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Merge pull request #614 from Tilka/branch_prediction
[RFC] Common: add macros for assisting branch prediction
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commit
dee6f226a3
@ -15,7 +15,7 @@
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#define __has_feature(x) 0
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#endif
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// SVN version number
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// Git version number
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extern const char *scm_desc_str;
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extern const char *scm_branch_str;
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extern const char *scm_rev_str;
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@ -37,6 +37,28 @@ extern const char *netplay_dolphin_ver;
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#define UNUSED
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#endif
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#if defined(__GNUC__) || __clang__
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#define EXPECT(x, y) __builtin_expect(x, y)
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#define LIKELY(x) __builtin_expect(!!(x), 1)
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#define UNLIKELY(x) __builtin_expect(!!(x), 0)
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// Careful, wrong assumptions result in undefined behavior!
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#define UNREACHABLE __builtin_unreachable()
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// Careful, wrong assumptions result in undefined behavior!
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#define ASSUME(x) do { if (!x) __builtin_unreachable(); } while (0)
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#else
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#define EXPECT(x, y) (x)
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#define LIKELY(x) (x)
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#define UNLIKELY(x) (x)
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// Careful, wrong assumptions result in undefined behavior!
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#define UNREACHABLE ASSUME(0)
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#if defined(_MSC_VER)
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// Careful, wrong assumptions result in undefined behavior!
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#define ASSUME(x) __assume(x)
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#else
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#define ASSUME(x) do { void(x); } while (0)
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#endif
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#endif
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#define STACKALIGN
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#if __cplusplus >= 201103 || defined(_MSC_VER) || defined(__GXX_EXPERIMENTAL_CXX0X__)
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