rlm@1: /* CpuArch.h
rlm@1: 2008-08-05
rlm@1: Igor Pavlov
rlm@1: Public domain */
rlm@1: 
rlm@1: #ifndef __CPUARCH_H
rlm@1: #define __CPUARCH_H
rlm@1: 
rlm@1: /*
rlm@1: LITTLE_ENDIAN_UNALIGN means:
rlm@1:   1) CPU is LITTLE_ENDIAN
rlm@1:   2) it's allowed to make unaligned memory accesses
rlm@1: if LITTLE_ENDIAN_UNALIGN is not defined, it means that we don't know
rlm@1: about these properties of platform.
rlm@1: */
rlm@1: 
rlm@1: #if defined(_M_IX86) || defined(_M_X64) || defined(_M_AMD64) || defined(__i386__) || defined(__x86_64__)
rlm@1: #define LITTLE_ENDIAN_UNALIGN
rlm@1: #endif
rlm@1: 
rlm@1: #ifdef LITTLE_ENDIAN_UNALIGN
rlm@1: 
rlm@1: #define GetUi16(p) (*(const UInt16 *)(p))
rlm@1: #define GetUi32(p) (*(const UInt32 *)(p))
rlm@1: #define GetUi64(p) (*(const UInt64 *)(p))
rlm@1: #define SetUi32(p, d) *(UInt32 *)(p) = (d);
rlm@1: 
rlm@1: #else
rlm@1: 
rlm@1: #define GetUi16(p) (((const Byte *)(p))[0] | ((UInt16)((const Byte *)(p))[1] << 8))
rlm@1: 
rlm@1: #define GetUi32(p) ( \
rlm@1:              ((const Byte *)(p))[0]        | \
rlm@1:     ((UInt32)((const Byte *)(p))[1] <<  8) | \
rlm@1:     ((UInt32)((const Byte *)(p))[2] << 16) | \
rlm@1:     ((UInt32)((const Byte *)(p))[3] << 24))
rlm@1: 
rlm@1: #define GetUi64(p) (GetUi32(p) | ((UInt64)GetUi32(((const Byte *)(p)) + 4) << 32))
rlm@1: 
rlm@1: #define SetUi32(p, d) { UInt32 _x_ = (d); \
rlm@1:     ((Byte *)(p))[0] = (Byte)_x_; \
rlm@1:     ((Byte *)(p))[1] = (Byte)(_x_ >> 8); \
rlm@1:     ((Byte *)(p))[2] = (Byte)(_x_ >> 16); \
rlm@1:     ((Byte *)(p))[3] = (Byte)(_x_ >> 24); }
rlm@1: 
rlm@1: #endif
rlm@1: 
rlm@1: #if defined(LITTLE_ENDIAN_UNALIGN) && defined(_WIN64) && (_MSC_VER >= 1300)
rlm@1: 
rlm@1: #pragma intrinsic(_byteswap_ulong)
rlm@1: #pragma intrinsic(_byteswap_uint64)
rlm@1: #define GetBe32(p) _byteswap_ulong(*(const UInt32 *)(const Byte *)(p))
rlm@1: #define GetBe64(p) _byteswap_uint64(*(const UInt64 *)(const Byte *)(p))
rlm@1: 
rlm@1: #else
rlm@1: 
rlm@1: #define GetBe32(p) ( \
rlm@1:     ((UInt32)((const Byte *)(p))[0] << 24) | \
rlm@1:     ((UInt32)((const Byte *)(p))[1] << 16) | \
rlm@1:     ((UInt32)((const Byte *)(p))[2] <<  8) | \
rlm@1:              ((const Byte *)(p))[3] )
rlm@1: 
rlm@1: #define GetBe64(p) (((UInt64)GetBe32(p) << 32) | GetBe32(((const Byte *)(p)) + 4))
rlm@1: 
rlm@1: #endif
rlm@1: 
rlm@1: #define GetBe16(p) (((UInt16)((const Byte *)(p))[0] << 8) | ((const Byte *)(p))[1])
rlm@1: 
rlm@1: #endif