xref: /aosp_15_r20/external/lzma/C/RotateDefs.h (revision f6dc9357d832569d4d1f5d24eacdb3935a1ae8e6)
1 /* RotateDefs.h -- Rotate functions
2 2023-06-18 : Igor Pavlov : Public domain */
3 
4 #ifndef ZIP7_INC_ROTATE_DEFS_H
5 #define ZIP7_INC_ROTATE_DEFS_H
6 
7 #ifdef _MSC_VER
8 
9 #include <stdlib.h>
10 
11 /* don't use _rotl with old MINGW. It can insert slow call to function. */
12 
13 /* #if (_MSC_VER >= 1200) */
14 #pragma intrinsic(_rotl)
15 #pragma intrinsic(_rotr)
16 /* #endif */
17 
18 #define rotlFixed(x, n) _rotl((x), (n))
19 #define rotrFixed(x, n) _rotr((x), (n))
20 
21 #if (_MSC_VER >= 1300)
22 #define Z7_ROTL64(x, n) _rotl64((x), (n))
23 #define Z7_ROTR64(x, n) _rotr64((x), (n))
24 #else
25 #define Z7_ROTL64(x, n) (((x) << (n)) | ((x) >> (64 - (n))))
26 #define Z7_ROTR64(x, n) (((x) >> (n)) | ((x) << (64 - (n))))
27 #endif
28 
29 #else
30 
31 /* new compilers can translate these macros to fast commands. */
32 
33 #if defined(__clang__) && (__clang_major__ >= 4) \
34   || defined(__GNUC__) && (__GNUC__ >= 5)
35 /* GCC 4.9.0 and clang 3.5 can recognize more correct version: */
36 #define rotlFixed(x, n) (((x) << (n)) | ((x) >> (-(n) & 31)))
37 #define rotrFixed(x, n) (((x) >> (n)) | ((x) << (-(n) & 31)))
38 #define Z7_ROTL64(x, n) (((x) << (n)) | ((x) >> (-(n) & 63)))
39 #define Z7_ROTR64(x, n) (((x) >> (n)) | ((x) << (-(n) & 63)))
40 #else
41 /* for old GCC / clang: */
42 #define rotlFixed(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
43 #define rotrFixed(x, n) (((x) >> (n)) | ((x) << (32 - (n))))
44 #define Z7_ROTL64(x, n) (((x) << (n)) | ((x) >> (64 - (n))))
45 #define Z7_ROTR64(x, n) (((x) >> (n)) | ((x) << (64 - (n))))
46 #endif
47 
48 #endif
49 
50 #endif
51