Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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/* RotateDefs.h -- Rotate functions
2013-11-12 : Igor Pavlov : Public domain */
#ifndef __ROTATE_DEFS_H
#define __ROTATE_DEFS_H
#ifdef _MSC_VER
#include <stdlib.h>
// #if (_MSC_VER >= 1200)
#pragma intrinsic(_rotl)
#pragma intrinsic(_rotr)
// #endif
#define rotlFixed(x, n) _rotl((x), (n))
#define rotrFixed(x, n) _rotr((x), (n))
#else
#define rotlFixed(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
#define rotrFixed(x, n) (((x) >> (n)) | ((x) << (32 - (n))))
#endif
#endif