4 * The author dedicates this file to the public domain.
5 * You can do whatever you want with this file.
8 #ifndef _WIMLIB_COMPILER_GCC_H
9 #define _WIMLIB_COMPILER_GCC_H
12 # define WIMLIBAPI __declspec(dllexport)
14 # define WIMLIBAPI __attribute__((visibility("default")))
17 #define _packed_attribute __attribute__((packed))
18 #define _aligned_attribute(n) __attribute__((aligned(n)))
19 #define _may_alias_attribute __attribute__((may_alias))
20 #define likely(expr) __builtin_expect(!!(expr), 1)
21 #define unlikely(expr) __builtin_expect(!!(expr), 0)
22 #define prefetchr(addr) __builtin_prefetch((addr), 0)
23 #define prefetchw(addr) __builtin_prefetch((addr), 1)
24 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
25 # define _cold_attribute __attribute__((cold))
27 #define _malloc_attribute __attribute__((malloc))
28 #define inline inline __attribute__((always_inline))
29 #define noinline __attribute__((noinline))
31 /* Newer gcc supports __BYTE_ORDER__. Older gcc doesn't. */
33 # define CPU_IS_BIG_ENDIAN (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
34 #elif defined(HAVE_CONFIG_H)
36 # ifdef WORDS_BIGENDIAN
37 # define CPU_IS_BIG_ENDIAN 1
39 # define CPU_IS_BIG_ENDIAN 0
43 #if defined(__x86_64__) || defined(__i386__)
44 # define UNALIGNED_ACCESS_SPEED 3
45 #elif defined(__ARM_FEATURE_UNALIGNED) && (__ARM_FEATURE_UNALIGNED == 1)
46 # define UNALIGNED_ACCESS_SPEED 2
48 # define UNALIGNED_ACCESS_SPEED 0
51 #define typeof __typeof__
54 # define min(a, b) ({ typeof(a) _a = (a); typeof(b) _b = (b); \
55 (_a < _b) ? _a : _b; })
59 # define max(a, b) ({ typeof(a) _a = (a); typeof(b) _b = (b); \
60 (_a > _b) ? _a : _b; })
64 # define swap(a, b) ({ typeof(a) _a = (a); (a) = (b); (b) = _a; })
67 #if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
68 # define compiler_bswap32 __builtin_bswap32
69 # define compiler_bswap64 __builtin_bswap64
72 #if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)
73 # define compiler_bswap16 __builtin_bswap16
76 #define compiler_fls32(n) (31 - __builtin_clz(n))
77 #define compiler_fls64(n) (63 - __builtin_clzll(n))
78 #define compiler_ffs32(n) __builtin_ctz(n)
79 #define compiler_ffs64(n) __builtin_ctzll(n)
81 #endif /* _WIMLIB_COMPILER_GCC_H */