b3b81196aa
Now that we're using c++17, the type_traits with a ::value member have a _v alias which reduces verbosity. Or on other words std::is_integral<T>::value can be replaced with std::is_integral_v<T> Make this substitution throughout the code base. In places where gem5 introduced it's own similar templates, add a V alias, spelled differently to match gem5's internal style. gem5: :IsVarArgs<T>::value => gem5::IsVarArgsV<T> Change-Id: I1d84ffc4a236ad699471569e7916ec17fe5f109a Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48604 Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br> Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu> Tested-by: kokoro <noreply+kokoro@google.com>
203 lines
6.2 KiB
C++
203 lines
6.2 KiB
C++
/*
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* Copyright (c) 2004 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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//The purpose of this file is to provide endainness conversion utility
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//functions. Depending on the endianness of the guest system, either
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//the LittleEndianGuest or BigEndianGuest namespace is used.
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#ifndef __SIM_BYTE_SWAP_HH__
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#define __SIM_BYTE_SWAP_HH__
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// This lets us figure out what the byte order of the host system is
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#if defined(__linux__)
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#include <endian.h>
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// If this is a linux system, lets used the optimized definitions if they exist.
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// If one doesn't exist, we pretty much get what is listed below, so it all
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// works out
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#include <byteswap.h>
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#elif defined (__sun)
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#include <sys/isa_defs.h>
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#else
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#include <machine/endian.h>
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#endif
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#if defined(__APPLE__)
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#include <libkern/OSByteOrder.h>
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#endif
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#include <type_traits>
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#include "base/types.hh"
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#include "enums/ByteOrder.hh"
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struct vring_used_elem;
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struct vring_desc;
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namespace gem5
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{
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// These functions actually perform the swapping for parameters of various bit
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// lengths.
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inline uint64_t
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swap_byte64(uint64_t x)
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{
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#if defined(__linux__)
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return bswap_64(x);
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#elif defined(__APPLE__)
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return OSSwapInt64(x);
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#else
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return (uint64_t)((((uint64_t)(x) & 0xff) << 56) |
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((uint64_t)(x) & 0xff00ULL) << 40 |
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((uint64_t)(x) & 0xff0000ULL) << 24 |
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((uint64_t)(x) & 0xff000000ULL) << 8 |
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((uint64_t)(x) & 0xff00000000ULL) >> 8 |
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((uint64_t)(x) & 0xff0000000000ULL) >> 24 |
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((uint64_t)(x) & 0xff000000000000ULL) >> 40 |
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((uint64_t)(x) & 0xff00000000000000ULL) >> 56) ;
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#endif
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}
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inline uint32_t
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swap_byte32(uint32_t x)
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{
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#if defined(__linux__)
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return bswap_32(x);
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#elif defined(__APPLE__)
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return OSSwapInt32(x);
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#else
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return (uint32_t)(((uint32_t)(x) & 0xff) << 24 |
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((uint32_t)(x) & 0xff00) << 8 | ((uint32_t)(x) & 0xff0000) >> 8 |
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((uint32_t)(x) & 0xff000000) >> 24);
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#endif
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}
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inline uint16_t
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swap_byte16(uint16_t x)
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{
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#if defined(__linux__)
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return bswap_16(x);
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#elif defined(__APPLE__)
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return OSSwapInt16(x);
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#else
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return (uint16_t)(((uint16_t)(x) & 0xff) << 8 |
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((uint16_t)(x) & 0xff00) >> 8);
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#endif
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}
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template <typename T>
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inline std::enable_if_t<
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sizeof(T) == 8 && std::is_convertible_v<T, uint64_t>, T>
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swap_byte(T x)
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{
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return swap_byte64((uint64_t)x);
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}
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template <typename T>
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inline std::enable_if_t<
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sizeof(T) == 4 && std::is_convertible_v<T, uint32_t>, T>
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swap_byte(T x)
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{
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return swap_byte32((uint32_t)x);
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}
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template <typename T>
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inline std::enable_if_t<
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sizeof(T) == 2 && std::is_convertible_v<T, uint16_t>, T>
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swap_byte(T x)
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{
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return swap_byte16((uint16_t)x);
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}
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template <typename T>
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inline std::enable_if_t<
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sizeof(T) == 1 && std::is_convertible_v<T, uint8_t>, T>
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swap_byte(T x)
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{
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return x;
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}
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// Make the function visible in case we need to declare a version of it for
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// other types
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template <typename T>
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std::enable_if_t<std::is_same_v<T, vring_used_elem>, T>
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swap_byte(T v);
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template <typename T>
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std::enable_if_t<std::is_same_v<T, vring_desc>, T>
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swap_byte(T v);
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template <typename T, size_t N>
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inline std::array<T, N>
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swap_byte(std::array<T, N> a)
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{
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for (T &v: a)
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v = swap_byte(v);
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return a;
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}
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//The conversion functions with fixed endianness on both ends don't need to
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//be in a namespace
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template <typename T> inline T betole(T value) {return swap_byte(value);}
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template <typename T> inline T letobe(T value) {return swap_byte(value);}
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//For conversions not involving the guest system, we can define the functions
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//conditionally based on the BYTE_ORDER macro and outside of the namespaces
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#if (defined(_BIG_ENDIAN) || !defined(_LITTLE_ENDIAN)) && BYTE_ORDER == BIG_ENDIAN
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const ByteOrder HostByteOrder = ByteOrder::big;
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template <typename T> inline T htole(T value) {return swap_byte(value);}
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template <typename T> inline T letoh(T value) {return swap_byte(value);}
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template <typename T> inline T htobe(T value) {return value;}
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template <typename T> inline T betoh(T value) {return value;}
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#elif defined(_LITTLE_ENDIAN) || BYTE_ORDER == LITTLE_ENDIAN
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const ByteOrder HostByteOrder = ByteOrder::little;
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template <typename T> inline T htole(T value) {return value;}
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template <typename T> inline T letoh(T value) {return value;}
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template <typename T> inline T htobe(T value) {return swap_byte(value);}
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template <typename T> inline T betoh(T value) {return swap_byte(value);}
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#else
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#error Invalid Endianess
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#endif
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template <typename T>
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inline T htog(T value, ByteOrder guest_byte_order)
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{
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return guest_byte_order == ByteOrder::big ?
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htobe(value) : htole(value);
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}
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template <typename T>
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inline T gtoh(T value, ByteOrder guest_byte_order)
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{
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return guest_byte_order == ByteOrder::big ?
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betoh(value) : letoh(value);
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}
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} // namespace gem5
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#endif // __SIM_BYTE_SWAP_HH__
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