cne_branch_prediction.h File Reference

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Macros
#define	likely(x)   __builtin_expect(!!(x), 1)
#define	unlikely(x)   __builtin_expect(!!(x), 0)

Detailed Description

Branch Prediction Helpers in CNE

Definition in file cne_branch_prediction.h.

Macro Definition Documentation

likely

#define likely

(

x

)

__builtin_expect(!!(x), 1)

Check if a branch is likely to be taken.

This compiler builtin allows the developer to indicate if a branch is likely to be taken. Example:

if (likely(x > 1)) do_stuff();

Examples

examples/cnet-graph/cnet-graph.c, examples/cnet-quic/cnet-quic.c, and examples/l3fwd-graph/fwd.c.

Definition at line 24 of file cne_branch_prediction.h.

unlikely

#define unlikely

(

x

)

__builtin_expect(!!(x), 0)

Check if a branch is unlikely to be taken.

This compiler builtin allows the developer to indicate if a branch is unlikely to be taken. Example:

if (unlikely(x < 1)) do_stuff();

Definition at line 38 of file cne_branch_prediction.h.