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93 lines
1.6 KiB
C
93 lines
1.6 KiB
C
/** @file bal_attributes.h
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*
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* @brief Compiler specific attribute macros.
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*/
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#ifndef BALLISTIC_ATTRIBUTES_H
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#define BALLISTIC_ATTRIBUTES_H
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/*!
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* BAL_HOT()/BAL_COLD()
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* Marks a function as hot or cold. Hot makes the compiller optimize it more
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* aggressively. Cold marks the function as rarely executed.
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*
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* Usage:
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* BAL_HOT bal_error_t emit_instruction(...);
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*/
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#if defined(__GNUC__) || defined(__clang__)
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#define BAL_HOT __attribute__((hot))
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#define BAL_COLD __attribute__((cold))
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#else
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#define BAL_HOT
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#define BAL_COLD
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#endif
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/*!
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* BAL_LIKELY(x)/BAL_UNLIKELY(x)
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* Hints to the CPU branch predictor. Should only be used in hot functions.
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*
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* Usage: if (BAL_UNLIKELY(ptr == NULL)) { ... }
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*/
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#if defined(__GNUC__) || defined(__clang__)
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#define BAL_LIKELY(x) __builtin_expect(!!(x), 1)
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#define BAL_UNLIKELY(x) __builtin_expect(!!(x), 0)
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#else
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#define BAL_LIKELY(x) (x)
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#define BAL_UNLIKELY(x) (x)
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#endif
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/*!
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* BAL_ALIGNED(x)
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* Aligns a variable or a structure to x bytes.
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*
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* Usage: BAL_ALIGNED(64) struct data { ... };
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*/
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#if defined(__GNUC__) || defined(__clang__)
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#define BAL_ALIGNED(x) __attribute__((aligned(x)))
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#elif defined(_MSC_VER)
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#define BAL_ALIGNED(x) __declspec(align(x))
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#else
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#define BAL_ALIGNED(x)
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#endif
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/*!
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* BAL_RESTRICT:
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* Tells the compiler that a pointer does not alias any other pointer in
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* current scope.
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*/
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#if defined(__GNUC__) || defined(__clang__)
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#define BAL_RESTRICT __restrict__
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#elif defined(_MSC_VER)
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#define BAL_RESTRICT __restrict
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#else
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#define BAL_RESTRICT
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#endif
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#endif /* BALLISTIC_ATTRIBUTES_H */
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/*** end of file ***/
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