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# Copyright (c) 2003-2005 The Regents of The University of Michigan
# Copyright (c) 2013 Advanced Micro Devices, Inc.
# 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: Steve Reinhardt
from m5.params import *
# Set of boolean static instruction properties.
#
# Notes:
# - The IsInteger and IsFloating flags are based on the class of registers
# accessed by the instruction. Although most instructions will have exactly
# one of these two flags set, it is possible for an instruction to have
# neither (e.g., direct unconditional branches, memory barriers) or both
# (e.g., an FP/int conversion).
# - If IsMemRef is set, then exactly one of IsLoad or IsStore will be set.
# - If IsControl is set, then exactly one of IsDirectControl or IsIndirect
# Control will be set, and exactly one of IsCondControl or IsUncondControl
# will be set.
# - IsSerializing, IsMemBarrier, and IsWriteBarrier are implemented as flags
# since in the current model there's no other way for instructions to inject
# behavior into the pipeline outside of fetch. Once we go to an exec-in-exec
# CPU model we should be able to get rid of these flags and implement this
# behavior via the execute() methods.
class StaticInstFlags(Enum):
wrapper_name = 'StaticInstFlags'
wrapper_is_struct = True
enum_name = 'Flags'
vals = [
'IsNop', # Is a no-op (no effect at all).
'IsInteger', # References integer regs.
'IsFloating', # References FP regs.
'IsCC', # References CC regs.
'IsMemRef', # References memory (load, store, or prefetch)
'IsLoad', # Reads from memory (load or prefetch).
'IsStore', # Writes to memory.
'IsStoreConditional', # Store conditional instruction.
'IsIndexed', # Accesses memory with an indexed address
# computation
'IsInstPrefetch', # Instruction-cache prefetch.
'IsDataPrefetch', # Data-cache prefetch.
'IsControl', # Control transfer instruction.
'IsDirectControl', # PC relative control transfer.
'IsIndirectControl',# Register indirect control transfer.
'IsCondControl', # Conditional control transfer.
'IsUncondControl', # Unconditional control transfer.
'IsCall', # Subroutine call.
'IsReturn', # Subroutine return.
'IsCondDelaySlot', # Conditional Delay-Slot Instruction
'IsThreadSync', # Thread synchronization operation.
'IsSerializing', # Serializes pipeline: won't execute until all
# older instructions have committed.
'IsSerializeBefore',
'IsSerializeAfter',
'IsMemBarrier', # Is a memory barrier
'IsWriteBarrier', # Is a write barrier
'IsReadBarrier', # Is a read barrier
'IsERET', # <- Causes the IFU to stall (MIPS ISA)
'IsNonSpeculative', # Should not be executed speculatively
'IsQuiesce', # Is a quiesce instruction
'IsIprAccess', # Accesses IPRs
'IsUnverifiable', # Can't be verified by a checker
'IsSyscall', # Causes a system call to be emulated in syscall
# emulation mode.
# Flags for microcode
'IsMacroop', # Is a macroop containing microops
'IsMicroop', # Is a microop
'IsDelayedCommit', # This microop doesn't commit right away
'IsLastMicroop', # This microop ends a microop sequence
'IsFirstMicroop', # This microop begins a microop sequence
# This flag doesn't do anything yet
'IsMicroBranch', # This microop branches within the microcode for
# a macroop
'IsDspOp',
'IsSquashAfter' # Squash all uncommitted state after executed
]
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