.Int(Parent.cache_line_size, "Block size in bytes")
size_threshold = Param.Unsigned(Parent.cache_line_size, "Minimum size, "
"in bytes, in which a block must be compressed to. Otherwise it is "
"stored in its uncompressed state")
class BaseDictionaryCompressor(BaseCacheCompressor):
type = 'BaseDictionaryCompressor'
abstract = True
cxx_header = "mem/cache/compressors/dictionary_compressor.hh"
dictionary_size = Param.Int(Parent.cache_line_size,
"Number of dictionary entries")
class Base64Delta8(BaseDictionaryCompressor):
type = 'Base64Delta8'
cxx_class = 'Base64Delta8'
cxx_header = "mem/cache/compressors/base_delta.hh"
class Base64Delta16(BaseDictionaryCompressor):
type = 'Base64Delta16'
cxx_class = 'Base64Delta16'
cxx_header = "mem/cache/compressors/base_delta.hh"
class Base64Delta32(BaseDictionaryCompressor):
type = 'Base64Delta32'
cxx_class = 'Base64Delta32'
cxx_header = "mem/cache/compressors/base_delta.hh"
class Base32Delta8(BaseDictionaryCompressor):
type = 'Base32Delta8'
cxx_class = 'Base32Delta8'
cxx_header = "mem/cache/compressors/base_delta.hh"
class Base32Delta16(BaseDictionaryCompressor):
type = 'Base32Delta16'
cxx_class = 'Base32Delta16'
cxx_header = "mem/cache/compressors/base_delta.hh"
class Base16Delta8(BaseDictionaryCompressor):
type = 'Base16Delta8'
cxx_class = 'Base16Delta8'
cxx_header = "mem/cache/compressors/base_delta.hh"
class CPack(BaseDictionaryCompressor):
type = 'CPack'
cxx_class = 'CPack'
cxx_header = "mem/cache/compressors/cpack.hh"
class FPCD(BaseDictionaryCompressor):
type = 'FPCD'
cxx_class = 'FPCD'
cxx_header = "mem/cache/compressors/fpcd.hh"
dictionary_size = 2
class MultiCompressor(BaseCacheCompressor):
type = 'MultiCompressor'
cxx_class = 'MultiCompressor'
cxx_header = "mem/cache/compressors/multi.hh"
# Dummy default compressor list. This might not be an optimal choice,
# since these compressors have many overlapping patterns
compressors = VectorParam.BaseCacheCompressor([CPack(), FPCD()],
"Array of compressors")
class PerfectCompressor(BaseCacheCompressor):
type = 'PerfectCompressor'
cxx_class = 'PerfectCompressor'
cxx_header = "mem/cache/compressors/perfect.hh"
max_compression_ratio = Param.Int(2,
"Maximum compression ratio allowed")
compression_latency = Param.Cycles(1,
"Number of cycles to perform data compression")
decompression_latency = Param.Cycles(1,
"Number of cycles to perform data decompression")
class RepeatedQwordsCompressor(BaseDictionaryCompressor):
type = 'RepeatedQwordsCompressor'
cxx_class = 'RepeatedQwordsCompressor'
cxx_header = "mem/cache/compressors/repeated_qwords.hh"
class ZeroCompressor(BaseDictionaryCompressor):
type = 'ZeroCompressor'
cxx_class = 'ZeroCompressor'
cxx_header = "mem/cache/compressors/zero.hh"
class BDI(MultiCompressor):
compressors = [ZeroCompressor(), RepeatedQwordsCompressor(),
Base64Delta8(), Base64Delta16(), Base64Delta32(), Base32Delta8(),
Base32Delta16(), Base16Delta8()]
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