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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 …
Using Likely() / Unlikely() Preprocessor Macros in if-else if chain
Aug 19, 2016 · x(int, int*): testq %rsi, %rsi je .L3 # first branch: assumed unlikely movl $2, %eax testl %edi, %edi jne .L12 # second branch: assumed likely ret .L12: pushq %rbx movq %rsi, …
likely/unlikely equivalent for MSVC - Stack Overflow
GCC compiler supports __builtin_expect statement that is used to define likely and unlikely macros. eg. ...
Can likely/unlikely macros be used in user-space code?
Nov 3, 2009 · #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 …
c++ - What is the purpose of C++20's [[likely]] or [[unlikely ...
Apr 7, 2023 · 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. You can …
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 / …
Guidelines for using [[likely]] / [[unlikely]] attributes in c++20
Apr 28, 2023 · What is the general guideline for using the [[likely]] and [[unlikely]] attributes in c++20, for the cases where we have only two possible branches of code execution? Is it …
How to use C++20's likely/unlikely attribute in if-else statement
Aug 11, 2018 · This question is about C++20's [[likely]]/[[unlikely]] feature, not compiler-defined macros. This documents ( cppreference ) only gave an example on applying them to a switch …
c - Why doesn't likely and unlikely macros have any effect on …
Jun 1, 2019 · In the original link, they have tested it for X86 and the assembly output is different if likely(in the if condition in above code) is replaced with unlikely, which shows the optimisation …
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 …
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