mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-23 15:29:51 +00:00
4e96e52cbe
sections with the Mach-O S_{4,8,16}BYTE_LITERALS section types.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228465 91177308-0d34-0410-b5e6-96231b3b80d8
126 lines
3.9 KiB
C++
126 lines
3.9 KiB
C++
//===- SwapByteOrder.h - Generic and optimized byte swaps -------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file declares generic and optimized functions to swap the byte order of
|
|
// an integral type.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_SUPPORT_SWAPBYTEORDER_H
|
|
#define LLVM_SUPPORT_SWAPBYTEORDER_H
|
|
|
|
#include "llvm/Support/Compiler.h"
|
|
#include "llvm/Support/DataTypes.h"
|
|
#include <cstddef>
|
|
#include <limits>
|
|
|
|
namespace llvm {
|
|
namespace sys {
|
|
|
|
/// SwapByteOrder_16 - This function returns a byte-swapped representation of
|
|
/// the 16-bit argument.
|
|
inline uint16_t SwapByteOrder_16(uint16_t value) {
|
|
#if defined(_MSC_VER) && !defined(_DEBUG)
|
|
// The DLL version of the runtime lacks these functions (bug!?), but in a
|
|
// release build they're replaced with BSWAP instructions anyway.
|
|
return _byteswap_ushort(value);
|
|
#else
|
|
uint16_t Hi = value << 8;
|
|
uint16_t Lo = value >> 8;
|
|
return Hi | Lo;
|
|
#endif
|
|
}
|
|
|
|
/// SwapByteOrder_32 - This function returns a byte-swapped representation of
|
|
/// the 32-bit argument.
|
|
inline uint32_t SwapByteOrder_32(uint32_t value) {
|
|
#if defined(__llvm__) || (LLVM_GNUC_PREREQ(4, 3, 0) && !defined(__ICC))
|
|
return __builtin_bswap32(value);
|
|
#elif defined(_MSC_VER) && !defined(_DEBUG)
|
|
return _byteswap_ulong(value);
|
|
#else
|
|
uint32_t Byte0 = value & 0x000000FF;
|
|
uint32_t Byte1 = value & 0x0000FF00;
|
|
uint32_t Byte2 = value & 0x00FF0000;
|
|
uint32_t Byte3 = value & 0xFF000000;
|
|
return (Byte0 << 24) | (Byte1 << 8) | (Byte2 >> 8) | (Byte3 >> 24);
|
|
#endif
|
|
}
|
|
|
|
/// SwapByteOrder_64 - This function returns a byte-swapped representation of
|
|
/// the 64-bit argument.
|
|
inline uint64_t SwapByteOrder_64(uint64_t value) {
|
|
#if defined(__llvm__) || (LLVM_GNUC_PREREQ(4, 3, 0) && !defined(__ICC))
|
|
return __builtin_bswap64(value);
|
|
#elif defined(_MSC_VER) && !defined(_DEBUG)
|
|
return _byteswap_uint64(value);
|
|
#else
|
|
uint64_t Hi = SwapByteOrder_32(uint32_t(value));
|
|
uint32_t Lo = SwapByteOrder_32(uint32_t(value >> 32));
|
|
return (Hi << 32) | Lo;
|
|
#endif
|
|
}
|
|
|
|
inline unsigned char getSwappedBytes(unsigned char C) { return C; }
|
|
inline signed char getSwappedBytes(signed char C) { return C; }
|
|
inline char getSwappedBytes(char C) { return C; }
|
|
|
|
inline unsigned short getSwappedBytes(unsigned short C) { return SwapByteOrder_16(C); }
|
|
inline signed short getSwappedBytes( signed short C) { return SwapByteOrder_16(C); }
|
|
|
|
inline unsigned int getSwappedBytes(unsigned int C) { return SwapByteOrder_32(C); }
|
|
inline signed int getSwappedBytes( signed int C) { return SwapByteOrder_32(C); }
|
|
|
|
#if __LONG_MAX__ == __INT_MAX__
|
|
inline unsigned long getSwappedBytes(unsigned long C) { return SwapByteOrder_32(C); }
|
|
inline signed long getSwappedBytes( signed long C) { return SwapByteOrder_32(C); }
|
|
#elif __LONG_MAX__ == __LONG_LONG_MAX__
|
|
inline unsigned long getSwappedBytes(unsigned long C) { return SwapByteOrder_64(C); }
|
|
inline signed long getSwappedBytes( signed long C) { return SwapByteOrder_64(C); }
|
|
#else
|
|
#error "Unknown long size!"
|
|
#endif
|
|
|
|
inline unsigned long long getSwappedBytes(unsigned long long C) {
|
|
return SwapByteOrder_64(C);
|
|
}
|
|
inline signed long long getSwappedBytes(signed long long C) {
|
|
return SwapByteOrder_64(C);
|
|
}
|
|
|
|
inline float getSwappedBytes(float C) {
|
|
union {
|
|
uint32_t i;
|
|
float f;
|
|
} in, out;
|
|
in.f = C;
|
|
out.i = SwapByteOrder_32(in.i);
|
|
return out.f;
|
|
}
|
|
|
|
inline float getSwappedBytes(double C) {
|
|
union {
|
|
uint64_t i;
|
|
double d;
|
|
} in, out;
|
|
in.d = C;
|
|
out.i = SwapByteOrder_64(in.i);
|
|
return out.d;
|
|
}
|
|
|
|
template<typename T>
|
|
inline void swapByteOrder(T &Value) {
|
|
Value = getSwappedBytes(Value);
|
|
}
|
|
|
|
} // end namespace sys
|
|
} // end namespace llvm
|
|
|
|
#endif
|