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The likely and unlikely macros or C++ [[likely]] / [[unlikely]] annotations can hint the compiler's branch layout to favour I-cache locality for the fast path, and minimize taken branches on the fast path. Also to hint the decision to make branchy vs. branchless asm when that's possible.

Sep 28, 2016 · #define likely(x) __builtin_expect(!!(x), 1) #define unlikely(x) __builtin_expect(!!(x), 0) The __builtin_expect macros are GCC specific macros that use the branch prediction; they tell the processor whether a condition is likely to be true, so that the processor can prefetch instructions on the correct "side" of the branch.

Aug 19, 2016 · In general, GCC assumes that conditionals in if statements will be true - there are exceptions, but they are contextual.

As of Visual Studio 2019 MSVC still doesn't support anything like this (even though it's the most popular builtin/intrinsic), but as Pauli Nieminen mentioned above C++20 has likely / unlikely attributes which can be used to create likely/unlikely macros and MSVC usually adds support for new C++ standards pretty quickly (unlike C) so I expect ...

Apr 29, 2010 · I think likely and unlikely are mostly obsolete. Very cheap CPUs (ARM Cortex A20 in the example) have branch predictors and there is no penalty regardless of jump is taken / jump is not taken. When you introduce likely/unlikely the results will be either the same or worse (because compiler has generated more instructions).

Jun 19, 2014 · I know the kernel uses the likely and unlikely macros prodigiously. The docs for the macros are located at Built-in Function: long __builtin_expect (long exp, long c). But they don't really discuss the details. How exactly does a compiler handle likely(x) and __builtin_expect((x),1)? Is it handled by the code generator or the optimizer?

Apr 7, 2023 · It's meant to let the compiler know which path is the "fast path", as in "more likely to happen". For example, imagine implementing vector::at. This function throws if the index is out of bounds. But you expect this situation to happen very rarely, most of the time you expect the users to access a valid element.

May 9, 2015 · #define likely(x) __builtin_expect (!!(x), 1) #define unlikely(x) __builtin_expect (!!(x), 0) just to ease the task. Mind that: this is non standard; a compiler/cpu branch predictor are likely more skilled than you in deciding such things so this could be a premature micro-optimization

May 28, 2014 · Or you could define the same macros as the kernel and use them for better readability. This is gcc builtin, so not portable of course. This suggests that clang also supports the builtin. Othrwise, you can use the above macros and conditionally define them like #define likely(x) (x) on compilers that don't support the builtin.

Aug 11, 2018 · Note: The use of the likely attribute is intended to allow implementations to optimize for the case where paths of execution including it are arbitrarily more likely than any alternative path of execution that does not include such an attribute on a statement or label. Note the word "allow" rather than "force", "require" or "mandate".