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comparison contrib/python-zstandard/zstd/common/compiler.h @ 40121:73fef626dae3

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zstandard: vendor python-zstandard 0.10.1 This was just released. The upstream source distribution from PyPI was extracted. Unwanted files were removed. The clang-format ignore list was updated to reflect the new source of files. setup.py was updated to pass a new argument to python-zstandard's function for returning an Extension instance. Upstream had to change to use relative paths because Python 3.7's packaging doesn't seem to like absolute paths when defining sources, includes, etc. The default relative path calculation is relative to setup_zstd.py which is different from the directory of Mercurial's setup.py. The project contains a vendored copy of zstandard 1.3.6. The old version was 1.3.4. The API should be backwards compatible and nothing in core should need adjusted. However, there is a new "chunker" API that we may find useful in places where we want to emit compressed chunks of a fixed size. There are a pair of bug fixes in 0.10.0 with regards to compressobj() and decompressobj() when block flushing is used. I actually found these bugs when introducing these APIs in Mercurial! But existing Mercurial code is not affected because we don't perform block flushing. # no-check-commit because 3rd party code has different style guidelines Differential Revision: https://phab.mercurial-scm.org/D4911
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 08 Oct 2018 16:27:40 -0700
parents b1fb341d8a61
children 675775c33ab6
comparison
equal deleted inserted replaced
40120:89742f1fa6cb 40121:73fef626dae3
75 75
76 /* Enable runtime BMI2 dispatch based on the CPU. 76 /* Enable runtime BMI2 dispatch based on the CPU.
77 * Enabled for clang & gcc >=4.8 on x86 when BMI2 isn't enabled by default. 77 * Enabled for clang & gcc >=4.8 on x86 when BMI2 isn't enabled by default.
78 */ 78 */
79 #ifndef DYNAMIC_BMI2 79 #ifndef DYNAMIC_BMI2
80 #if (defined(__clang__) && __has_attribute(__target__)) \ 80 #if ((defined(__clang__) && __has_attribute(__target__)) \
81 || (defined(__GNUC__) \ 81 || (defined(__GNUC__) \
82 && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8))) \ 82 && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))) \
83 && (defined(__x86_64__) || defined(_M_X86)) \ 83 && (defined(__x86_64__) || defined(_M_X86)) \
84 && !defined(__BMI2__) 84 && !defined(__BMI2__)
85 # define DYNAMIC_BMI2 1 85 # define DYNAMIC_BMI2 1
86 #else 86 #else
87 # define DYNAMIC_BMI2 0 87 # define DYNAMIC_BMI2 0
88 #endif 88 #endif
89 #endif 89 #endif
90 90
91 /* prefetch */ 91 /* prefetch
92 #if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_I86)) /* _mm_prefetch() is not defined outside of x86/x64 */ 92 * can be disabled, by declaring NO_PREFETCH macro
93 # include <mmintrin.h> /* https://msdn.microsoft.com/fr-fr/library/84szxsww(v=vs.90).aspx */ 93 * All prefetch invocations use a single default locality 2,
94 # define PREFETCH(ptr) _mm_prefetch((const char*)ptr, _MM_HINT_T0) 94 * generating instruction prefetcht1,
95 #elif defined(__GNUC__) 95 * which, according to Intel, means "load data into L2 cache".
96 # define PREFETCH(ptr) __builtin_prefetch(ptr, 0, 0) 96 * This is a good enough "middle ground" for the time being,
97 * though in theory, it would be better to specialize locality depending on data being prefetched.
98 * Tests could not determine any sensible difference based on locality value. */
99 #if defined(NO_PREFETCH)
100 # define PREFETCH(ptr) (void)(ptr) /* disabled */
97 #else 101 #else
98 # define PREFETCH(ptr) /* disabled */ 102 # if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_I86)) /* _mm_prefetch() is not defined outside of x86/x64 */
99 #endif 103 # include <mmintrin.h> /* https://msdn.microsoft.com/fr-fr/library/84szxsww(v=vs.90).aspx */
104 # define PREFETCH(ptr) _mm_prefetch((const char*)(ptr), _MM_HINT_T1)
105 # elif defined(__GNUC__) && ( (__GNUC__ >= 4) || ( (__GNUC__ == 3) && (__GNUC_MINOR__ >= 1) ) )
106 # define PREFETCH(ptr) __builtin_prefetch((ptr), 0 /* rw==read */, 2 /* locality */)
107 # else
108 # define PREFETCH(ptr) (void)(ptr) /* disabled */
109 # endif
110 #endif /* NO_PREFETCH */
111
112 #define CACHELINE_SIZE 64
113
114 #define PREFETCH_AREA(p, s) { \
115 const char* const _ptr = (const char*)(p); \
116 size_t const _size = (size_t)(s); \
117 size_t _pos; \
118 for (_pos=0; _pos<_size; _pos+=CACHELINE_SIZE) { \
119 PREFETCH(_ptr + _pos); \
120 } \
121 }
100 122
101 /* disable warnings */ 123 /* disable warnings */
102 #ifdef _MSC_VER /* Visual Studio */ 124 #ifdef _MSC_VER /* Visual Studio */
103 # include <intrin.h> /* For Visual 2005 */ 125 # include <intrin.h> /* For Visual 2005 */
104 # pragma warning(disable : 4100) /* disable: C4100: unreferenced formal parameter */ 126 # pragma warning(disable : 4100) /* disable: C4100: unreferenced formal parameter */