| Nick Terrell | 565e925 | 2017-08-14 17:20:50 -0700 | [diff] [blame] | 1 | #ifndef ZSTD_COMPILER_H |
| 2 | #define ZSTD_COMPILER_H |
| 3 | |
| 4 | /*-******************************************************* |
| 5 | * Compiler specifics |
| 6 | *********************************************************/ |
| 7 | /* force inlining */ |
| 8 | #if defined (__GNUC__) || defined(__cplusplus) || defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */ |
| 9 | # define INLINE_KEYWORD inline |
| 10 | #else |
| 11 | # define INLINE_KEYWORD |
| 12 | #endif |
| 13 | |
| 14 | #if defined(__GNUC__) |
| 15 | # define FORCE_INLINE_ATTR __attribute__((always_inline)) |
| 16 | #elif defined(_MSC_VER) |
| 17 | # define FORCE_INLINE_ATTR __forceinline |
| 18 | #else |
| 19 | # define FORCE_INLINE_ATTR |
| 20 | #endif |
| 21 | |
| 22 | /** |
| 23 | * FORCE_INLINE_TEMPLATE is used to define C "templates", which take constant |
| 24 | * parameters. They must be inlined for the compiler to elimininate the constant |
| 25 | * branches. |
| 26 | */ |
| 27 | #define FORCE_INLINE_TEMPLATE static INLINE_KEYWORD FORCE_INLINE_ATTR |
| 28 | /** |
| 29 | * HINT_INLINE is used to help the compiler generate better code. It is *not* |
| 30 | * used for "templates", so it can be tweaked based on the compilers |
| 31 | * performance. |
| 32 | * |
| 33 | * gcc-4.8 and gcc-4.9 have been shown to benefit from leaving off the |
| 34 | * always_inline attribute. |
| 35 | * |
| 36 | * clang up to 5.0.0 (trunk) benefit tremendously from the always_inline |
| 37 | * attribute. |
| 38 | */ |
| 39 | #if !defined(__clang__) && defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 8 && __GNUC__ < 5 |
| 40 | # define HINT_INLINE static INLINE_KEYWORD |
| 41 | #else |
| 42 | # define HINT_INLINE static INLINE_KEYWORD FORCE_INLINE_ATTR |
| 43 | #endif |
| 44 | |
| 45 | /* force no inlining */ |
| 46 | #ifdef _MSC_VER |
| 47 | # define FORCE_NOINLINE static __declspec(noinline) |
| 48 | #else |
| 49 | # ifdef __GNUC__ |
| 50 | # define FORCE_NOINLINE static __attribute__((__noinline__)) |
| 51 | # else |
| 52 | # define FORCE_NOINLINE static |
| 53 | # endif |
| 54 | #endif |
| 55 | |
| 56 | /* prefetch */ |
| 57 | #if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_I86)) /* _mm_prefetch() is not defined outside of x86/x64 */ |
| 58 | # include <mmintrin.h> /* https://msdn.microsoft.com/fr-fr/library/84szxsww(v=vs.90).aspx */ |
| 59 | # define PREFETCH(ptr) _mm_prefetch((const char*)ptr, _MM_HINT_T0) |
| 60 | #elif defined(__GNUC__) |
| 61 | # define PREFETCH(ptr) __builtin_prefetch(ptr, 0, 0) |
| 62 | #else |
| 63 | # define PREFETCH(ptr) /* disabled */ |
| 64 | #endif |
| 65 | |
| 66 | /* disable warnings */ |
| 67 | #ifdef _MSC_VER /* Visual Studio */ |
| 68 | # include <intrin.h> /* For Visual 2005 */ |
| 69 | # pragma warning(disable : 4100) /* disable: C4100: unreferenced formal parameter */ |
| 70 | # pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ |
| 71 | # pragma warning(disable : 4204) /* disable: C4204: non-constant aggregate initializer */ |
| 72 | # pragma warning(disable : 4214) /* disable: C4214: non-int bitfields */ |
| 73 | # pragma warning(disable : 4324) /* disable: C4324: padded structure */ |
| 74 | #endif |
| 75 | |
| 76 | #endif /* ZSTD_COMPILER_H */ |