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Kevin Newton
4f6a7e0fa9
This makes it so that you do not have to recurse when serializing and deserializing, making this safe for deep trees. https://github.com/ruby/prism/commit/ab92f0eb4b
27 lines
872 B
C
27 lines
872 B
C
/**
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* @file compiler/branch.h
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*/
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#ifndef PRISM_COMPILER_BRANCH_H
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#define PRISM_COMPILER_BRANCH_H
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/**
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* Branch prediction hints. These tell the compiler which side of a branch to
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* predicate the fast path through, so it can lay out instructions to favour
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* that side and steer the static branch predictor.
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*/
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#if defined(__GNUC__) || defined(__clang__)
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/** The compiler should predicate that this branch will be taken. */
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#define PRISM_LIKELY(x) __builtin_expect(!!(x), 1)
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/** The compiler should predicate that this branch will not be taken. */
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#define PRISM_UNLIKELY(x) __builtin_expect(!!(x), 0)
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#else
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/** Void because this platform does not support branch prediction hints. */
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#define PRISM_LIKELY(x) (x)
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/** Void because this platform does not support branch prediction hints. */
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#define PRISM_UNLIKELY(x) (x)
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#endif
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#endif
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