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How do the likely/unlikely macros in the Linux kernel work and …
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 …
Can likely/unlikely macros be used in user-space code?
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 …
likely/unlikely equivalent for MSVC - Stack Overflow
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 …
Using Likely() / Unlikely() Preprocessor Macros in if-else if chain
Aug 19, 2016 · In general, GCC assumes that conditionals in if statements will be true - there are exceptions, but they are contextual.
c++ - What is the purpose of C++20's [[likely]] or [[unlikely ...
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 …
learning sample of likely () and unlikely () compiler hints
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 / …
c++ - Is there a compiler hint for GCC to force branch prediction to ...
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 …
c - likely (x) and __builtin_expect ( (x),1) - Stack Overflow
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 …
Multiple errors from C assert macro - Stack Overflow
Aug 14, 2017 · Understood, it's just particularly bothersome here as there are multiple layers. It'd be useful to be able to suppress the notes for just this macro. Especially as it then repeats …
performance - gcc likely unlikely macro usage - Stack Overflow
#define likely(x) __builtin_expect(x, 1) which I would personally consider to be bad form (since you're cryptically marking the unlikely path as likely for a performance gain). However, you still …
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