RotateDefs.h

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/* RotateDefs.h -- Rotate functions
2023-06-18 : Igor Pavlov : Public domain */
 
#ifndef ZIP7_INC_ROTATE_DEFS_H
#define ZIP7_INC_ROTATE_DEFS_H
 
#ifdef _MSC_VER
 
#include <stdlib.h>
 
/* don't use _rotl with old MINGW. It can insert slow call to function. */
 
/* #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))
 
#if (_MSC_VER >= 1300)
#define Z7_ROTL64(x, n) _rotl64((x), (n))
#define Z7_ROTR64(x, n) _rotr64((x), (n))
#else
#define Z7_ROTL64(x, n) (((x) << (n)) | ((x) >> (64 - (n))))
#define Z7_ROTR64(x, n) (((x) >> (n)) | ((x) << (64 - (n))))
#endif
 
#else
 
/* new compilers can translate these macros to fast commands. */
 
#if defined(__clang__) && (__clang_major__ >= 4) \
  || defined(__GNUC__) && (__GNUC__ >= 5)
/* GCC 4.9.0 and clang 3.5 can recognize more correct version: */
#define rotlFixed(x, n) (((x) << (n)) | ((x) >> (-(n) & 31)))
#define rotrFixed(x, n) (((x) >> (n)) | ((x) << (-(n) & 31)))
#define Z7_ROTL64(x, n) (((x) << (n)) | ((x) >> (-(n) & 63)))
#define Z7_ROTR64(x, n) (((x) >> (n)) | ((x) << (-(n) & 63)))
#else
/* for old GCC / clang: */
#define rotlFixed(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
#define rotrFixed(x, n) (((x) >> (n)) | ((x) << (32 - (n))))
#define Z7_ROTL64(x, n) (((x) << (n)) | ((x) >> (64 - (n))))
#define Z7_ROTR64(x, n) (((x) >> (n)) | ((x) << (64 - (n))))
#endif
 
#endif
 
#endif