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1 /* CpuArch.h
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2 2008-08-05
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3 Igor Pavlov
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4 Public domain */
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5
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6 #ifndef __CPUARCH_H
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7 #define __CPUARCH_H
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8
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9 /*
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10 LITTLE_ENDIAN_UNALIGN means:
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11 1) CPU is LITTLE_ENDIAN
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12 2) it's allowed to make unaligned memory accesses
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13 if LITTLE_ENDIAN_UNALIGN is not defined, it means that we don't know
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14 about these properties of platform.
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15 */
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16
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17 #if defined(_M_IX86) || defined(_M_X64) || defined(_M_AMD64) || defined(__i386__) || defined(__x86_64__)
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18 #define LITTLE_ENDIAN_UNALIGN
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19 #endif
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20
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21 #ifdef LITTLE_ENDIAN_UNALIGN
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22
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23 #define GetUi16(p) (*(const UInt16 *)(p))
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24 #define GetUi32(p) (*(const UInt32 *)(p))
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25 #define GetUi64(p) (*(const UInt64 *)(p))
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26 #define SetUi32(p, d) *(UInt32 *)(p) = (d);
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27
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28 #else
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29
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30 #define GetUi16(p) (((const Byte *)(p))[0] | ((UInt16)((const Byte *)(p))[1] << 8))
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31
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32 #define GetUi32(p) ( \
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33 ((const Byte *)(p))[0] | \
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34 ((UInt32)((const Byte *)(p))[1] << 8) | \
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35 ((UInt32)((const Byte *)(p))[2] << 16) | \
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36 ((UInt32)((const Byte *)(p))[3] << 24))
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37
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38 #define GetUi64(p) (GetUi32(p) | ((UInt64)GetUi32(((const Byte *)(p)) + 4) << 32))
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39
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40 #define SetUi32(p, d) { UInt32 _x_ = (d); \
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41 ((Byte *)(p))[0] = (Byte)_x_; \
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42 ((Byte *)(p))[1] = (Byte)(_x_ >> 8); \
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43 ((Byte *)(p))[2] = (Byte)(_x_ >> 16); \
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44 ((Byte *)(p))[3] = (Byte)(_x_ >> 24); }
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45
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46 #endif
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47
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48 #if defined(LITTLE_ENDIAN_UNALIGN) && defined(_WIN64) && (_MSC_VER >= 1300)
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49
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50 #pragma intrinsic(_byteswap_ulong)
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51 #pragma intrinsic(_byteswap_uint64)
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52 #define GetBe32(p) _byteswap_ulong(*(const UInt32 *)(const Byte *)(p))
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53 #define GetBe64(p) _byteswap_uint64(*(const UInt64 *)(const Byte *)(p))
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54
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55 #else
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56
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57 #define GetBe32(p) ( \
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58 ((UInt32)((const Byte *)(p))[0] << 24) | \
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59 ((UInt32)((const Byte *)(p))[1] << 16) | \
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60 ((UInt32)((const Byte *)(p))[2] << 8) | \
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61 ((const Byte *)(p))[3] )
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62
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63 #define GetBe64(p) (((UInt64)GetBe32(p) << 32) | GetBe32(((const Byte *)(p)) + 4))
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64
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65 #endif
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66
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67 #define GetBe16(p) (((UInt16)((const Byte *)(p))[0] << 8) | ((const Byte *)(p))[1])
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68
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69 #endif
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