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simpler ByteReverse

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This commit is contained in:
Nils Schneider 2011-09-30 16:23:26 +02:00
parent 6ccff2cbde
commit 452506fc41
1 changed files with 1 additions and 20 deletions
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21
src/util.h
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@ -726,29 +726,10 @@ inline bool AffinityBugWorkaround(void(*pfn)(void*))
return false; return false;
} }
template <class T> inline T rotlFixed(T x, unsigned int y)
{
assert(y < sizeof(T)*8);
return T((x<<y) | (x>>(sizeof(T)*8-y)));
}
template <class T> inline T rotrFixed(T x, unsigned int y)
{
assert(y < sizeof(T)*8);
return T((x>>y) | (x<<(sizeof(T)*8-y)));
}
inline uint32_t ByteReverse(uint32_t value) inline uint32_t ByteReverse(uint32_t value)
{ {
#if defined(__MWERKS__) && TARGET_CPU_PPC
return (uint32_t)__lwbrx(&value,0);
#elif _MSC_VER >= 1400 || (_MSC_VER >= 1300 && !defined(_DLL))
return _byteswap_ulong(value);
#else
// 6 instructions with rotate instruction, 8 without
value = ((value & 0xFF00FF00) >> 8) | ((value & 0x00FF00FF) << 8); value = ((value & 0xFF00FF00) >> 8) | ((value & 0x00FF00FF) << 8);
return rotlFixed(value, 16U); return (value<<16) | (value>>16);
#endif
} }
#endif #endif