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50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/* RotateDefs.h -- Rotate functions
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2023-06-18 : Igor Pavlov : Public domain */
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#ifndef ZIP7_INC_ROTATE_DEFS_H
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#define ZIP7_INC_ROTATE_DEFS_H
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#ifdef _MSC_VER
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#include <stdlib.h>
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/* don't use _rotl with old MINGW. It can insert slow call to function. */
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/* #if (_MSC_VER >= 1200) */
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#pragma intrinsic(_rotl)
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#pragma intrinsic(_rotr)
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/* #endif */
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#define rotlFixed(x, n) _rotl((x), (n))
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#define rotrFixed(x, n) _rotr((x), (n))
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#if (_MSC_VER >= 1300)
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#define Z7_ROTL64(x, n) _rotl64((x), (n))
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#define Z7_ROTR64(x, n) _rotr64((x), (n))
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#else
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#define Z7_ROTL64(x, n) (((x) << (n)) | ((x) >> (64 - (n))))
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#define Z7_ROTR64(x, n) (((x) >> (n)) | ((x) << (64 - (n))))
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#endif
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#else
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/* new compilers can translate these macros to fast commands. */
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#if defined(__clang__) && (__clang_major__ >= 4) \
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|| defined(__GNUC__) && (__GNUC__ >= 5)
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/* GCC 4.9.0 and clang 3.5 can recognize more correct version: */
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#define rotlFixed(x, n) (((x) << (n)) | ((x) >> (-(n) & 31)))
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#define rotrFixed(x, n) (((x) >> (n)) | ((x) << (-(n) & 31)))
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#define Z7_ROTL64(x, n) (((x) << (n)) | ((x) >> (-(n) & 63)))
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#define Z7_ROTR64(x, n) (((x) >> (n)) | ((x) << (-(n) & 63)))
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#else
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/* for old GCC / clang: */
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#define rotlFixed(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
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#define rotrFixed(x, n) (((x) >> (n)) | ((x) << (32 - (n))))
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#define Z7_ROTL64(x, n) (((x) << (n)) | ((x) >> (64 - (n))))
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#define Z7_ROTR64(x, n) (((x) >> (n)) | ((x) << (64 - (n))))
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#endif
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#endif
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#endif
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