For got to mention that we have macros for those few times where you cannot
avoid a branch conditional. They are the LIKELY() and UNLIKELY() macros
provided by the common.h header. When you know some conditional will nearly
always be true or false 99% of the time, that's when LIKELY() or UNLIKELY()
should be used.
They basically add a compiler hint that tells the compiler's branch prediction
optimizations which code path to optimize for so there's less likely a chance
of a branch prediction penalty. They're the next best thing.
if (UNLIKELY(x < 0)) {
/* ... rare ... */
} else {
/* ... common ... */
}
Cheers!
Sean
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